TransientMultiApp

MultiApp for performing coupled simulations with the master and sub-application both progressing in time.

Overview

The TransientMultiApp is designed to perform simulations with sub-applications that progress in time with the main application. A TransientMultiApp requires that your "sub-apps" use an Executioner derived from Transient.

A TransientMultiApp MultiApp objects will be taken into account during time step selection inside the "main" Transient executioner. By default, the minimum time step over the main and all sub-apps is utilized. The ability to perform sub-cycling, which allows the sub-applications to perform multiple time steps per execution may be enabled using the "sub_cycling" parameter. When performing sub-cycling, transferred auxiliary variables on sub-apps are allowed to be interpolated between the start time and the end time of the main app with "interpolate_transfers" parameter.

Time state of TransientMultiApps

TransientMultiApps are "auto-advanced" by default whenever we are not doing Picard iterations between the main and sub-application. This means that the Transient::endStep and Transient::postStep methods of the sub-applications executioner are called, regardless of whether the sub-application solve fails or not. The endStep method increments the time and also performs EXEC_TIMESTEP_END output. When sub-applications are auto-advanced, their endStep call happens before the main application's endStep call. This has the important benefit that when main application output occurs, the sub-application's and main application's time states are the same, which enables MOOSE restart/recovery capability.

Handing sub-application solve failures

As noted above, the default behavior when running TransientMultiApps is that their time state is incremented, e.g. they are "auto-advanced", regardless of whether their solve is actually successful. This is undesirable behavior, but we believe that the syncing of main and sub-application states, under normal operation, to enable correct checkpoint output is a good trade. Given the constraints of the elected design, there are still multiple ways to turn a failed sub-application solve from a warning into an exception that will force corrective behavior in either the sub- or main-application:

The user can set auto_advance = false in the Executioner block of the main application . This will cause the main application to immediately cut its time-step when the sub-application fails. However**, setting this parameter to false also eliminates the possibility of doing restart/recover because the main and sub will be out of sync if/when checkpoint output occurs.
The user can set catch_up = true in the TransientMultiApp block. This will cause the sub-application to try and catch up to the main application after a sub-app failed solve. If catch-up is unsuccessful, then MOOSE registers this as a true failure of the solve, and the main dt will then get cut. This option has the advantage of keeping the main and sub transient states in sync, enabling accurate restart/recover data.

In general, if the user wants sub-application failed solves to be treated as exceptions, we recommend that option 2 over option 1.

Example Input File Syntax

The following input file shows the creation of a TransientMultiApp object with the time step size being governed by the main application.

[MultiApps]
  [sub_app]
    type = TransientMultiApp
    app_type = MooseTestApp
    input_files = 'dt_from_master_sub.i'
    positions = '0   0   0
                 0.5 0.5 0
                 0.6 0.6 0
                 0.7 0.7 0'
  []
[]

Input Parameters

input_filesThe input file for each App. If this parameter only contains one input file it will be used for all of the Apps. When using 'positions_from_file' it is also admissable to provide one input_file per file.
C++ Type:std::vector<FileName>
Options:
Description:The input file for each App. If this parameter only contains one input file it will be used for all of the Apps. When using 'positions_from_file' it is also admissable to provide one input_file per file.

Required Parameters

app_typeThe type of application to build (applications not registered can be loaded with dynamic libraries. Master application type will be used if not provided.
C++ Type:MooseEnum
Options:CombinedApp, CombinedTestApp
Description:The type of application to build (applications not registered can be loaded with dynamic libraries. Master application type will be used if not provided.
bounding_box_inflation0.01Relative amount to 'inflate' the bounding box of this MultiApp.
Default:0.01
C++ Type:double
Options:
Description:Relative amount to 'inflate' the bounding box of this MultiApp.
bounding_box_padding0 0 0Additional padding added to the dimensions of the bounding box. The values are added to the x, y and z dimension respectively.
Default:0 0 0
C++ Type:libMesh::Point
Options:
Description:Additional padding added to the dimensions of the bounding box. The values are added to the x, y and z dimension respectively.
catch_upFalseIf true this will allow failed solves to attempt to 'catch up' using smaller timesteps.
Default:False
C++ Type:bool
Options:
Description:If true this will allow failed solves to attempt to 'catch up' using smaller timesteps.
cli_argsAdditional command line arguments to pass to the sub apps. If one set is provided the arguments are applied to all, otherwise there must be a set for each sub app.
C++ Type:std::vector<std::string>
Options:
Description:Additional command line arguments to pass to the sub apps. If one set is provided the arguments are applied to all, otherwise there must be a set for each sub app.
cli_args_filesFile names that should be looked in for additional command line arguments to pass to the sub apps. Each line of a file is set to each sub app. If only one line is provided, it will be applied to all sub apps.
C++ Type:std::vector<FileName>
Options:
Description:File names that should be looked in for additional command line arguments to pass to the sub apps. Each line of a file is set to each sub app. If only one line is provided, it will be applied to all sub apps.
clone_master_meshFalseTrue to clone master mesh and use it for this MultiApp.
Default:False
C++ Type:bool
Options:
Description:True to clone master mesh and use it for this MultiApp.
detect_steady_stateFalseIf true then while sub_cycling a steady state check will be done. In this mode output will only be done once the MultiApp reaches the target time or steady state is reached
Default:False
C++ Type:bool
Options:
Description:If true then while sub_cycling a steady state check will be done. In this mode output will only be done once the MultiApp reaches the target time or steady state is reached
execute_onTIMESTEP_BEGINThe list of flag(s) indicating when this object should be executed, the available options include NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, FINAL, CUSTOM.
Default:TIMESTEP_BEGIN
C++ Type:ExecFlagEnum
Options:NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, FINAL, CUSTOM
Description:The list of flag(s) indicating when this object should be executed, the available options include NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, FINAL, CUSTOM.
global_time_offset0The time offset relative to the master application for the purpose of starting a subapp at different time from the master application. The global time will be ahead by the offset specified here.
Default:0
C++ Type:double
Options:
Description:The time offset relative to the master application for the purpose of starting a subapp at different time from the master application. The global time will be ahead by the offset specified here.
interpolate_transfersFalseOnly valid when sub_cycling. This allows transferred values to be interpolated over the time frame the MultiApp is executing over when sub_cycling
Default:False
C++ Type:bool
Options:
Description:Only valid when sub_cycling. This allows transferred values to be interpolated over the time frame the MultiApp is executing over when sub_cycling
keep_solution_during_restoreFalseThis is useful when doing MultiApp coupling iterations. It takes the final solution from the previous coupling iterationand re-uses it as the initial guess for the next coupling iteration
Default:False
C++ Type:bool
Options:
Description:This is useful when doing MultiApp coupling iterations. It takes the final solution from the previous coupling iterationand re-uses it as the initial guess for the next coupling iteration
library_nameThe file name of the library (*.la file) that will be dynamically loaded.
C++ Type:std::string
Options:
Description:The file name of the library (*.la file) that will be dynamically loaded.
library_pathPath to search for dynamic libraries (please avoid committing absolute paths in addition to MOOSE_LIBRARY_PATH)
C++ Type:std::string
Options:
Description:Path to search for dynamic libraries (please avoid committing absolute paths in addition to MOOSE_LIBRARY_PATH)
max_catch_up_steps2Maximum number of steps to allow an app to take when trying to catch back up after a failed solve.
Default:2
C++ Type:double
Options:
Description:Maximum number of steps to allow an app to take when trying to catch back up after a failed solve.
max_failures0Maximum number of solve failures tolerated while sub_cycling.
Default:0
C++ Type:unsigned int
Options:
Description:Maximum number of solve failures tolerated while sub_cycling.
max_procs_per_app4294967295Maximum number of processors to give to each App in this MultiApp. Useful for restricting small solves to just a few procs so they don't get spread out
Default:4294967295
C++ Type:unsigned int
Options:
Description:Maximum number of processors to give to each App in this MultiApp. Useful for restricting small solves to just a few procs so they don't get spread out
min_procs_per_app1Minimum number of processors to give to each App in this MultiApp. Useful for larger, distributed mesh solves.
Default:1
C++ Type:unsigned int
Options:
Description:Minimum number of processors to give to each App in this MultiApp. Useful for larger, distributed mesh solves.
move_appsApps, designated by their 'numbers' starting with 0 corresponding to the order of the App positions, to be moved at move_time to move_positions
C++ Type:std::vector<unsigned int>
Options:
Description:Apps, designated by their 'numbers' starting with 0 corresponding to the order of the App positions, to be moved at move_time to move_positions
move_positionsThe positions corresponding to each move_app.
C++ Type:std::vector<libMesh::Point>
Options:
Description:The positions corresponding to each move_app.
move_time1.79769e+308The time at which Apps designated by move_apps are moved to move_positions.
Default:1.79769e+308
C++ Type:double
Options:
Description:The time at which Apps designated by move_apps are moved to move_positions.
output_in_positionFalseIf true this will cause the output from the MultiApp to be 'moved' by its position vector
Default:False
C++ Type:bool
Options:
Description:If true this will cause the output from the MultiApp to be 'moved' by its position vector
output_sub_cyclesFalseIf true then every sub-cycle will be output.
Default:False
C++ Type:bool
Options:
Description:If true then every sub-cycle will be output.
positionsThe positions of the App locations. Each set of 3 values will represent a Point. This and 'positions_file' cannot be both supplied. If this and 'positions_file' are not supplied, a single position (0,0,0) will be used
C++ Type:std::vector<libMesh::Point>
Options:
Description:The positions of the App locations. Each set of 3 values will represent a Point. This and 'positions_file' cannot be both supplied. If this and 'positions_file' are not supplied, a single position (0,0,0) will be used
positions_fileA filename that should be looked in for positions. Each set of 3 values in that file will represent a Point. This and 'positions' cannot be both supplied
C++ Type:std::vector<FileName>
Options:
Description:A filename that should be looked in for positions. Each set of 3 values in that file will represent a Point. This and 'positions' cannot be both supplied
print_sub_cyclesTrueToggle the display of sub-cycles on the screen.
Default:True
C++ Type:bool
Options:
Description:Toggle the display of sub-cycles on the screen.
relaxation_factor1Fraction of newly computed value to keep.Set between 0 and 2.
Default:1
C++ Type:double
Options:
Description:Fraction of newly computed value to keep.Set between 0 and 2.
reset_appsThe Apps that will be reset when 'reset_time' is hit. These are the App 'numbers' starting with 0 corresponding to the order of the App positions. Resetting an App means that it is destroyed and recreated, possibly modeling the insertion of 'new' material for that app.
C++ Type:std::vector<unsigned int>
Options:
Description:The Apps that will be reset when 'reset_time' is hit. These are the App 'numbers' starting with 0 corresponding to the order of the App positions. Resetting an App means that it is destroyed and recreated, possibly modeling the insertion of 'new' material for that app.
reset_time1.79769e+308The time at which to reset Apps given by the 'reset_apps' parameter. Resetting an App means that it is destroyed and recreated, possibly modeling the insertion of 'new' material for that app.
Default:1.79769e+308
C++ Type:double
Options:
Description:The time at which to reset Apps given by the 'reset_apps' parameter. Resetting an App means that it is destroyed and recreated, possibly modeling the insertion of 'new' material for that app.
steady_state_tol1e-08The relative difference between the new solution and the old solution that will be considered to be at steady state
Default:1e-08
C++ Type:double
Options:
Description:The relative difference between the new solution and the old solution that will be considered to be at steady state
sub_cyclingFalseSet to true to allow this MultiApp to take smaller timesteps than the rest of the simulation. More than one timestep will be performed for each 'master' timestep
Default:False
C++ Type:bool
Options:
Description:Set to true to allow this MultiApp to take smaller timesteps than the rest of the simulation. More than one timestep will be performed for each 'master' timestep
tolerate_failureFalseIf true this MultiApp won't participate in dt decisions and will always be fast-forwarded to the current time.
Default:False
C++ Type:bool
Options:
Description:If true this MultiApp won't participate in dt decisions and will always be fast-forwarded to the current time.
transformed_postprocessorsList of subapp postprocessors to use coupling algorithm on during Multiapp coupling iterations
C++ Type:std::vector<PostprocessorName>
Options:
Description:List of subapp postprocessors to use coupling algorithm on during Multiapp coupling iterations
transformed_variablesList of subapp variables to use coupling algorithm on during Multiapp coupling iterations
C++ Type:std::vector<std::string>
Options:
Description:List of subapp variables to use coupling algorithm on during Multiapp coupling iterations

Optional Parameters

control_tagsAdds user-defined labels for accessing object parameters via control logic.
C++ Type:std::vector<std::string>
Options:
Description:Adds user-defined labels for accessing object parameters via control logic.
enableTrueSet the enabled status of the MooseObject.
Default:True
C++ Type:bool
Options:
Description:Set the enabled status of the MooseObject.
implicitTrueDetermines whether this object is calculated using an implicit or explicit form
Default:True
C++ Type:bool
Options:
Description:Determines whether this object is calculated using an implicit or explicit form
use_displaced_meshFalseWhether or not this object should use the displaced mesh for computation. Note that in the case this is true but no displacements are provided in the Mesh block the undisplaced mesh will still be used.
Default:False
C++ Type:bool
Options:
Description:Whether or not this object should use the displaced mesh for computation. Note that in the case this is true but no displacements are provided in the Mesh block the undisplaced mesh will still be used.

Advanced Parameters

Input Files

(modules/porous_flow/examples/multiapp_fracture_flow/fracture_diffusion/matrix_app_nonconforming.i)
(test/tests/transfers/multiapp_nearest_node_transfer/fromsub_displaced_master.i)
(modules/stochastic_tools/test/tests/transfers/sampler_postprocessor/errors/wrong_multi_app.i)
(test/tests/multiapps/output_in_position/multilevel_master.i)
(test/tests/controls/time_periods/transfers/master.i)
(test/tests/multiapps/sub_cycling/master_iteration_adaptive.i)
(test/tests/outputs/perf_graph/multi_app/master.i)
(test/tests/multiapps/move/multilevel_master.i)
(modules/functional_expansion_tools/test/tests/standard_use/multiapp_print_coefficients.i)
(test/tests/transfers/multiapp_scalar_to_auxscalar_transfer/to_sub/master.i)
(test/tests/parser/cli_multiapp_all/dt_from_master.i)
(python/chigger/tests/input/multiapps.i)
(test/tests/multiapps/move/multilevel_sub.i)
(test/tests/restart/restart_transient_from_steady/restart_trans_with_sub.i)
(modules/combined/examples/geochem-porous_flow/geotes_2D/porous_flow.i)
(test/tests/controls/time_periods/multiapps/master.i)
(test/tests/outputs/transferred_scalar_variable/transferred_scalar_variable.i)
(test/tests/parser/cli_multiapp_group/dt_from_master.i)
(test/tests/transfers/multiapp_nearest_node_transfer/boundary_tosub_master.i)
(test/tests/transfers/multiapp_variable_value_sample_transfer/master.i)
(test/tests/transfers/multiapp_vector_pp_transfer/master.i)
(test/tests/transfers/multiapp_variable_value_sample_transfer/pp_master.i)
(tutorials/tutorial02_multiapps/step01_multiapps/05_master_parallel.i)
(test/tests/transfers/reporter_transfer/clone_type.i)
(tutorials/tutorial02_multiapps/step01_multiapps/07_master_multilevel.i)
(test/tests/transfers/transfer_interpolation/master.i)
(test/tests/multiapps/sub_cycling_failure/master_gold.i)
(test/tests/multiapps/move/master.i)
(test/tests/multiapps/multilevel/dt_from_sub_sub.i)
(modules/functional_expansion_tools/examples/3D_volumetric_cylindrical/main.i)
(test/tests/multiapps/picard_multilevel/picard_sub.i)
(test/tests/transfers/multiapp_userobject_transfer/restricted_node_master.i)
(test/tests/transfers/multiapp_nearest_node_transfer/boundary_tomaster_master.i)
(modules/porous_flow/examples/multiapp_fracture_flow/single_fracture_heat_transfer/matrix_app.i)
(tutorials/tutorial02_multiapps/step02_transfers/03_master_uot.i)
(test/tests/outputs/console/multiapp/picard_master_both.i)
(test/tests/multiapps/auto_diff_auto_scaling/main.i)
(test/tests/transfers/multiapp_postprocessor_to_scalar/master2_wrong_order.i)
(test/tests/transfers/multiapp_mesh_function_transfer/tosub_target_displaced.i)
(test/tests/multiapps/grid-sequencing/vi-coarse.i)
(test/tests/transfers/multiapp_postprocessor_transfer/master.i)
(modules/functional_expansion_tools/examples/2D_volumetric_Cartesian/main.i)
(modules/functional_expansion_tools/test/tests/standard_use/multiapp_different_physical_boundaries.i)
(modules/functional_expansion_tools/test/tests/standard_use/volume_coupling_custom_norm.i)
(modules/functional_expansion_tools/test/tests/errors/multiapp_bad_user_object.i)
(test/tests/multiapps/output_in_position/master.i)
(test/tests/multiapps/initial_intactive/master.i)
(test/tests/multiapps/reset/master.i)
(tutorials/tutorial02_multiapps/step03_coupling/02_master_picard.i)
(test/tests/multiapps/secant/transient_main.i)
(test/tests/transfers/multiapp_variable_value_sample_transfer/master_fv.i)
(test/tests/transfers/get_transfers_from_feproblem/master.i)
(modules/functional_expansion_tools/test/tests/errors/multiapp_missing_local_object.i)
(test/tests/transfers/multiapp_postprocessor_interpolation_transfer/multilevel_sub.i)
(test/tests/multiapps/restart/master.i)
(test/tests/multiapps/picard_multilevel/2level_picard/sub_level1.i)
(test/tests/multiapps/grid-sequencing/vi-fine.i)
(test/tests/multiapps/time_offset/master.i)
(test/tests/multiapps/petsc_options/master.i)
(test/tests/multiapps/sub_cycling_failure/master.i)
(modules/stochastic_tools/test/tests/transfers/errors/master_multiapp_type_error.i)
(test/tests/multiapps/picard_sub_cycling/picard_master.i)
(test/tests/multiapps/sub_cycling/main_negative.i)
(test/tests/transfers/multiapp_nearest_node_transfer/tosub_displaced_master.i)
(tutorials/tutorial02_multiapps/step02_transfers/01_master_meshfunction.i)
(modules/combined/examples/geochem-porous_flow/forge/porous_flow.i)
(test/tests/multiapps/loose_couple_time_adapt/end.i)
(test/tests/transfers/multiapp_mesh_function_transfer/missing_master.i)
(modules/functional_expansion_tools/test/tests/errors/multiapp_incompatible_orders.i)
(python/chigger/tests/simple/multiapps.i)
(test/tests/multiapps/relaxation/picard_relaxed_array_master.i)
(test/tests/multiapps/check_error/check_error.i)
(test/tests/transfers/multiapp_interpolation_transfer/tosub_master.i)
(test/tests/multiapps/multilevel/dt_from_master_sub.i)
(modules/level_set/test/tests/transfers/markers/multi_level/master.i)
(test/tests/multiapps/restart_multilevel/master2.i)
(modules/porous_flow/examples/multiapp_fracture_flow/3dFracture/matrix_app.i)
(test/tests/transfers/transfer_on_final/master.i)
(test/tests/multiapps/picard/picard_rel_tol_master.i)
(test/tests/multiapps/transient_multiapp/dt_from_multi.i)
(test/tests/multiapps/picard/picard_adaptive_master.i)
(modules/external_petsc_solver/test/tests/external_petsc_problem/petsc_transient_as_master.i)
(test/tests/transfers/reporter_transfer/main.i)
(test/tests/multiapps/loose_couple_time_adapt/begin.i)
(test/tests/multiapps/multiple_position_files/multiple_position_files.i)
(tutorials/darcy_thermo_mech/step10_multiapps/problems/step10.i)
(test/tests/outputs/console/multiapp/picard_master.i)
(test/tests/multiapps/positions_from_file/dt_from_multi.i)
(modules/functional_expansion_tools/test/tests/standard_use/volume_coupled.i)
(test/tests/multiapps/sub_cycling_failure/failure_with_max_procs_set.i)
(test/tests/transfers/multiapp_postprocessor_interpolation_transfer/radial_master.i)
(modules/functional_expansion_tools/examples/3D_volumetric_cylindrical_subapp_mesh_refine/main.i)
(tutorials/tutorial02_multiapps/step02_transfers/02_master_nearestnode.i)
(test/tests/restart/restart_transient_from_transient/restart_trans_with_2subs.i)
(test/tests/multiapps/restart/master2.i)
(test/tests/multiapps/transient_multiapp/dt_from_master.i)
(test/tests/parser/cli_multiapp_single/dt_from_master.i)
(test/tests/multiapps/sub_cycling/master_short.i)
(modules/functional_expansion_tools/examples/2D_interface_different_submesh/main.i)
(modules/combined/examples/geochem-porous_flow/geotes_2D/exchanger_un_quartz.i)
(test/tests/multiapps/cliargs_from_file/cliargs_master_inline.i)
(test/tests/transfers/multiapp_userobject_transfer/tosub_displaced_master.i)
(test/tests/transfers/transfer_with_reset/master.i)
(test/tests/transfers/multiapp_conservative_transfer/master_userobject.i)
(test/tests/multiapps/picard_multilevel/multilevel_dt_rejection/picard_sub.i)
(modules/external_petsc_solver/test/tests/external_petsc_problem/moose_as_master.i)
(test/tests/transfers/multiapp_nearest_node_transfer/fromsub_master.i)
(test/tests/multiapps/multilevel/dt_from_sub_master.i)
(test/tests/transfers/multiapp_mesh_function_transfer/tosub_source_displaced.i)
(modules/functional_expansion_tools/test/tests/errors/multiapp_bad_function_series.i)
(test/tests/multiapps/stateful_material_sub_cycling/material_sub_app_test_master.i)
(tutorials/tutorial02_multiapps/step01_multiapps/01_master.i)
(test/tests/multiapps/picard_multilevel/picard_master.i)
(test/tests/multiapps/catch_up/master.i)
(test/tests/transfers/multiapp_nearest_node_transfer/two_way_many_apps_master.i)
(test/tests/transfers/multiapp_projection_transfer/fixed_meshes_master.i)
(modules/functional_expansion_tools/examples/3D_volumetric_Cartesian_direct/main.i)
(test/tests/multiapps/sub_cycling/master_sub_output.i)
(test/tests/transfers/multiapp_variable_value_sample_transfer/master_quad.i)
(test/tests/transfers/reporter_transfer/clone.i)
(test/tests/outputs/output_if_base_contains/dt_from_master_master.i)
(test/tests/transfers/multiapp_postprocessor_transfer/master_from_multiapp.i)
(test/tests/multiapps/reset/multilevel_sub.i)
(test/tests/transfers/multiapp_mesh_function_transfer/fromsub_source_displaced.i)
(test/tests/transfers/multiapp_postprocessor_interpolation_transfer/multilevel_master.i)
(test/tests/transfers/multiapp_userobject_transfer/master.i)
(modules/porous_flow/examples/multiapp_fracture_flow/diffusion_multiapp/fracture_app.i)
(modules/misc/test/tests/dynamic_loading/dynamic_load_multiapp/misc_master.i)
(modules/misc/test/tests/dynamic_loading/dynamic_load_multiapp/misc_master_bad.i)
(modules/external_petsc_solver/test/tests/partition/moose_as_master.i)
(test/tests/transfers/multiapp_mesh_function_transfer/fromsub.i)
(test/tests/multiapps/relaxation/bad_relax_factor_master.i)
(test/tests/multiapps/sub_cycling/master.i)
(tutorials/tutorial02_multiapps/step03_coupling/03_master_subcycling_picard.i)
(modules/combined/examples/geochem-porous_flow/geotes_2D/exchanger.i)
(modules/stochastic_tools/test/tests/transfers/sampler_transfer/errors/master_multiapp_type_error.i)
(modules/combined/examples/geochem-porous_flow/geotes_weber_tensleep/exchanger.i)
(modules/combined/test/tests/beam_eigenstrain_transfer/master_uo_transfer.i)
(test/tests/transfers/multiapp_userobject_transfer/restricted_elem_master.i)
(test/tests/multiapps/picard/function_dt_master.i)
(test/tests/transfers/multiapp_postprocessor_interpolation_transfer/master_quad.i)
(test/tests/transfers/multiapp_postprocessor_interpolation_transfer/master2_quad.i)
(test/tests/multiapps/restart_multilevel/master.i)
(tutorials/tutorial02_multiapps/step01_multiapps/04_master_multiple.i)
(test/tests/multiapps/restart_subapp_ic/master.i)
(tutorials/tutorial02_multiapps/step01_multiapps/07_sub_multilevel.i)
(test/tests/multiapps/steffensen_postprocessor/transient_main.i)
(test/tests/transfers/multiapp_userobject_transfer/tosub_master.i)
(test/tests/transfers/multiapp_nearest_node_transfer/tosub_master.i)
(modules/functional_expansion_tools/examples/3D_volumetric_Cartesian_different_submesh/main.i)
(test/tests/controls/pid_control/pid_pp_control.i)
(test/tests/multiapps/grid-sequencing/fine.i)
(test/tests/transfers/multiapp_postprocessor_interpolation_transfer/master.i)
(test/tests/transfers/multiapp_userobject_transfer/two_pipe_master.i)
(modules/functional_expansion_tools/examples/2D_interface/main.i)
(test/tests/multiapps/picard_failure/picard_master.i)
(test/tests/multiapps/relaxation/picard_relaxed_master.i)
(test/tests/multiapps/reset/multilevel_master.i)
(test/tests/outputs/output_if_base_contains/dt_from_master_sub.i)
(test/tests/transfers/multiapp_scalar_to_auxscalar_transfer/from_sub/master_wrong_order.i)
(test/tests/transfers/multiapp_projection_transfer/fromsub_master.i)
(test/tests/multiapps/restart_multilevel/sub.i)
(modules/porous_flow/examples/multiapp_fracture_flow/diffusion_multiapp/fracture_app_heat.i)
(test/tests/multiapps/picard/picard_master.i)
(test/tests/transfers/multiapp_nearest_node_transfer/parallel_master.i)
(modules/combined/examples/geochem-porous_flow/geotes_weber_tensleep/porous_flow.i)
(test/tests/transfers/multiapp_postprocessor_to_scalar/master.i)
(modules/functional_expansion_tools/examples/2D_interface_no_material/main.i)
(test/tests/transfers/multiapp_nearest_node_transfer/fromsub_fixed_meshes_master.i)
(test/tests/multiapps/steffensen/transient_main.i)
(test/tests/multiapps/relaxation/picard_master.i)
(test/tests/multiapps/move_and_reset/multilevel_sub.i)
(test/tests/multiapps/restart_subapp_ic/master2.i)
(modules/functional_expansion_tools/examples/3D_volumetric_Cartesian/main.i)
(test/tests/restart/restart_transient_from_steady/restart_trans_with_2subs.i)
(test/tests/transfers/multiapp_postprocessor_transfer/from_one_sub_master.i)
(test/tests/transfers/multiapp_nearest_node_transfer/to_multiple_boundaries_master.i)
(test/tests/transfers/multiapp_projection_transfer/tosub_master.i)
(test/tests/multiapps/picard_multilevel/multilevel_dt_rejection/master.i)
(test/tests/outputs/perf_graph/multi_app/master_sub_cycle.i)
(test/tests/multiapps/picard_postprocessor/transient_main.i)
(test/tests/userobjects/postprocessor_spatial_user_object/master.i)
(test/tests/multiapps/multilevel/time_dt_from_master_sub.i)
(tutorials/tutorial02_multiapps/step02_transfers/04_master_multiscale.i)
(test/tests/multiapps/max_procs_per_app/master.i)
(test/tests/multiapps/relaxation/sub_relaxed_master.i)
(modules/functional_expansion_tools/test/tests/standard_use/interface_coupled.i)
(test/tests/multiapps/picard/picard_abs_tol_master.i)
(tutorials/tutorial02_multiapps/step03_coupling/01_master.i)
(test/tests/transfers/multiapp_userobject_transfer/3d_1d_master.i)
(test/tests/transfers/multiapp_scalar_to_auxscalar_transfer/to_sub/master_wrong_order.i)
(test/tests/transfers/multiapp_interpolation_transfer/fromrestrictedsub_master.i)
(test/tests/multiapps/move_and_reset/master.i)
(test/tests/multiapps/multilevel/dt_from_master_master.i)
(test/tests/multiapps/multilevel/time_dt_from_master_master.i)
(test/tests/transfers/multiapp_mesh_function_transfer/tosub.i)
(tutorials/tutorial02_multiapps/step01_multiapps/06_master_twoapps.i)
(test/tests/transfers/multiapp_interpolation_transfer/fromsub_master.i)
(test/tests/multiapps/detect_steady_state/master.i)
(tutorials/tutorial02_multiapps/step01_multiapps/02_master_sublimit.i)
(test/tests/transfers/multiapp_copy_transfer/aux_to_aux/from_sub.i)
(modules/functional_expansion_tools/test/tests/errors/multiapp_missing_sub_object.i)
(test/tests/transfers/multiapp_mesh_function_transfer/fromsub_target_displaced.i)
(test/tests/transfers/multiapp_postprocessor_to_scalar/master2.i)
(tutorials/tutorial02_multiapps/step01_multiapps/03_master_subcycle.i)
(modules/functional_expansion_tools/examples/1D_volumetric_Cartesian/main.i)
(test/tests/transfers/multiapp_copy_transfer/aux_to_aux/to_sub.i)
(test/tests/restart/restart_transient_from_transient/pseudo_trans_with_2subs.i)
(test/tests/multiapps/secant_postprocessor/transient_main.i)
(modules/porous_flow/examples/multiapp_fracture_flow/fracture_diffusion/matrix_app_dirac.i)
(modules/combined/test/tests/restart-transient-from-ss-with-stateful/master_tr.i)
(test/tests/transfers/multiapp_postprocessor_to_scalar/master2_wrong_positions.i)
(test/tests/multiapps/cliargs_from_file/cliargs_master.i)
(test/tests/transfers/multiapp_scalar_to_auxscalar_transfer/from_sub/master.i)
(test/tests/transfers/multiapp_mesh_function_transfer/exec_on_mismatch.i)
(test/tests/multiapps/picard_multilevel/fullsolve_multilevel/sub_level1.i)
(test/tests/multiapps/move_and_reset/multilevel_master.i)
(test/tests/multiapps/picard_catch_up/master.i)

Child Objects

(modules/stochastic_tools/include/multiapps/SamplerTransientMultiApp.h)
(framework/include/multiapps/CentroidMultiApp.h)

(test/tests/multiapps/transient_multiapp/dt_from_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.2

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub_app]
    type = TransientMultiApp
    app_type = MooseTestApp
    input_files = 'dt_from_master_sub.i'
    positions = '0   0   0
                 0.5 0.5 0
                 0.6 0.6 0
                 0.7 0.7 0'
  []
[]

(modules/porous_flow/examples/multiapp_fracture_flow/fracture_diffusion/matrix_app_nonconforming.i)

# A fracture, which is a 1D line of elements, is embedded in a matrix, which is a 2D surface of elements.
# The meshes conform: all fracture nodes are also matrix nodes (the fracture elements are sides of matrix elements).
#
# The heat equation governs temperature in the fracture and matrix system, and heat energy is transferred between the two using a MultiApp approach
[Mesh]
  [generate]
    type = GeneratedMeshGenerator
    dim = 2
    nx = 20
    xmin = 0
    xmax = 10.0
    ny = 20
    ymin = -1.9
    ymax = 2.1
  []
[]

[Variables]
  [matrix_T]
  []
[]

[Kernels]
  [dot]
    type = TimeDerivative
    variable = matrix_T
  []
  [matrix_diffusion]
    type = AnisotropicDiffusion
    variable = matrix_T
    tensor_coeff = '1E-3 0 0 0 1E-3 0 0 0 1E-3'
  []
[]

[DiracKernels]
  [heat_from_fracture]
    type = ReporterPointSource
    variable = matrix_T
    value_name = heat_transfer_rate/transferred_joules_per_s
    x_coord_name = heat_transfer_rate/x
    y_coord_name = heat_transfer_rate/y
    z_coord_name = heat_transfer_rate/z
  []
[]

[VectorPostprocessors]
  [heat_transfer_rate]
    type = ConstantVectorPostprocessor
    vector_names = 'transferred_joules_per_s x y z'
    value = '0; 0; 0; 0'
    outputs = none
  []
[]

[Preconditioning]
  [entire_jacobian]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  solve_type = NEWTON
  dt = 100
  end_time = 100
[]


[Outputs]
  print_linear_residuals = false
  exodus = false
[]

[MultiApps]
  [fracture_app]
    type = TransientMultiApp
    input_files = fracture_app_dirac.i
    cli_args = 'Kernels/toMatrix/transfer_coefficient=0.01'
    execute_on = TIMESTEP_BEGIN
  []
[]

[Transfers]
  [T_to_fracture]
    type = MultiAppInterpolationTransfer
    direction = to_multiapp
    multi_app = fracture_app
    source_variable = matrix_T
    variable = transferred_matrix_T
  []
  [heat_from_fracture]
    type = MultiAppReporterTransfer
    direction = from_multiapp
    multi_app = fracture_app
    from_reporters = 'heat_transfer_rate/joules_per_s heat_transfer_rate/x heat_transfer_rate/y heat_transfer_rate/z'
    to_reporters = 'heat_transfer_rate/transferred_joules_per_s heat_transfer_rate/x heat_transfer_rate/y heat_transfer_rate/z'
  []
[]

(test/tests/transfers/multiapp_nearest_node_transfer/fromsub_displaced_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./from_sub]
  [../]
  [./elemental_from_sub]
    order = CONSTANT
    family = MONOMIAL
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0.48 0 0 -1.01 0 0'
    input_files = fromsub_displaced_sub.i
  [../]
[]

[Transfers]
  [./from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u
    variable = from_sub
    displaced_source_mesh = true
  [../]
  [./elemental_from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u
    variable = elemental_from_sub
    displaced_source_mesh = true
  [../]
[]

(modules/stochastic_tools/test/tests/transfers/sampler_postprocessor/errors/wrong_multi_app.i)

[StochasticTools]
  auto_create_executioner = false
[]

[Distributions]
  [uniform_left]
    type = Uniform
    lower_bound = 0
    upper_bound = 0.5
  []
  [uniform_right]
    type = Uniform
    lower_bound = 1
    upper_bound = 2
  []
[]

[Samplers]
  [sample]
    type = MonteCarlo
    num_rows = 3
    distributions = 'uniform_left uniform_right'
    execute_on = INITIAL # create random numbers on initial and use them for each timestep
  []
[]

[MultiApps]
  [sub]
    type = TransientMultiApp
    input_files = sub.i
    positions = '0 0 0'
  []
[]

[Transfers]
  [runner]
    type = SamplerParameterTransfer
    multi_app = sub
    sampler = sample
    parameters = 'BCs/left/value BCs/right/value'
    to_control = 'stochastic'
    execute_on = INITIAL
    check_multiapp_execute_on = false
  []
  [data]
    type = SamplerPostprocessorTransfer
    multi_app = sub
    sampler = sample
    to_vector_postprocessor = storage
    from_postprocessor = avg
    execute_on = timestep_end
    check_multiapp_execute_on = false
  []
[]

[VectorPostprocessors]
  [storage]
    type = StochasticResults
  []
[]

[Executioner]
  type = Transient
  num_steps = 5
  dt = 0.01
[]

[Outputs]
  csv = true
[]

(test/tests/multiapps/output_in_position/multilevel_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '1 1 0'
    input_files = master.i
    output_in_position = true
  [../]
[]

(test/tests/controls/time_periods/transfers/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.01
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Postprocessors]
  [./average]
    type = ElementAverageValue
    variable = u
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 5
  solve_type = 'PJFNK'
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'

  nl_rel_tol = 1e-12
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./pp_sub]
    app_type = MooseTestApp
    positions = '0.5 0.5 0 0.7 0.7 0'
    execute_on = timestep_end
    type = TransientMultiApp
    input_files = sub.i
  [../]
[]

[Transfers]
  [./pp_transfer]
    type = MultiAppPostprocessorToAuxScalarTransfer
    direction = to_multiapp
    multi_app = pp_sub
    from_postprocessor = average
    to_aux_scalar = from_master_app
  [../]
[]

[Controls]
  [./transfers]
    type = TimePeriod
    enable_objects = Transfer::pp_transfer
    start_time = 2
    execute_on = 'initial timestep_begin'
  [../]
[]

(test/tests/multiapps/sub_cycling/master_iteration_adaptive.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 2
  dt = 0.1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '0 0 0 0 0 0'
    input_files = sub.i
    sub_cycling = true
  [../]
[]

(test/tests/outputs/perf_graph/multi_app/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 5
  dt = 0.2

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  perf_graph = true
[]

[MultiApps]
  [./sub_app]
    positions = '0 0 0'
    type = TransientMultiApp
    input_files = 'sub.i'
    app_type = MooseTestApp
  [../]
[]

(test/tests/multiapps/move/multilevel_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.01

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '1 1 0'
    input_files = multilevel_sub.i
    output_in_position = true
    move_time = 0.05
    move_positions = '2 2 0'
    move_apps = 0
  [../]
[]

(modules/functional_expansion_tools/test/tests/standard_use/multiapp_print_coefficients.i)

[Mesh]
  type = GeneratedMesh
  dim = 1

  xmin = 0.0
  xmax = 10.0
  nx = 15
[]

[Variables]
  [./m]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[AuxVariables]
  [./s_in]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff_m]
    type = Diffusion
    variable = m
  [../]
  [./time_diff_m]
    type = TimeDerivative
    variable = m
  [../]
  [./s_in]
    type = CoupledForce
    variable = m
    v = s_in
  [../]
[]

[AuxKernels]
  [./reconstruct_s_in]
    type = FunctionSeriesToAux
    variable = s_in
    function = FX_Basis_Value_Main
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    variable = m
    value = 1
  [../]
[]

[BCs]
  [./surround]
    type = DirichletBC
    variable = m
    value = 1
    boundary = 'left right'
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '3'
    physical_bounds = '0.0  10.0'
    x = Legendre
    print_when_set = true # Print coefficients when a MultiAppFXTransfer is executed
  [../]
[]

[UserObjects]
  [./FX_Value_UserObject_Main]
    type = FXVolumeUserObject
    function = FX_Basis_Value_Main
    variable = m
    print_state = true # Print after the FX coefficients are computer
    print_when_set = true # Print coefficients when a MultiAppFXTransfer is executed
  [../]
[]

[Postprocessors]
  [./average_value]
    type = ElementAverageValue
    variable = m
  [../]
  [./peak_value]
    type = ElementExtremeValue
    value_type = max
    variable = m
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = multiapp_sub.i
  [../]
[]

[Transfers]
  [./ValueToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Value_UserObject_Main
    multi_app_object_name = FX_Basis_Value_Sub
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
[]

(test/tests/transfers/multiapp_scalar_to_auxscalar_transfer/to_sub/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[AuxVariables]
  [a]
    family = SCALAR
    order = SIXTH
  []
[]

[ICs]
  [ic]
    type = ScalarComponentIC
    variable = a
    values = '1.0 2.0 3.0 4.0 5.0 6.0'
  []
[]

[Variables]
  [dummy]
  []
[]

[Kernels]
  [dummy]
    type = Diffusion
    variable = dummy
  []
[]

[Executioner]
  type = Transient
  num_steps = 1
[]

[MultiApps]
  [sub]
    type = TransientMultiApp
    positions = '0 0 0'
    input_files = 'sub.i'
  []
[]

[Transfers]
  [to_sub]
    type = MultiAppScalarToAuxScalarTransfer
    multi_app = sub
    source_variable = 'a'
    to_aux_scalar = 'b'
    direction = to_multiapp
  []
[]

[Outputs]
    exodus = true
[]

(test/tests/parser/cli_multiapp_all/dt_from_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.2

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  execute_on = 'timestep_end'
  exodus = true
[]

[MultiApps]
  [./sub_left]
    positions = '0 0 0  0.5 0.5 0  0.6 0.6 0  0.7 0.7 0'
    type = TransientMultiApp
    input_files = 'dt_from_master_sub.i'
    app_type = MooseTestApp
  [../]

  [./sub_right]
    positions = '0 0 0  0.5 0.5 0  0.6 0.6 0  0.7 0.7 0'
    type = TransientMultiApp
    input_files = 'dt_from_master_sub.i'
    app_type = MooseTestApp
  [../]
[]

(python/chigger/tests/input/multiapps.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Problem]
  solve = false
[]

[Executioner]
  type = Transient
  num_steps = 20
  dt = 0.1
  solve_type = PJFNK
[]

[MultiApps]
  [./sub]
    app_type = MooseTestApp
    type = TransientMultiApp
    input_files = sub.i
    output_in_position = true
    positions = '0 0 0
                 0 0 0.25
                 0 0 0.5
                 0 0 0.75
                 0 0 1'
  [../]
[]

(test/tests/multiapps/move/multilevel_sub.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.01

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '1 1 0'
    input_files = sub.i
    output_in_position = true
  [../]
[]

(test/tests/restart/restart_transient_from_steady/restart_trans_with_sub.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Problem]
  restart_file_base = steady_with_sub_out_cp/LATEST
  skip_additional_restart_data = true
[]

[AuxVariables]
  [Tf]
  []
[]

[Variables]
  [power_density]
  []
[]

[Functions]
  [pwr_func]
    type = ParsedFunction
    value = '1e3*x*(1-x)+5e2' # increase this function to drive transient
  []
[]

[Kernels]
  [timedt]
    type = TimeDerivative
    variable = power_density
  []

  [diff]
    type = Diffusion
    variable = power_density
  []

  [coupledforce]
    type = BodyForce
    variable = power_density
    function = pwr_func
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = power_density
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = power_density
    boundary = right
    value = 1e3
  []
[]

[Postprocessors]
  [pwr_avg]
    type = ElementAverageValue
    block = '0'
    variable = power_density
    execute_on = 'initial timestep_end'
  []
  [temp_avg]
    type = ElementAverageValue
    variable = Tf
    block = '0'
    execute_on = 'initial timestep_end'
  []
  [temp_max]
    type = ElementExtremeValue
    value_type = max
    variable = Tf
    block = '0'
    execute_on = 'initial timestep_end'
  []
  [temp_min]
    type = ElementExtremeValue
    value_type = min
    variable = Tf
    block = '0'
    execute_on = 'initial timestep_end'
  []
[]

[Executioner]
  type = Transient
  start_time = 0
  end_time = 3
  dt = 1.0

  petsc_options_iname = '-pc_type -pc_hypre_type -ksp_gmres_restart '
  petsc_options_value = 'hypre boomeramg 100'

  nl_abs_tol = 1e-8
  nl_rel_tol = 1e-7

  fixed_point_rel_tol = 1e-7
  fixed_point_abs_tol = 1e-07
  fixed_point_max_its = 4

  line_search = none
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files  = restart_trans_with_sub_sub.i
    execute_on = 'timestep_end'
  [../]
[]

[Transfers]
  [p_to_sub]
    type = MultiAppMeshFunctionTransfer
    direction = to_multiapp
    source_variable = power_density
    variable = power_density
    multi_app = sub
    execute_on = 'timestep_end'
  []
  [t_from_sub]
    type = MultiAppMeshFunctionTransfer
    direction = from_multiapp
    source_variable = temp
    variable = Tf
    multi_app = sub
    execute_on = 'timestep_end'
  []
[]

[Outputs]
  exodus = true
  csv = true
  perf_graph = true
[]

(modules/combined/examples/geochem-porous_flow/geotes_2D/porous_flow.i)

# PorousFlow simulation of injection and production in a 2D aquifer
# Much of this file is standard porous-flow stuff.  The unusual aspects are:
# - transfer of the rates of changes of each species (kg/s) to the aquifer_geochemistry.i simulation.  This is achieved by saving these changes from the PorousFlowMassTimeDerivative residuals
# - transfer of the temperature field to the aquifer_geochemistry.i simulation
# Interesting behaviour can be simulated by this file without its "parent" simulation, exchanger.i.  exchanger.i provides mass-fractions injected via the injection_rate_massfrac_* variables, but since these are more-or-less constant throughout the duration of the exchanger.i simulation, the initial_conditions specified below may be used.  Similar, exchanger.i provides injection_temperature, but that is also constant.

injection_rate = -1.0 # kg/s/m, negative because injection as a source
production_rate = 1.0 # kg/s/m
[Mesh]
  [gen]
    type = GeneratedMeshGenerator
    dim = 2
    nx = 14 # for better resolution, use 56 or 112
    ny = 8  # for better resolution, use 32 or 64
    xmin = -70
    xmax = 70
    ymin = -40
    ymax = 40
  []
  [injection_node]
    input = gen
    type = ExtraNodesetGenerator
    new_boundary = injection_node
    coord = '-30 0 0'
  []
[]

[GlobalParams]
  PorousFlowDictator = dictator
  gravity = '0 0 0'
[]

[Variables]
  [f0]
    initial_condition = 0.002285946
  []
  [f1]
    initial_condition = 0.0035252
  []
  [f2]
    initial_condition = 1.3741E-05
  []
  [porepressure]
    initial_condition = 2E6
  []
  [temperature]
    initial_condition = 50
    scaling = 1E-6 # fluid enthalpy is roughly 1E6
  []
[]

[BCs]
  [injection_temperature]
    type = MatchedValueBC
    variable = temperature
    v = injection_temperature
    boundary = injection_node
  []
[]

[DiracKernels]
  [inject_Na]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    line_length = 1.0
    multiplying_var = injection_rate_massfrac_Na
    point_file = injection.bh
    variable = f0
  []
  [inject_Cl]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    line_length = 1.0
    multiplying_var = injection_rate_massfrac_Cl
    point_file = injection.bh
    variable = f1
  []
  [inject_SiO2]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    line_length = 1.0
    multiplying_var = injection_rate_massfrac_SiO2
    point_file = injection.bh
    variable = f2
  []
  [inject_H2O]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    line_length = 1.0
    multiplying_var = injection_rate_massfrac_H2O
    point_file = injection.bh
    variable = porepressure
  []

  [produce_Na]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_Na
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    line_length = 1.0
    mass_fraction_component = 0
    point_file = production.bh
    variable = f0
  []
  [produce_Cl]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_Cl
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    line_length = 1.0
    mass_fraction_component = 1
    point_file = production.bh
    variable = f1
  []
  [produce_SiO2]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_SiO2
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    line_length = 1.0
    mass_fraction_component = 2
    point_file = production.bh
    variable = f2
  []
  [produce_H2O]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_H2O
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    line_length = 1.0
    mass_fraction_component = 3
    point_file = production.bh
    variable = porepressure
  []
  [produce_heat]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_heat
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    line_length = 1.0
    use_enthalpy = true
    point_file = production.bh
    variable = temperature
  []
[]

[UserObjects]
  [injected_mass]
    type = PorousFlowSumQuantity
  []
  [produced_mass_Na]
    type = PorousFlowSumQuantity
  []
  [produced_mass_Cl]
    type = PorousFlowSumQuantity
  []
  [produced_mass_SiO2]
    type = PorousFlowSumQuantity
  []
  [produced_mass_H2O]
    type = PorousFlowSumQuantity
  []
  [produced_heat]
    type = PorousFlowSumQuantity
  []
[]

[Postprocessors]
  [dt]
    type = TimestepSize
    execute_on = TIMESTEP_BEGIN
  []
  [tot_kg_injected_this_timestep]
    type = PorousFlowPlotQuantity
    uo = injected_mass
  []
  [kg_Na_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_Na
  []
  [kg_Cl_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_Cl
  []
  [kg_SiO2_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_SiO2
  []
  [kg_H2O_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_H2O
  []
  [mole_rate_Na_produced]
    type = FunctionValuePostprocessor
    function = moles_Na
  []
  [mole_rate_Cl_produced]
    type = FunctionValuePostprocessor
    function = moles_Cl
  []
  [mole_rate_SiO2_produced]
    type = FunctionValuePostprocessor
    function = moles_SiO2
  []
  [mole_rate_H2O_produced]
    type = FunctionValuePostprocessor
    function = moles_H2O
  []
  [heat_joules_extracted_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_heat
  []
  [production_temperature]
    type = PointValue
    point = '30 0 0'
    variable = temperature
  []
[]

[Functions]
  [moles_Na]
    type = ParsedFunction
    vars = 'kg_Na dt'
    vals = 'kg_Na_produced_this_timestep dt'
    value = 'kg_Na * 1000 / 22.9898 / dt'
  []
  [moles_Cl]
    type = ParsedFunction
    vars = 'kg_Cl dt'
    vals = 'kg_Cl_produced_this_timestep dt'
    value = 'kg_Cl * 1000 / 35.453 / dt'
  []
  [moles_SiO2]
    type = ParsedFunction
    vars = 'kg_SiO2 dt'
    vals = 'kg_SiO2_produced_this_timestep dt'
    value = 'kg_SiO2 * 1000 / 60.0843 / dt'
  []
  [moles_H2O]
    type = ParsedFunction
    vars = 'kg_H2O dt'
    vals = 'kg_H2O_produced_this_timestep dt'
    value = 'kg_H2O * 1000 / 18.0152 / dt'
  []
[]

[Modules]
  [FluidProperties]
    [the_simple_fluid]
      type = SimpleFluidProperties
      thermal_expansion = 0
      bulk_modulus = 2E9
      viscosity = 1E-3
      density0 = 1000
      cv = 4000.0
      cp = 4000.0
    []
  []
[]

[PorousFlowFullySaturated]
  coupling_type = ThermoHydro
  porepressure = porepressure
  temperature = temperature
  mass_fraction_vars = 'f0 f1 f2'
  save_component_rate_in = 'rate_Na rate_Cl rate_SiO2 rate_H2O' # change in kg at every node / dt
  fp = the_simple_fluid
  temperature_unit = Celsius
[]

[AuxVariables]
  [injection_temperature]
    initial_condition = 200
  []
  [injection_rate_massfrac_Na]
    initial_condition = 0.002285946
  []
  [injection_rate_massfrac_Cl]
    initial_condition = 0.0035252
  []
  [injection_rate_massfrac_SiO2]
    initial_condition = 1.3741E-05
  []
  [injection_rate_massfrac_H2O]
    initial_condition = 0.994175112
  []
  [rate_H2O]
  []
  [rate_Na]
  []
  [rate_Cl]
  []
  [rate_SiO2]
  []
[]

[Materials]
  [porosity]
    type = PorousFlowPorosityConst # this simulation has no porosity changes from dissolution
    porosity = 0.1
  []
  [permeability]
    type = PorousFlowPermeabilityConst
    permeability = '1E-12 0 0   0 1E-12 0   0 0 1E-12'
  []
  [thermal_conductivity]
    type = PorousFlowThermalConductivityIdeal
    dry_thermal_conductivity = '0 0 0  0 0 0  0 0 0'
  []
  [rock_heat]
    type = PorousFlowMatrixInternalEnergy
    density = 2500.0
    specific_heat_capacity = 1200.0
  []
[]

[Preconditioning]
  active = typically_efficient
  [typically_efficient]
    type = SMP
    full = true
    petsc_options_iname = '-pc_type -pc_hypre_type'
    petsc_options_value = ' hypre    boomeramg'
  []
  [strong]
    type = SMP
    full = true
    petsc_options = '-ksp_diagonal_scale -ksp_diagonal_scale_fix'
    petsc_options_iname = '-pc_type -sub_pc_type -sub_pc_factor_shift_type -pc_asm_overlap'
    petsc_options_value = ' asm      ilu           NONZERO                   2'
  []
  [probably_too_strong]
    type = SMP
    full = true
    petsc_options_iname = '-pc_type -pc_factor_mat_solver_package'
    petsc_options_value = ' lu       mumps'
  []
[]

[Executioner]
  type = Transient
  solve_type = Newton
  end_time = 7.76E6 # 90 days
  dt = 1E5
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [react]
    type = TransientMultiApp
    input_files = aquifer_geochemistry.i
    clone_master_mesh = true
    execute_on = 'timestep_end'
  []
[]

[Transfers]
  [changes_due_to_flow]
    type = MultiAppCopyTransfer
    direction = to_multiapp
    source_variable = 'rate_H2O rate_Na rate_Cl rate_SiO2 temperature'
    variable = 'pf_rate_H2O pf_rate_Na pf_rate_Cl pf_rate_SiO2 temperature'
    multi_app = react
  []
  [massfrac_from_geochem]
    type = MultiAppCopyTransfer
    direction = from_multiapp
    source_variable = 'massfrac_Na massfrac_Cl massfrac_SiO2'
    variable = 'f0 f1 f2'
    multi_app = react
  []
[]

(test/tests/controls/time_periods/multiapps/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '1. 0. 0.'
    input_files = sub.i
    execute_on = 'initial timestep_end'
    output_in_position = true
  [../]
[]

[Controls]
  [./multiapp]
    type = TimePeriod
    disable_objects = 'MultiApps::sub'
    start_time = '0'
    end_time = '0.25'
    execute_on = 'initial timestep_begin'
  [../]
[]

(test/tests/outputs/transferred_scalar_variable/transferred_scalar_variable.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./average_scalar]
    family = SCALAR
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
  csv = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '0 0 0'
    input_files = sub.i
  [../]
[]

[Transfers]
  [./average_transfer]
    type = MultiAppPostprocessorToAuxScalarTransfer
    direction = from_multiapp
    multi_app = sub
    from_postprocessor = average
    to_aux_scalar = average_scalar
  [../]
[]

(test/tests/parser/cli_multiapp_group/dt_from_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.2

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  execute_on = 'timestep_end'
  exodus = true
[]

[MultiApps]
  [./sub_left]
    positions = '0 0 0  0.5 0.5 0  0.6 0.6 0  0.7 0.7 0'
    type = TransientMultiApp
    input_files = 'dt_from_master_sub.i'
    app_type = MooseTestApp
  [../]

  [./sub_right]
    positions = '0 0 0  0.5 0.5 0  0.6 0.6 0  0.7 0.7 0'
    type = TransientMultiApp
    input_files = 'dt_from_master_sub.i'
    app_type = MooseTestApp
  [../]
[]

(test/tests/transfers/multiapp_nearest_node_transfer/boundary_tosub_master.i)

[Mesh]
  file = 2blk.e
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left_1]
    type = DirichletBC
    variable = u
    boundary = '1'
    value = 4
  [../]
  [./left_2]
    type = DirichletBC
    variable = u
    boundary = '2'
    value = 3
  [../]

  [./right_3]
    type = DirichletBC
    variable = u
    boundary = '3'
    value = 2
  [../]
  [./right_4]
    type = DirichletBC
    variable = u
    boundary = '4'
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '0 -4 0'
    input_files = boundary_tosub_sub.i
  [../]
[]

[Transfers]
  [./to_sub_1]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    source_boundary = 1
    variable = from_master_1
  [../]
  [./to_sub_2]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    source_boundary = 2
    variable = from_master_2
  [../]
  [./to_sub_3]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    source_boundary = 3
    variable = from_master_3
  [../]
  [./to_sub_4]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    source_boundary = 4
    variable = from_master_4
  [../]
[]

(test/tests/transfers/multiapp_variable_value_sample_transfer/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  # Yes we want a slightly irregular grid
  nx = 11
  ny = 11
  # We will transfer data to the sub app, and that is currently only
  # supported from a replicated mesh
  parallel_type = replicated
[]

[Variables]
  [u]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub]
    app_type = MooseTestApp
    positions = '0.5 0.5 0 0.7 0.7 0'
    execute_on = timestep_end
    type = TransientMultiApp
    input_files = sub.i
  []
[]

[Transfers]
  [sample_transfer]
    source_variable = u
    direction = to_multiapp
    variable = from_master
    type = MultiAppVariableValueSampleTransfer
    multi_app = sub
  []
[]

[Problem]
  parallel_barrier_messaging = false
[]

(test/tests/transfers/multiapp_vector_pp_transfer/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0
  xmax = 1
  ymin = 1
  ymax = 2
[]

[Problem]
  kernel_coverage_check = false
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./v]
    [./InitialCondition]
      type = FunctionIC
      function = set_v
    [../]
  [../]
[]

[Functions]
  [./set_v]
    type = ParsedFunction
    value = 'x + 2 * y'
  [../]
[]

[VectorPostprocessors]
  [./sample_points]
    type = PointValueSampler
    variable = v
    points = '0.25 1.25 0 0.5 1.5 0'
    sort_by = x
    execute_on = 'initial timestep_end'
  [../]

  [./receive_values]
    type = PointValueSampler
    variable = v
    points = '0.25 1.25 0 0.5 1.5 0'
    sort_by = x
    execute_on = initial
  [../]
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    input_files = 'sub.i'
    positions = '0.25 1.25 0 0.5 1.5 0'
    max_procs_per_app = 1
  [../]
[]

[Transfers]
  [./send]
    type = MultiAppVectorPostprocessorTransfer
    vector_postprocessor = sample_points
    postprocessor = receive
    vector_name = v
    direction = to_multiapp
    multi_app = sub
  [../]

  [./receive]
    type = MultiAppVectorPostprocessorTransfer
    vector_postprocessor = receive_values
    postprocessor = send
    vector_name = v
    direction = from_multiapp
    multi_app = sub
  [../]
[]

[Executioner]
  type = Transient
  nl_abs_tol = 1e-10
  num_steps = 1
[]

[Outputs]
  csv = true
[]

(test/tests/transfers/multiapp_variable_value_sample_transfer/pp_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./pp_sub]
    app_type = MooseTestApp
    positions = '0.5 0.5 0 0.7 0.7 0'
    execute_on = timestep_end
    type = TransientMultiApp
    input_files = pp_sub.i
  [../]
[]

[Transfers]
  [./sample_pp_transfer]
    source_variable = u
    direction = to_multiapp
    postprocessor = from_master
    type = MultiAppVariableValueSamplePostprocessorTransfer
    multi_app = pp_sub
  [../]
[]

(tutorials/tutorial02_multiapps/step01_multiapps/05_master_parallel.i)

[Mesh]
  type = GeneratedMesh
  dim = 3
  nx = 40
  ny = 40
  nz = 40
[]

[Variables]
  [u]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
  [force]
    type = BodyForce
    variable = u
    value = 1.
  []
  [td]
    type = TimeDerivative
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 0
  []
[]

[Executioner]
  type = Transient
  end_time = 1
  dt = 1.

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
  perf_graph = true
[]

[MultiApps]
  [sub_app]
    type = TransientMultiApp
    positions   = '0 0 0  1 0 0  2 0 0'
    input_files = '05_sub_parallel.i'
  []
[]

(test/tests/transfers/reporter_transfer/clone_type.i)

[Mesh/generate]
  type = GeneratedMeshGenerator
  dim = 1
[]

[Problem]
  kernel_coverage_check = false
  solve = false
[]

[Reporters]
  [receiver]
    type = ConstantReporter
  []
[]

[MultiApps]
  [multi_reporter]
    type = TransientMultiApp
    input_files = 'sub0.i sub0.i sub0.i sub0.i'
    positions = '0 0 0
                 0 0 0
                 0 0 0
                 0 0 0'
    cli_args = 'Postprocessors/from_sub_pp/default=3.1415926;Reporters/from_sub_rep/integer_values=10;Reporters/from_sub_rep/string_values=ten;Outputs/active=""
                Postprocessors/from_sub_pp/default=1.5707963;Reporters/from_sub_rep/integer_values=11;Reporters/from_sub_rep/string_values=twenty;Outputs/active=""
                Postprocessors/from_sub_pp/default=1.0471975;Reporters/from_sub_rep/integer_values=12;Reporters/from_sub_rep/string_values=thirty;Outputs/active=""
                Postprocessors/from_sub_pp/default=0.7853981;Reporters/from_sub_rep/integer_values=13;Reporters/from_sub_rep/string_values=forty;Outputs/active=""'
    max_procs_per_app = 1
  []
[]

[Transfers]
  [multi_rep]
    type = MultiAppCloneReporterTransfer
    from_reporters = 'from_sub_pp/value from_sub_rep/int from_sub_rep/str'
    to_reporter = receiver
    multi_app = multi_reporter
    reporter_type = 'real integer string'
  []
[]

[Executioner]
  type = Transient
  num_steps = 1
[]

[Outputs]
  [out]
    type = JSON
    execute_system_information_on = NONE
    vectorpostprocessors_as_reporters = true
  []
  execute_on = timestep_end
[]

(tutorials/tutorial02_multiapps/step01_multiapps/07_master_multilevel.i)

[Mesh]
  type = GeneratedMesh
  dim = 3
  nx = 40
  ny = 40
  nz = 40
[]

[Variables]
  [u]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
  [force]
    type = BodyForce
    variable = u
    value = 1.
  []
  [td]
    type = TimeDerivative
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 0
  []
[]

[Executioner]
  type = Transient
  end_time = 1
  dt = 1.

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
  perf_graph = true
[]

[MultiApps]
  [uno]
    type = TransientMultiApp
    positions   = '0 0 0  1 0 0'
    input_files = '07_sub_multilevel.i'
  []
[]

(test/tests/transfers/transfer_interpolation/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  # This test currently diffs when run in parallel with DistributedMesh enabled,
  # most likely due to the fact that it uses some geometric search stuff.
  # For more information, see #2121.
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[UserObjects]
  [./layered_average]
    type = LayeredAverage
    variable = u
    direction = x
    num_layers = 3
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1
  nl_rel_tol = 1e-10

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]
[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '0 0 0'
    input_files = sub.i
    sub_cycling = true
    interpolate_transfers = true
    output_sub_cycles = true
  [../]
[]

[Transfers]
  [./nearest_node]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = nearest_node
  [../]
  [./mesh_function]
    type = MultiAppMeshFunctionTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = mesh_function
  [../]
  [./user_object]
    type = MultiAppUserObjectTransfer
    direction = to_multiapp
    multi_app = sub
    variable = user_object
    user_object = layered_average
  [../]
  [./interpolation]
    type = MultiAppInterpolationTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = interpolation
  [../]
[]

(test/tests/multiapps/sub_cycling_failure/master_gold.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Functions]
  # These mimic the behavior of the failing solve
  [./dts]
    type = PiecewiseLinear
    x = '0    0.1   0.15'
    y = '0.1  0.05  0.1'
  [../]
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 4
  dt = 0.1

  [./TimeStepper]
    type = FunctionDT
    function = dts
  [../]

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '0 0 0'
    input_files = sub_gold.i
    sub_cycling = true
  [../]
[]

(test/tests/multiapps/move/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.01

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '1 1 0'
    input_files = sub.i
    output_in_position = true
    move_time = 0.05
    move_positions = '2 2 0'
    move_apps = 0
  [../]
[]

(test/tests/multiapps/multilevel/dt_from_sub_sub.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 0.3

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0 0.5 0.5 0'
    input_files = dt_from_sub_subsub.i
  [../]
[]

(modules/functional_expansion_tools/examples/3D_volumetric_cylindrical/main.i)

# Basic example coupling a master and sub app in a 3D cylindrical mesh from an input file
#
# The master app provides field values to the sub app via Functional Expansions, which then performs
# its calculations. The sub app's solution field values are then transferred back to the master app
# and coupled into the solution of the master app solution.
#
# This example couples Functional Expansions via AuxVariable, the recommended approach.
#
# Note: this problem is not light, and may take a few minutes to solve.
[Mesh]
  type = FileMesh
  file = cyl-tet.e
[]

[Variables]
  [./m]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[AuxVariables]
  [./s_in]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff_m]
    type = HeatConduction
    variable = m
  [../]
  [./time_diff_m]
    type = HeatConductionTimeDerivative
    variable = m
  [../]
  [./s_in] # Add in the contribution from the SubApp
    type = CoupledForce
    variable = m
    v = s_in
  [../]
[]

[AuxKernels]
  [./reconstruct_s_in]
    type = FunctionSeriesToAux
    variable = s_in
    function = FX_Basis_Value_Main
  [../]
[]

[Materials]
  [./Unobtanium]
    type = GenericConstantMaterial
    prop_names =  'thermal_conductivity specific_heat density'
    prop_values = '1.0                  1.0           1.0' # W/(cm K), J/(g K), g/cm^3
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    variable = m
    value = 1
  [../]
[]

[BCs]
  [./surround]
    type = DirichletBC
    variable = m
    value = 1
    boundary = 'top bottom outside'
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = CylindricalDuo
    orders = '5   3' # Axial first, then (r, t) FX
    physical_bounds = '-2.5 2.5   0 0 1' # z_min z_max   x_center y_center radius
    z = Legendre # Axial in z
    disc = Zernike # (r, t) default to unit disc in x-y plane
  [../]
[]

[UserObjects]
  [./FX_Value_UserObject_Main]
    type = FXVolumeUserObject
    function = FX_Basis_Value_Main
    variable = m
  [../]
[]

[Postprocessors]
  [./average_value]
    type = ElementAverageValue
    variable = m
  [../]
  [./peak_value]
    type = ElementExtremeValue
    value_type = max
    variable = m
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = sub.i
  [../]
[]

[Transfers]
  [./ValueToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Value_UserObject_Main
    multi_app_object_name = FX_Basis_Value_Sub
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
[]

(test/tests/multiapps/picard_multilevel/picard_sub.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./v]
  [../]
[]

[AuxVariables]
  [./v2]
  [../]
[]

[Kernels]
  [./diff_v]
    type = Diffusion
    variable = v
  [../]
  [./coupled_force]
    type = CoupledForce
    variable = v
    v = v2
  [../]
  [./td_v]
    type = TimeDerivative
    variable = v
  [../]
[]

[BCs]
  [./left_v]
    type = DirichletBC
    variable = v
    boundary = left
    value = 1
  [../]
  [./right_v]
    type = DirichletBC
    variable = v
    boundary = right
    value = 0
  [../]
[]

[Postprocessors]
  # Accumulate the number of times 'timestep_end' is reached
  # (which is an indicator of the number of Picard iterations)
  [./cumulative_picard_its_pp]
    type = TestPostprocessor
    test_type = custom_execute_on
    execute_on = 'timestep_end'
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 5
  dt = 1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub2]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = picard_sub2.i
    sub_cycling = true
    execute_on = timestep_end
  [../]
[]

[Transfers]
  [./v2]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub2
    source_variable = v
    variable = v2
  [../]
[]

(test/tests/transfers/multiapp_userobject_transfer/restricted_node_master.i)

num_layers = 2

[Mesh]
  [box]
    type = GeneratedMeshGenerator
    dim = 3
    nx = ${num_layers}
    ny = 3
    nz = 3
    xmin = 0.25
    xmax = 1.25
  []
  # The MultiAppUserObjectTransfer object only works with ReplicatedMesh
  parallel_type = replicated
[]

[Variables]
  [u]
  []
[]

[Kernels]
  [td]
    type = TimeDerivative
    variable = u
  []

  [diff]
    type = Diffusion
    variable = u
  []
[]

[AuxVariables]
  [a]
  []

  [s]
  []
[]

[AuxKernels]
  [s_ak]
    type = ParsedAux
    variable = s
    use_xyzt = true
    function = 'x+(z*z)'
  []
[]

[Functions]
[]

[Postprocessors]
  [a_avg]
    type = ElementAverageValue
    variable = a
  []
[]

[UserObjects]
  [S_avg_front]
    type = LayeredSideAverage
    boundary = front
    variable = s
    num_layers = ${num_layers}
    direction = x
  []

  [S_avg_back]
    type = LayeredSideAverage
    boundary = back
    variable = s
    num_layers = ${num_layers}
    direction = x
  []
[]

[MultiApps]
  [ch0]
    type = TransientMultiApp
    input_files = 'restricted_node_sub.i'
    bounding_box_padding = '0 0.5 1'
    positions = '0 0.5 -0.1'
    output_in_position = true
    cli_args = 'yy=0'
  []
  [ch1]
    type = TransientMultiApp
    input_files = 'restricted_node_sub.i'
    bounding_box_padding = '0 0.5 1'
    positions = '0 0.5  1.1'
    output_in_position = true
    cli_args = 'yy=1'
  []
[]

[Transfers]
  [from_ch0]
    type = MultiAppUserObjectTransfer
    boundary = back
    direction = from_multiapp
    multi_app = ch0
    variable = a
    user_object = A_avg
  []

  [from_ch1]
    type = MultiAppUserObjectTransfer
    boundary = front
    direction = from_multiapp
    multi_app = ch1
    variable = a
    user_object = A_avg
  []

  [to_ch0]
    type = MultiAppUserObjectTransfer
    block = 20
    direction = to_multiapp
    multi_app = ch0
    variable = S
    user_object = S_avg_back
  []

  [to_ch1]
    type = MultiAppUserObjectTransfer
    block = 20
    direction = to_multiapp
    multi_app = ch1
    variable = S
    user_object = S_avg_front
  []
[]

[Executioner]
  type = Transient
  num_steps = 2

  dt = 1
  nl_abs_tol = 1e-7
[]

[Outputs]
  exodus = true
[]

(test/tests/transfers/multiapp_nearest_node_transfer/boundary_tomaster_master.i)

# Master mesh and sub mesh are same with 4x4 quad8 elements.
# master mesh has top boundary fixed at u=2 and bottom fixed at u=0
# sub mesh has top boundary fixed at u = 0 and bottom fixed at u=1
# The u variable at right boundary of sub mesh is transferred to
# from_sub variable of master mesh at left boundary

# Result is from_sub at left boundary has linearly increasing value starting
# with 0 at top and ending with 1 at bottom. from_sub is zero everywhere else
# in the master mesh.

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 4
  ny = 4
  elem_type = QUAD8
[]

[Variables]
  [./u]
    family = LAGRANGE
    order = FIRST
  [../]
[]

[AuxVariables]
  [./from_sub]
    family = LAGRANGE
    order = SECOND
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./top]
    type = DirichletBC
    variable = u
    boundary = top
    value = 2.0
  [../]
  [./bottom]
    type = DirichletBC
    variable = u
    boundary = bottom
    value = 0.0
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = boundary_tomaster_sub.i
  [../]
[]

[Transfers]
  [./from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u
    source_boundary = right
    target_boundary = left
    variable = from_sub
  [../]
[]

(modules/porous_flow/examples/multiapp_fracture_flow/single_fracture_heat_transfer/matrix_app.i)

# Matrix physics, which is just heat conduction.  Heat energy comes from the fracture App
[Mesh]
  [generate]
    type = GeneratedMeshGenerator
    dim = 2
    nx = 20
    xmin = 0
    xmax = 100.0
    ny = 9
    ymin = -9
    ymax = 9
  []
[]

[Variables]
  [matrix_T]
    initial_condition = 40 # degC
  []
[]

[Kernels]
  [dot]
    type = CoefTimeDerivative
    variable = matrix_T
    Coefficient = 1E5
  []
  [matrix_diffusion]
    type = AnisotropicDiffusion
    variable = matrix_T
    tensor_coeff = '1 0 0 0 1 0 0 0 1'
  []
[]

[DiracKernels]
  [heat_from_fracture]
    type = ReporterPointSource
    variable = matrix_T
    value_name = heat_transfer_rate/transferred_joules_per_s
    x_coord_name = heat_transfer_rate/x
    y_coord_name = heat_transfer_rate/y
    z_coord_name = heat_transfer_rate/z
  []
[]

[VectorPostprocessors]
  [heat_transfer_rate]
    type = ConstantVectorPostprocessor
    vector_names = 'transferred_joules_per_s x y z'
    value = '0; 0; 0; 0'
    outputs = none
  []
[]

[Preconditioning]
  [entire_jacobian]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  solve_type = NEWTON
  dt = 1
  end_time = 100
  nl_abs_tol = 1E-3
[]


[Outputs]
  print_linear_residuals = false
  exodus = true
  csv=true
[]

[MultiApps]
  [fracture_app]
    type = TransientMultiApp
    input_files = fracture_app.i
    execute_on = TIMESTEP_BEGIN
  []
[]

[Transfers]
  [T_to_fracture]
    type = MultiAppInterpolationTransfer
    direction = to_multiapp
    multi_app = fracture_app
    source_variable = matrix_T
    variable = transferred_matrix_T
  []
  [heat_from_fracture]
    type = MultiAppReporterTransfer
    direction = from_multiapp
    multi_app = fracture_app
    from_reporters = 'heat_transfer_rate/joules_per_s heat_transfer_rate/x heat_transfer_rate/y heat_transfer_rate/z'
    to_reporters = 'heat_transfer_rate/transferred_joules_per_s heat_transfer_rate/x heat_transfer_rate/y heat_transfer_rate/z'
  []
[]

(tutorials/tutorial02_multiapps/step02_transfers/03_master_uot.i)

[Mesh]
  type = GeneratedMesh
  dim = 3

  nx = 10
  ny = 10
  nz = 10

  zmax = 3
[]

[Variables]
  [u]
  []
[]

[AuxVariables]
  [v_average]
    order = CONSTANT
    family = MONOMIAL
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
  [force]
    type = BodyForce
    variable = u
    value = 1.
  []
  [td]
    type = TimeDerivative
    variable = u
  []
[]

[BCs]
  [front]
    type = DirichletBC
    variable = u
    boundary = front
    value = 0
  []
  [back]
    type = DirichletBC
    variable = u
    boundary = back
    value = 1
  []
[]

[Executioner]
  type = Transient
  end_time = 2
  dt = 0.2

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[UserObjects]
  [layered_integral]
    type = NearestPointLayeredIntegral
    points = '0.15 0.15 0  0.45 0.45 0  0.75 0.75 0'
    direction = z
    num_layers = 4
    variable = u
  []
[]

[MultiApps]
  [sub_app]
    type = TransientMultiApp
    positions = '0.15 0.15 0  0.45 0.45 0  0.75 0.75 0'
    input_files = '03_sub_uot.i'
    execute_on = timestep_end
    output_in_position = true
  []
[]

[Transfers]
  [push_u]
    type = MultiAppUserObjectTransfer
    multi_app = sub_app
    direction = to_multiapp
    variable = u_integral
    user_object = layered_integral
  []

  [pull_v]
    type = MultiAppUserObjectTransfer
    multi_app = sub_app
    direction = from_multiapp
    variable = v_average
    user_object = layered_average
  []
[]

(test/tests/outputs/console/multiapp/picard_master_both.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./v_begin]
  [../]
  [./v_end]
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
  [./force_u_begin]
    type = CoupledForce
    variable = u
    v = v_begin
  [../]
  [./force_u_end]
    type = CoupledForce
    variable = u
    v = v_end
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Postprocessors]
  [picard_its]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_abs_tol = 1e-14
[]

[MultiApps]
  [./sub_begin]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = picard_sub.i
  [../]
  [./sub_end]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '1 1 1'
    input_files = picard_sub.i
    execute_on = 'timestep_end'
  [../]
[]

[Transfers]
  [./v_from_sub_begin]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub_begin
    source_variable = v
    variable = v_begin
  [../]
  [./u_to_sub_begin]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub_begin
    source_variable = u
    variable = u
  [../]
  [./v_from_sub_end]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub_end
    source_variable = v
    variable = v_end
  [../]
  [./u_to_sub_end]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub_end
    source_variable = u
    variable = u
  [../]
[]

(test/tests/multiapps/auto_diff_auto_scaling/main.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = ADDiffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = FunctionDirichletBC
    variable = u
    boundary = right
    function = 't'
  [../]
[]

[Preconditioning]
  [./smp]
    type = SMP
    full = true
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 2
  solve_type = 'Newton'
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  automatic_scaling = true
  verbose = true
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub_app]
    type = TransientMultiApp
    app_type = MooseTestApp
    input_files = 'sub.i'
    positions = '0   0   0'
  []
[]

(test/tests/transfers/multiapp_postprocessor_to_scalar/master2_wrong_order.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./from_sub_app]
    order = FOURTH
    family = SCALAR
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.01
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Postprocessors]
  [./average]
    type = ElementAverageValue
    variable = u
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 5

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./pp_sub]
    app_type = MooseTestApp
    positions = '0.5 0.5 0
                 0.7 0.7 0
                 0.8 0.8 0'
    execute_on = timestep_end
    type = TransientMultiApp
    input_files = sub2.i
  [../]
[]

[Transfers]
  [./pp_transfer]
    type = MultiAppPostprocessorToAuxScalarTransfer
    direction = from_multiapp
    multi_app = pp_sub
    from_postprocessor = point_value
    to_aux_scalar = from_sub_app
  [../]
[]

(test/tests/transfers/multiapp_mesh_function_transfer/tosub_target_displaced.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    positions = '.1 .1 0 0.6 0.6 0 0.6 0.1 0'
    type = TransientMultiApp
    app_type = MooseTestApp
    input_files = tosub_sub.i
    execute_on = timestep_end
  [../]
[]

[Transfers]
  [./to_sub]
    source_variable = u
    direction = to_multiapp
    variable = transferred_u
    type = MultiAppMeshFunctionTransfer
    multi_app = sub
    displaced_target_mesh = true
  [../]
  [./elemental_to_sub]
    source_variable = u
    direction = to_multiapp
    variable = elemental_transferred_u
    type = MultiAppMeshFunctionTransfer
    multi_app = sub
    displaced_target_mesh = true
  [../]
[]

(test/tests/multiapps/grid-sequencing/vi-coarse.i)

l=10
nx=40
num_steps=2

[Mesh]
  type = GeneratedMesh
  dim = 1
  xmax = ${l}
  nx = ${nx}
[]

[Variables]
  [u]
  []
[]

[AuxVariables]
  [bounds][]
[]

[Bounds]
  [./u_upper_bound]
    type = ConstantBoundsAux
    variable = bounds
    bounded_variable = u
    bound_type = upper
    bound_value = ${l}
  [../]
  [./u_lower_bound]
    type = ConstantBoundsAux
    variable = bounds
    bounded_variable = u
    bound_type = lower
    bound_value = 0
  [../]
[]

[ICs]
  [u]
    type = FunctionIC
    variable = u
    function = 'x'
  []
[]

[Kernels]
  [time]
    type = TimeDerivative
    variable = u
  []
  [diff]
    type = Diffusion
    variable = u
  []
  [ffn]
    type = BodyForce
    variable = u
    function = 'if(x<5,-1,1)'
  []
[]

[BCs]
  [left]
    type = DirichletBC
    boundary = left
    value = 0
    variable = u
  []
  [right]
    type = DirichletBC
    boundary = right
    value = ${l}
    variable = u
  []
[]

[Preconditioning]
  [smp]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  num_steps = ${num_steps}
  solve_type = NEWTON
  dtmin = 1
  petsc_options = '-snes_vi_monitor'
  petsc_options_iname = '-snes_max_linear_solve_fail -ksp_max_it -pc_type -sub_pc_factor_levels -snes_linesearch_type -snes_type'
  petsc_options_value = '0                           30          asm      16                    basic                 vinewtonrsls'
[]

[Outputs]
  exodus = true
  [csv]
    type = CSV
    execute_on = 'nonlinear timestep_end'
  []
  [dof]
    type = DOFMap
    execute_on = 'initial'
  []
[]

[Debug]
  show_var_residual_norms = true
[]

[Postprocessors]
  active = 'upper_violations lower_violations'
  [upper_violations]
    type = GreaterThanLessThanPostprocessor
    variable = u
    execute_on = 'nonlinear timestep_end'
    value = ${fparse 10+1e-8}
    comparator = 'greater'
  []
  [lower_violations]
    type = GreaterThanLessThanPostprocessor
    variable = u
    execute_on = 'nonlinear timestep_end'
    value = -1e-8
    comparator = 'less'
  []
  [nls]
    type = NumNonlinearIterations
  []
  [cum_nls]
    type = CumulativeValuePostprocessor
    postprocessor = nls
  []
[]

[MultiApps]
  [./coarser]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_begin
    positions = '0 0 0'
    input_files = vi-coarser.i
  [../]
[]

[Transfers]
  [./mesh_function_begin]
    type = MultiAppMeshFunctionTransfer
    direction = from_multiapp
    multi_app = coarser
    source_variable = u
    variable = u
    execute_on = timestep_begin
  [../]
[]

(test/tests/transfers/multiapp_postprocessor_transfer/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [u]
  []
[]

[Kernels]
  [diff]
    type = CoefDiffusion
    variable = u
    coef = 0.01
  []
  [td]
    type = TimeDerivative
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Postprocessors]
  [average]
    type = ElementAverageValue
    variable = u
  []
[]

[Executioner]
  type = Transient
  num_steps = 5

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'

  nl_rel_tol = 1e-12
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [pp_sub]
    app_type = MooseTestApp
    positions = '0.5 0.5 0 0.7 0.7 0'
    execute_on = timestep_end
    type = TransientMultiApp
    input_files = sub.i
  []
[]

[Transfers]
  [pp_transfer]
    type = MultiAppPostprocessorTransfer
    direction = to_multiapp
    multi_app = pp_sub
    from_postprocessor = average
    to_postprocessor = from_master
  []
[]

(modules/functional_expansion_tools/examples/2D_volumetric_Cartesian/main.i)

# Basic example coupling a master and sub app in a 2D Cartesian volume.
#
# The master app provides field values to the sub app via Functional Expansions, which then performs
# its calculations. The sub app's solution field values are then transferred back to the master app
# and coupled into the solution of the master app solution.
#
# This example couples Functional Expansions via AuxVariable.
[Mesh]
  type = GeneratedMesh
  dim = 2

  xmin = 0.0
  xmax = 10.0
  nx = 15

  ymin = 1.0
  ymax = 11.0
  ny = 25
[]

[Variables]
  [./m]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[AuxVariables]
  [./s_in]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff_m]
    type = HeatConduction
    variable = m
  [../]
  [./time_diff_m]
    type = HeatConductionTimeDerivative
    variable = m
  [../]
  [./s_in] # Add in the contribution from the SubApp
    type = CoupledForce
    variable = m
    v = s_in
  [../]
[]

[AuxKernels]
  [./reconstruct_s_in]
    type = FunctionSeriesToAux
    variable = s_in
    function = FX_Basis_Value_Main
  [../]
[]

[Materials]
  [./Unobtanium]
    type = GenericConstantMaterial
    prop_names =  'thermal_conductivity specific_heat density'
    prop_values = '1.0                  1.0           1.0' # W/(cm K), J/(g K), g/cm^3
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    variable = m
    value = 1
  [../]
[]

[BCs]
  [./surround]
    type = DirichletBC
    variable = m
    value = 1
    boundary = 'top bottom left right'
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '3   4'
    physical_bounds = '0.0  10.0    1.0 11.0'
    x = Legendre
    y = Legendre
  [../]
[]

[UserObjects]
  [./FX_Value_UserObject_Main]
    type = FXVolumeUserObject
    function = FX_Basis_Value_Main
    variable = m
  [../]
[]

[Postprocessors]
  [./average_value]
    type = ElementAverageValue
    variable = m
  [../]
  [./peak_value]
    type = ElementExtremeValue
    value_type = max
    variable = m
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = sub.i
  [../]
[]

[Transfers]
  [./ValueToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Value_UserObject_Main
    multi_app_object_name = FX_Basis_Value_Sub
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
[]

(modules/functional_expansion_tools/test/tests/standard_use/multiapp_different_physical_boundaries.i)

[Mesh]
  type = GeneratedMesh
  dim = 1

  xmin = 0.0
  xmax = 10.0
  nx = 15
[]

[Variables]
  [./m]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[AuxVariables]
  [./s_in]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff_m]
    type = Diffusion
    variable = m
  [../]
  [./time_diff_m]
    type = TimeDerivative
    variable = m
  [../]
  [./s_in]
    type = CoupledForce
    variable = m
    v = s_in
  [../]
[]

[AuxKernels]
  [./reconstruct_s_in]
    type = FunctionSeriesToAux
    variable = s_in
    function = FX_Basis_Value_Main
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    variable = m
    value = 1
  [../]
[]

[BCs]
  [./surround]
    type = DirichletBC
    variable = m
    value = 1
    boundary = 'left right'
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '3'
    physical_bounds = '1.0  9.0'
    x = Legendre
  [../]
[]

[UserObjects]
  [./FX_Value_UserObject_Main]
    type = FXVolumeUserObject
    function = FX_Basis_Value_Main
    variable = m
  [../]
[]

[Postprocessors]
  [./average_value]
    type = ElementAverageValue
    variable = m
  [../]
  [./peak_value]
    type = ElementExtremeValue
    value_type = max
    variable = m
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = multiapp_sub.i
  [../]
[]

[Transfers]
  [./ValueToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Value_UserObject_Main
    multi_app_object_name = FX_Basis_Value_Sub
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
[]

(modules/functional_expansion_tools/test/tests/standard_use/volume_coupling_custom_norm.i)

[Mesh]
  type = GeneratedMesh
  dim = 1

  xmin = 0.0
  xmax = 10.0
  nx = 15
[]

[Variables]
  [./m]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[AuxVariables]
  [./s_in]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff_m]
    type = Diffusion
    variable = m
  [../]
  [./time_diff_m]
    type = TimeDerivative
    variable = m
  [../]
  [./s_in]
    type = CoupledForce
    variable = m
    v = s_in
  [../]
[]

[AuxKernels]
  [./reconstruct_s_in]
    type = FunctionSeriesToAux
    variable = s_in
    function = FX_Basis_Value_Main
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    variable = m
    value = 1
  [../]
[]

[BCs]
  [./surround]
    type = DirichletBC
    variable = m
    value = 1
    boundary = 'left right'
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '3'
    physical_bounds = '0.0  10.0'
    x = Legendre
    generation_type = 'sqrt_mu'
    expansion_type = 'sqrt_mu'
  [../]
[]

[UserObjects]
  [./FX_Value_UserObject_Main]
    type = FXVolumeUserObject
    function = FX_Basis_Value_Main
    variable = m
  [../]
[]

[Postprocessors]
  [./average_value]
    type = ElementAverageValue
    variable = m
  [../]
  [./peak_value]
    type = ElementExtremeValue
    value_type = max
    variable = m
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
  file_base = 'volume_coupled_out'
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = volume_coupling_custom_norm_sub.i
  [../]
[]

[Transfers]
  [./ValueToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Value_UserObject_Main
    multi_app_object_name = FX_Basis_Value_Sub
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
[]

(modules/functional_expansion_tools/test/tests/errors/multiapp_bad_user_object.i)

[Mesh]
  type = GeneratedMesh
  dim = 1

  xmin = 0.0
  xmax = 10.0
  nx = 15
[]

[Variables]
  [./m]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[AuxVariables]
  [./s_in]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff_m]
    type = Diffusion
    variable = m
  [../]
  [./time_diff_m]
    type = TimeDerivative
    variable = m
  [../]
  [./s_in]
    type = CoupledForce
    variable = m
    v = s_in
  [../]
[]

[AuxKernels]
  [./reconstruct_s_in]
    type = FunctionSeriesToAux
    variable = s_in
    function = FX_Basis_Value_Main
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    variable = m
    value = 1
  [../]
[]

[BCs]
  [./surround]
    type = DirichletBC
    variable = m
    value = 1
    boundary = 'left right'
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '3'
    physical_bounds = '0.0  10.0'
    x = Legendre
  [../]
[]

[UserObjects]
  [./FX_Value_UserObject_Main]
    type = FXVolumeUserObject
    function = FX_Basis_Value_Main
    variable = m
  [../]
  [./AnotheruserObject]
    type = EmptyPostprocessor
  [../]
[]

[Postprocessors]
  [./average_value]
    type = ElementAverageValue
    variable = m
  [../]
  [./peak_value]
    type = ElementExtremeValue
    value_type = max
    variable = m
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = multiapp_sub.i
  [../]
[]

[Transfers]
  [./ValueToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = AnotheruserObject
    multi_app_object_name = FX_Basis_Value_Sub
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
[]

(test/tests/multiapps/output_in_position/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '1 1 0'
    input_files = sub.i
    output_in_position = true
  [../]
[]

(test/tests/multiapps/initial_intactive/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.2

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    positions = '0 0 0'
    type = TransientMultiApp
    input_files = 'sub.i'
    app_type = MooseTestApp
    enable = false # Start with a multiapp that's disabled up front
    sub_cycling = true
  [../]
[]

[Controls]
  [./multiapp_enable]
    type = TimePeriod
    disable_objects = 'MultiApps::sub'
    start_time = 0
    end_time = 1.3
    execute_on = 'timestep_begin'
    reverse_on_false = true
  [../]
[]

(test/tests/multiapps/reset/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.01

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '0 0 0'
    input_files = sub.i
    reset_apps = 0
    reset_time = 0.05
  [../]
[]

(tutorials/tutorial02_multiapps/step03_coupling/02_master_picard.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [u]
  []
[]

[AuxVariables]
  [vt]
  []
[]

[Kernels]
  [diff]
    type = MatDiffusion
    variable = u
  []
  [force]
    type = BodyForce
    variable = u
    value = 1.
  []
  [td]
    type = TimeDerivative
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Materials]
  [diff]
    type = ParsedMaterial
    f_name = D
    args = 'vt'
    function = 'vt'
  []
[]

[Executioner]
  type = Transient
  end_time = 2
  dt = 0.2

  picard_max_its = 10

  nl_abs_tol = 1e-10
  picard_rel_tol = 1e-6
  picard_abs_tol = 1e-10

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [micro]
    type = TransientMultiApp
    positions = '0.15 0.15 0  0.45 0.45 0  0.75 0.75 0'
    input_files = '02_sub_picard.i'
    execute_on = timestep_end
    output_in_position = true
  []
[]

[Transfers]
  [push_u]
    type = MultiAppVariableValueSampleTransfer
    multi_app = micro
    direction = to_multiapp
    source_variable = u
    variable = ut
  []

  [pull_v]
    type = MultiAppPostprocessorInterpolationTransfer
    multi_app = micro
    direction = from_multiapp
    variable = vt
    postprocessor = average_v
  []
[]

(test/tests/multiapps/secant/transient_main.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 5
  ny = 5
  parallel_type = replicated
  uniform_refine = 1
[]

[Variables]
  [u]
  []
[]

[AuxVariables]
  [v]
  []
[]

[Kernels]
  [diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  []
  [time]
    type = TimeDerivative
    variable = u
  []
  [force_u]
    type = CoupledForce
    variable = u
    v = v
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Postprocessors]
  [unorm]
    type = ElementL2Norm
    variable = u
  []
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  nl_abs_tol = 1e-14

  fixed_point_algorithm = 'secant'
  fixed_point_max_its = 30
  transformed_variables = 'u'
[]

[Outputs]
  csv = true
  exodus = false
[]

[MultiApps]
  [sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = 'transient_sub.i'
    clone_master_mesh = true
    execute_on = 'timestep_begin'
  []
[]

[Transfers]
  [v_from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = v
    variable = v
    execute_on = 'timestep_begin'
  []
  [u_to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = u
    execute_on = 'timestep_begin'
  []
[]

(test/tests/transfers/multiapp_variable_value_sample_transfer/master_fv.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  # Yes we want a slightly irregular grid
  nx = 11
  ny = 11
  # We will transfer data to the sub app, and that is currently only
  # supported from a replicated mesh
  parallel_type = replicated
[]

[Variables]
  [u]
    family = MONOMIAL
    order = CONSTANT
    fv = true
  []
[]

[FVKernels]
  [diff]
    type = FVDiffusion
    variable = u
    coeff = 1
  []
[]

[FVBCs]
  [left]
    type = FVDirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = FVDirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub]
    app_type = MooseTestApp
    positions = '0.5 0.5 0 0.7 0.7 0'
    execute_on = timestep_end
    type = TransientMultiApp
    input_files = sub.i
  []
  [pp_sub]
    app_type = MooseTestApp
    positions = '0.5 0.5 0 0.7 0.7 0'
    execute_on = timestep_end
    type = TransientMultiApp
    input_files = pp_sub.i
  []
[]

[Transfers]
  [sample_transfer]
    source_variable = u
    direction = to_multiapp
    variable = from_master
    type = MultiAppVariableValueSampleTransfer
    multi_app = sub
  []
  [sample_pp_transfer]
      source_variable = u
      direction = to_multiapp
      postprocessor = from_master
      type = MultiAppVariableValueSamplePostprocessorTransfer
      multi_app = pp_sub
  []
[]

[Problem]
  parallel_barrier_messaging = false
[]

(test/tests/transfers/get_transfers_from_feproblem/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  # This test currently diffs when run in parallel with DistributedMesh enabled,
  # most likely due to the fact that it uses some geometric search stuff.
  # For more information, see #2121.
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[UserObjects]
  [./layered_average]
    type = GetTransferUserObject
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1
  nl_rel_tol = 1e-10

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '0 0 0'
    input_files = sub.i
  [../]
[]

[Transfers]
  [./nearest_node]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = nearest_node
  [../]
  [./mesh_function]
    type = MultiAppMeshFunctionTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = mesh_function
  [../]
[]

(modules/functional_expansion_tools/test/tests/errors/multiapp_missing_local_object.i)

[Mesh]
  type = GeneratedMesh
  dim = 1

  xmin = 0.0
  xmax = 10.0
  nx = 15
[]

[Variables]
  [./m]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[AuxVariables]
  [./s_in]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff_m]
    type = Diffusion
    variable = m
  [../]
  [./time_diff_m]
    type = TimeDerivative
    variable = m
  [../]
  [./s_in]
    type = CoupledForce
    variable = m
    v = s_in
  [../]
[]

[AuxKernels]
  [./reconstruct_s_in]
    type = FunctionSeriesToAux
    variable = s_in
    function = FX_Basis_Value_Main
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    variable = m
    value = 1
  [../]
[]

[BCs]
  [./surround]
    type = DirichletBC
    variable = m
    value = 1
    boundary = 'left right'
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '3'
    physical_bounds = '0.0  10.0'
    x = Legendre
  [../]
[]

[UserObjects]
  [./FX_Value_UserObject_Main]
    type = FXVolumeUserObject
    function = FX_Basis_Value_Main
    variable = m
  [../]
[]

[Postprocessors]
  [./average_value]
    type = ElementAverageValue
    variable = m
  [../]
  [./peak_value]
    type = ElementExtremeValue
    value_type = max
    variable = m
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = multiapp_sub.i
  [../]
[]

[Transfers]
  [./ValueToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Value_UserObject
    multi_app_object_name = FX_Basis_Value_Sub
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
[]

(test/tests/transfers/multiapp_postprocessor_interpolation_transfer/multilevel_sub.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./subsub_average]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./force]
    type = CoupledForce
    variable = u
    v = subsub_average
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Postprocessors]
  [./sub_average]
    type = ElementAverageValue
    variable = u
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 0.3

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0 0.5 0.5 0'
    input_files = multilevel_subsub.i
  [../]
[]

[Transfers]
  [./subsub_average]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = from_multiapp
    multi_app = sub
    variable = subsub_average
    postprocessor = subsub_average
  [../]
[]

(test/tests/multiapps/restart/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0
  ymin = 0
  xmax = 1
  ymax = 1
  nx = 10
  ny = 10
[]

[Functions]
  [./v_fn]
    type = ParsedFunction
    value = t*x
  [../]
  [./ffn]
    type = ParsedFunction
    value = x
  [../]
[]

[AuxVariables]
  [./v]
  [../]
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
  [./ufn]
    type = BodyForce
    variable = u
    function = ffn
  [../]
[]

[BCs]
  [./all]
    type = FunctionDirichletBC
    variable = u
    boundary = 'left right top bottom'
    function = v_fn
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 5
  dt = 0.1
  solve_type = 'PJFNK'
[]

[Outputs]
  exodus = true
  checkpoint = true
[]

[MultiApps]
  [./sub_app]
    app_type = MooseTestApp
    type = TransientMultiApp
    input_files = 'sub.i'
    execute_on = timestep_end
    positions = '0 -1 0'
  [../]
[]

[Transfers]
  [./from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub_app
    source_variable = u
    variable = v
  [../]
[]

(test/tests/multiapps/picard_multilevel/2level_picard/sub_level1.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0
  xmax = 1
  ymin = 0
  ymax = 1
  nx = 10
  ny = 10
[]

[Variables]
  [v]
  []
[]

[AuxVariables]
  [u]
  []
  [w]
  []
[]

[Kernels]
  [time_derivative]
    type = TimeDerivative
    variable = v
  []
  [diffusion]
    type = Diffusion
    variable = v
  []
  [source]
    type = CoupledForce
    variable = v
    v = u
  []
[]

[BCs]
  [dirichlet0]
    type = DirichletBC
    variable = v
    boundary = '0'
    value = 0
  []
  [dirichlet]
    type = DirichletBC
    variable = v
    boundary = '2'
    value = 100
  []
[]

[Postprocessors]
  [avg_u]
    type = ElementAverageValue
    variable = u
    execute_on = 'initial timestep_begin timestep_end'
  []
  [avg_v]
    type = ElementAverageValue
    variable = v
    execute_on = 'initial timestep_begin timestep_end'
  []
  [avg_w]
    type = ElementAverageValue
    variable = w
    execute_on = 'initial timestep_begin timestep_end'
  []
[]

[Executioner]
  type = Transient

  petsc_options_iname = '-pc_type -pc_hypre_type -ksp_gmres_restart '
  petsc_options_value = 'hypre boomeramg 100'

  end_time = 0.1
  dt = 0.02
[]


[MultiApps]
  [level2-]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = sub_level2.i
    execute_on = 'timestep_end'
  []
[]

[Transfers]
  [v_to_sub]
    type = MultiAppMeshFunctionTransfer
    direction = to_multiapp
    source_variable = v
    variable = v
    multi_app = level2-
    execute_on = 'timestep_end'
  []
  [w_from_sub]
    type = MultiAppMeshFunctionTransfer
    direction = from_multiapp
    source_variable = w
    variable = w
    multi_app = level2-
    execute_on = 'timestep_end'
  []
[]

[Outputs]
  exodus = true
  csv = true
  perf_graph = true
  [screen]
    type = Console
    execute_postprocessors_on= "timestep_end timestep_begin"
  []
[]

(test/tests/multiapps/grid-sequencing/vi-fine.i)

l=10
nx=80
num_steps=2

[Mesh]
  type = GeneratedMesh
  dim = 1
  xmax = ${l}
  nx = ${nx}
[]

[Variables]
  [u]
  []
[]

[AuxVariables]
  [bounds][]
[]

[Bounds]
  [./u_upper_bounds]
    type = ConstantBoundsAux
    variable = bounds
    bounded_variable = u
    bound_type = upper
    bound_value = ${l}
  [../]
  [./u_lower_bounds]
    type = ConstantBoundsAux
    variable = bounds
    bounded_variable = u
    bound_type = lower
    bound_value = 0
  [../]
[]

[ICs]
  [u]
    type = FunctionIC
    variable = u
    function = 'x'
  []
[]

[Kernels]
  [time]
    type = TimeDerivative
    variable = u
  []
  [diff]
    type = Diffusion
    variable = u
  []
  [ffn]
    type = BodyForce
    variable = u
    function = 'if(x<5,-1,1)'
  []
[]

[BCs]
  [left]
    type = DirichletBC
    boundary = left
    value = 0
    variable = u
  []
  [right]
    type = DirichletBC
    boundary = right
    value = ${l}
    variable = u
  []
[]

[Preconditioning]
  [smp]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  num_steps = ${num_steps}
  solve_type = NEWTON
  dtmin = 1
  petsc_options = '-snes_vi_monitor'
  petsc_options_iname = '-snes_max_linear_solve_fail -ksp_max_it -pc_type -sub_pc_factor_levels -snes_linesearch_type -snes_type'
  petsc_options_value = '0                           30          asm      16                    basic                 vinewtonrsls'
[]

[Outputs]
  exodus = true
  [csv]
    type = CSV
    execute_on = 'nonlinear timestep_end'
  []
  [dof]
    type = DOFMap
    execute_on = 'initial'
  []
[]

[Debug]
  show_var_residual_norms = true
[]

[Postprocessors]
  active = 'upper_violations lower_violations'
  [upper_violations]
    type = GreaterThanLessThanPostprocessor
    variable = u
    execute_on = 'nonlinear timestep_end'
    value = ${fparse 10+1e-8}
    comparator = 'greater'
  []
  [lower_violations]
    type = GreaterThanLessThanPostprocessor
    variable = u
    execute_on = 'nonlinear timestep_end'
    value = -1e-8
    comparator = 'less'
  []
  [nls]
    type = NumNonlinearIterations
  []
  [cum_nls]
    type = CumulativeValuePostprocessor
    postprocessor = nls
  []
[]

[MultiApps]
  [./coarse]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_begin
    positions = '0 0 0'
    input_files = vi-coarse.i
  [../]
[]

[Transfers]
  [./mesh_function_begin]
    type = MultiAppMeshFunctionTransfer
    direction = from_multiapp
    multi_app = coarse
    source_variable = u
    variable = u
    execute_on = timestep_begin
  [../]
[]

(test/tests/multiapps/time_offset/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.2

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub_app]
    type = TransientMultiApp
    input_files = 'sub.i'
    global_time_offset = 0.8
  [../]
[]

(test/tests/multiapps/petsc_options/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 2
  dt = 1
  l_max_its = 4
  nl_max_its = 2

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  petsc_options = '-test'
  l_tol = 1e-12
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '0 0 0'
    input_files = sub.i
  [../]
[]

(test/tests/multiapps/sub_cycling_failure/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 4
  dt = 0.1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '0 0 0'
    input_files = sub.i
    sub_cycling = true
  [../]
[]

(modules/stochastic_tools/test/tests/transfers/errors/master_multiapp_type_error.i)

[StochasticTools]
  auto_create_executioner = false
[]

[Distributions]
  [uniform]
    type = Uniform
    lower_bound = 0
    upper_bound = 0.5
  []
[]

[Samplers]
  [sample]
    type = MonteCarlo
    num_rows = 5
    distributions = 'uniform'
    execute_on = 'initial timestep_end'
  []
[]

[MultiApps]
  [sub]
    type = TransientMultiApp
    input_files = sub.i
    positions = '0 0 0'
  []
[]

[Transfers]
  [sub]
    type = SamplerParameterTransfer
    multi_app = sub
    sampler = sample
    parameters = 'BCs/left/value BCs/right/value'
    to_control = 'stochasticsub'
  []
[]

[Executioner]
  type = Transient
  num_steps = 5
  dt = 0.01
[]

[Outputs]
  execute_on = 'INITIAL TIMESTEP_END'
[]

(test/tests/multiapps/picard_sub_cycling/picard_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./v]
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
  [./force_u]
    type = CoupledForce
    variable = u
    v = v
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 2
  dt = 1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = picard_sub.i
    sub_cycling = true
    interpolate_transfers = true
  [../]
[]

[Transfers]
  [./v_from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = v
    variable = v
  [../]
  [./u_to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = u
  [../]
[]

(test/tests/multiapps/sub_cycling/main_negative.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  start_time = -1.0
  end_time = 0
  dt = 0.5

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '0 0 0'
    input_files = sub.i
    sub_cycling = true
  [../]
[]

(test/tests/transfers/multiapp_nearest_node_transfer/tosub_displaced_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '0.48 0 0'
    input_files = tosub_displaced_sub.i
  [../]
[]

[Transfers]
  [./to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = from_master
    displaced_target_mesh = true
  [../]
  [./elemental_to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = elemental_from_master
    displaced_target_mesh = true
  [../]
[]

(tutorials/tutorial02_multiapps/step02_transfers/01_master_meshfunction.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [u]
  []
[]

[AuxVariables]
  [tv]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
  [force]
    type = BodyForce
    variable = u
    value = 1.
  []
  [td]
    type = TimeDerivative
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 0
  []
[]

[Executioner]
  type = Transient
  end_time = 2
  dt = 0.2

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub_app]
    type = TransientMultiApp
    positions = '0 0 0'
    input_files = '01_sub_meshfunction.i'
  []
[]

[Transfers]
  [pull_v]
    type = MultiAppMeshFunctionTransfer

    multi_app = sub_app

    # Transfer from the sub-app to this app
    direction = from_multiapp

    # The name of the variable in the sub-app
    source_variable = v

    # The name of the auxiliary variable in this app
    variable = tv
  []

  [push_u]
    type = MultiAppMeshFunctionTransfer

    multi_app = sub_app

    # Transfer to the sub-app from this app
    direction = to_multiapp

    # The name of the variable in this app
    source_variable = u

    # The name of the auxiliary variable in the sub-app
    variable = tu
  []
[]

(modules/combined/examples/geochem-porous_flow/forge/porous_flow.i)

# Input file modified from RobPodgorney version
# - 2D instead of 3D with different resolution.  Effectively this means a 1m height of RobPodgorney aquifer is simulated.  RobPodgorney total mass flux is 2.5kg/s meaning 0.25kg/s is appropriate here
# - Celsius instead of Kelvin
# - no use of PorousFlowPointEnthalpySourceFromPostprocessor since that is not yet merged into MOOSE: a DirichletBC is used instead
# - Use of PorousFlowFullySaturated instead of PorousFlowUnsaturated, and the save_component_rate_in feature to record the change in kg of each species at each node for passing to the Geochem simulation
# - MultiApps and Transfers to transfer information between this simulation and the aquifer_geochemistry.i simulation
[Mesh]
  [gen]
    type = GeneratedMeshGenerator
    dim = 2
    nx = 225
    ny = 200
    xmin = -400
    xmax = 500
    ymin = -400
    ymax = 400
  []
  [injection_node]
    input = gen
    type = ExtraNodesetGenerator
    new_boundary = injection_node
    coord = '0 0 0'
  []
[]

[GlobalParams]
  PorousFlowDictator = dictator
  gravity = '0 0 0'
[]

[Variables]
  [f_H]
    initial_condition = 8.201229858451E-07
  []
  [f_Na]
    initial_condition = 2.281094143525E-03
  []
  [f_K]
    initial_condition = 2.305489507836E-04
  []
  [f_Ca]
    initial_condition = 5.818776782059E-04
  []
  [f_Mg]
    initial_condition = 1.539513498238E-07
  []
  [f_SiO2]
    initial_condition = 2.691822196469E-04
  []
  [f_Al]
    initial_condition = 4.457519474122E-08
  []
  [f_Cl]
    initial_condition = 4.744309776594E-03
  []
  [f_SO4]
    initial_condition = 9.516650880811E-06
  []
  [f_HCO3]
    initial_condition = 5.906126982324E-05
  []
  [porepressure]
    initial_condition = 20E6
  []
  [temperature]
    initial_condition = 220 # degC
    scaling = 1E-6 # fluid enthalpy is roughly 1E6
  []
[]

[BCs]
  [source_temperature]
    type = DirichletBC
    boundary = injection_node
    variable = temperature
    value = 70 # degC
  []
[]

[DiracKernels]
  [inject_H]
    type = PorousFlowPointSourceFromPostprocessor
    point = ' 0 0 0'
    mass_flux = 4.790385871045E-08
    variable = f_H
  []
  [inject_Na]
    type = PorousFlowPointSourceFromPostprocessor
    point = ' 0 0 0'
    mass_flux = 7.586252963780E-07
    variable = f_Na
  []
  [inject_K]
    type = PorousFlowPointSourceFromPostprocessor
    point = ' 0 0 0'
    mass_flux = 2.746517625125E-07
    variable = f_K
  []
  [inject_Ca]
    type = PorousFlowPointSourceFromPostprocessor
    point = ' 0 0 0'
    mass_flux = 7.775129478597E-07
    variable = f_Ca
  []
  [inject_Mg]
    type = PorousFlowPointSourceFromPostprocessor
    point = ' 0 0 0'
    mass_flux = 1.749872109005E-07
    variable = f_Mg
  []
  [inject_SiO2]
    type = PorousFlowPointSourceFromPostprocessor
    point = ' 0 0 0'
    mass_flux = 4.100547515915E-06
    variable = f_SiO2
  []
  [inject_Al]
    type = PorousFlowPointSourceFromPostprocessor
    point = ' 0 0 0'
    mass_flux = 2.502408592080E-08
    variable = f_Al
  []
  [inject_Cl]
    type = PorousFlowPointSourceFromPostprocessor
    point = ' 0 0 0'
    mass_flux = 1.997260386272E-06
    variable = f_Cl
  []
  [inject_SO4]
    type = PorousFlowPointSourceFromPostprocessor
    point = ' 0 0 0'
    mass_flux = 2.497372164191E-07
    variable = f_SO4
  []
  [inject_HCO3]
    type = PorousFlowPointSourceFromPostprocessor
    point = ' 0 0 0'
    mass_flux = 5.003150992902E-06
    variable = f_HCO3
  []
  [inject_H2O]
    type = PorousFlowPointSourceFromPostprocessor
    point = ' 0 0 0'
    mass_flux = 2.499865905987E-01
    variable = porepressure
  []

  [produce_H]
    type = PorousFlowPeacemanBorehole
    variable = f_H
    SumQuantityUO = produced_mass_H
    mass_fraction_component = 0
    point_file = production.bh
    line_length = 1
    bottom_p_or_t = 20E6
    unit_weight = '0 0 0'
    use_mobility = true
    character = 1
  []
  [produce_Na]
    type = PorousFlowPeacemanBorehole
    variable = f_Na
    SumQuantityUO = produced_mass_Na
    mass_fraction_component = 1
    point_file = production.bh
    line_length = 1
    bottom_p_or_t = 20E6
    unit_weight = '0 0 0'
    use_mobility = true
    character = 1
  []
  [produce_K]
    type = PorousFlowPeacemanBorehole
    variable = f_K
    SumQuantityUO = produced_mass_K
    mass_fraction_component = 2
    point_file = production.bh
    line_length = 1
    bottom_p_or_t = 20E6
    unit_weight = '0 0 0'
    use_mobility = true
    character = 1
  []
  [produce_Ca]
    type = PorousFlowPeacemanBorehole
    variable = f_Ca
    SumQuantityUO = produced_mass_Ca
    mass_fraction_component = 3
    point_file = production.bh
    line_length = 1
    bottom_p_or_t = 20E6
    unit_weight = '0 0 0'
    use_mobility = true
    character = 1
  []
  [produce_Mg]
    type = PorousFlowPeacemanBorehole
    variable = f_Mg
    SumQuantityUO = produced_mass_Mg
    mass_fraction_component = 4
    point_file = production.bh
    line_length = 1
    bottom_p_or_t = 20E6
    unit_weight = '0 0 0'
    use_mobility = true
    character = 1
  []
  [produce_SiO2]
    type = PorousFlowPeacemanBorehole
    variable = f_SiO2
    SumQuantityUO = produced_mass_SiO2
    mass_fraction_component = 5
    point_file = production.bh
    line_length = 1
    bottom_p_or_t = 20E6
    unit_weight = '0 0 0'
    use_mobility = true
    character = 1
  []
  [produce_Al]
    type = PorousFlowPeacemanBorehole
    variable = f_Al
    SumQuantityUO = produced_mass_Al
    mass_fraction_component = 6
    point_file = production.bh
    line_length = 1
    bottom_p_or_t = 20E6
    unit_weight = '0 0 0'
    use_mobility = true
    character = 1
  []
  [produce_Cl]
    type = PorousFlowPeacemanBorehole
    variable = f_Cl
    SumQuantityUO = produced_mass_Cl
    mass_fraction_component = 7
    point_file = production.bh
    line_length = 1
    bottom_p_or_t = 20E6
    unit_weight = '0 0 0'
    use_mobility = true
    character = 1
  []
  [produce_SO4]
    type = PorousFlowPeacemanBorehole
    variable = f_SO4
    SumQuantityUO = produced_mass_SO4
    mass_fraction_component = 8
    point_file = production.bh
    line_length = 1
    bottom_p_or_t = 20E6
    unit_weight = '0 0 0'
    use_mobility = true
    character = 1
  []
  [produce_HCO3]
    type = PorousFlowPeacemanBorehole
    variable = f_HCO3
    SumQuantityUO = produced_mass_HCO3
    mass_fraction_component = 9
    point_file = production.bh
    line_length = 1
    bottom_p_or_t = 20E6
    unit_weight = '0 0 0'
    use_mobility = true
    character = 1
  []
  [produce_H2O]
    type = PorousFlowPeacemanBorehole
    variable = porepressure
    SumQuantityUO = produced_mass_H2O
    mass_fraction_component = 10
    point_file = production.bh
    line_length = 1
    bottom_p_or_t = 20E6
    unit_weight = '0 0 0'
    use_mobility = true
    character = 1
  []
  [remove_heat_at_production_well]
    type = PorousFlowPeacemanBorehole
    variable = temperature
    SumQuantityUO = produced_heat
    point_file = production.bh
    line_length = 1
    bottom_p_or_t = 20E6
    unit_weight = '0 0 0'
    use_mobility = true
    use_enthalpy = true
    character = 1
  []
[]

[UserObjects]
  [produced_mass_H]
    type = PorousFlowSumQuantity
  []
  [produced_mass_Na]
    type = PorousFlowSumQuantity
  []
  [produced_mass_K]
    type = PorousFlowSumQuantity
  []
  [produced_mass_Ca]
    type = PorousFlowSumQuantity
  []
  [produced_mass_Mg]
    type = PorousFlowSumQuantity
  []
  [produced_mass_SiO2]
    type = PorousFlowSumQuantity
  []
  [produced_mass_Al]
    type = PorousFlowSumQuantity
  []
  [produced_mass_Cl]
    type = PorousFlowSumQuantity
  []
  [produced_mass_SO4]
    type = PorousFlowSumQuantity
  []
  [produced_mass_HCO3]
    type = PorousFlowSumQuantity
  []
  [produced_mass_H2O]
    type = PorousFlowSumQuantity
  []
  [produced_heat]
    type = PorousFlowSumQuantity
  []
[]

[Postprocessors]
  [heat_extracted]
    type = PorousFlowPlotQuantity
    uo = produced_heat
  []
  [approx_production_temperature]
    type = PointValue
    point = '100 0 0'
    variable = temperature
  []
  [mass_extracted_H]
    type = PorousFlowPlotQuantity
    uo = produced_mass_H
    execute_on = 'initial timestep_end'
  []
  [mass_extracted_Na]
    type = PorousFlowPlotQuantity
    uo = produced_mass_Na
    execute_on = 'initial timestep_end'
  []
  [mass_extracted_K]
    type = PorousFlowPlotQuantity
    uo = produced_mass_K
    execute_on = 'initial timestep_end'
  []
  [mass_extracted_Ca]
    type = PorousFlowPlotQuantity
    uo = produced_mass_Ca
    execute_on = 'initial timestep_end'
  []
  [mass_extracted_Mg]
    type = PorousFlowPlotQuantity
    uo = produced_mass_Mg
    execute_on = 'initial timestep_end'
  []
  [mass_extracted_SiO2]
    type = PorousFlowPlotQuantity
    uo = produced_mass_SiO2
    execute_on = 'initial timestep_end'
  []
  [mass_extracted_Al]
    type = PorousFlowPlotQuantity
    uo = produced_mass_Al
    execute_on = 'initial timestep_end'
  []
  [mass_extracted_Cl]
    type = PorousFlowPlotQuantity
    uo = produced_mass_Cl
    execute_on = 'initial timestep_end'
  []
  [mass_extracted_SO4]
    type = PorousFlowPlotQuantity
    uo = produced_mass_SO4
    execute_on = 'initial timestep_end'
  []
  [mass_extracted_HCO3]
    type = PorousFlowPlotQuantity
    uo = produced_mass_HCO3
    execute_on = 'initial timestep_end'
  []
  [mass_extracted_H2O]
    type = PorousFlowPlotQuantity
    uo = produced_mass_H2O
    execute_on = 'initial timestep_end'
  []
  [mass_extracted]
    type = LinearCombinationPostprocessor
    pp_names = 'mass_extracted_H mass_extracted_Na mass_extracted_K mass_extracted_Ca mass_extracted_Mg mass_extracted_SiO2 mass_extracted_Al mass_extracted_Cl mass_extracted_SO4 mass_extracted_HCO3 mass_extracted_H2O'
    pp_coefs = '1 1 1 1 1 1 1 1 1 1 1'
    execute_on = 'initial timestep_end'
  []
  [dt]
    type = TimestepSize
    execute_on = 'timestep_begin'
  []
[]

[Modules]
  [FluidProperties]
    [the_simple_fluid]
      type = SimpleFluidProperties
      thermal_expansion = 2E-4
      bulk_modulus = 2E9
      viscosity = 1E-3
      density0 = 980
      cv = 4000.0
      cp = 4000.0
      porepressure_coefficient = 0
    []
  []
[]

[PorousFlowFullySaturated]
  coupling_type = ThermoHydro
  porepressure = porepressure
  temperature = temperature
  mass_fraction_vars = 'f_H f_Na f_K f_Ca f_Mg f_SiO2 f_Al f_Cl f_SO4 f_HCO3'
  save_component_rate_in = 'rate_H rate_Na rate_K rate_Ca rate_Mg rate_SiO2 rate_Al rate_Cl rate_SO4 rate_HCO3 rate_H2O' # change in kg at every node / dt
  fp = the_simple_fluid
  temperature_unit = Celsius
[]

[AuxVariables]
  [rate_H]
  []
  [rate_Na]
  []
  [rate_K]
  []
  [rate_Ca]
  []
  [rate_Mg]
  []
  [rate_SiO2]
  []
  [rate_Al]
  []
  [rate_Cl]
  []
  [rate_SO4]
  []
  [rate_HCO3]
  []
  [rate_H2O]
  []
[]

[Materials]
  [porosity]
    type = PorousFlowPorosityConst
    porosity = 0.01
  []
  [permeability]
    type = PorousFlowPermeabilityConst
    permeability = '1E-14 0 0   0 1E-14 0   0 0 1E-14'
  []
  [thermal_conductivity]
    type = PorousFlowThermalConductivityIdeal
    dry_thermal_conductivity = '2.5 0 0  0 2.5 0  0 0 2.5'
  []
  [rock_heat]
    type = PorousFlowMatrixInternalEnergy
    density = 2750.0
    specific_heat_capacity = 900.0
  []
[]

[Preconditioning]
  active = typically_efficient
  [typically_efficient]
    type = SMP
    full = true
    petsc_options_iname = '-pc_type -pc_hypre_type'
    petsc_options_value = ' hypre    boomeramg'
  []
  [strong]
    type = SMP
    full = true
    petsc_options = '-ksp_diagonal_scale -ksp_diagonal_scale_fix'
    petsc_options_iname = '-pc_type -sub_pc_type -sub_pc_factor_shift_type -pc_asm_overlap'
    petsc_options_value = ' asm      ilu           NONZERO                   2'
  []
  [probably_too_strong]
    type = SMP
    full = true
    petsc_options_iname = '-pc_type -pc_factor_mat_solver_package'
    petsc_options_value = ' lu       mumps'
  []
[]

[Executioner]
  type = Transient
  solve_type = Newton
  end_time = 31536000 #1 year

  [TimeStepper]
    type = SolutionTimeAdaptiveDT
    dt = 500
  []
[]

[Outputs]
  exodus = true
  csv = true
[]

[MultiApps]
  [react]
    type = TransientMultiApp
    input_files = aquifer_geochemistry.i
    clone_master_mesh = true
    execute_on = 'timestep_end'
  []
[]
[Transfers]
  [changes_due_to_flow]
    type = MultiAppCopyTransfer
    direction = to_multiapp
    source_variable = 'rate_H rate_Na rate_K rate_Ca rate_Mg rate_SiO2 rate_Al rate_Cl rate_SO4 rate_HCO3 rate_H2O temperature'
    variable = 'pf_rate_H pf_rate_Na pf_rate_K pf_rate_Ca pf_rate_Mg pf_rate_SiO2 pf_rate_Al pf_rate_Cl pf_rate_SO4 pf_rate_HCO3 pf_rate_H2O temperature'
    multi_app = react
  []
  [massfrac_from_geochem]
    type = MultiAppCopyTransfer
    direction = from_multiapp
    source_variable = 'massfrac_H massfrac_Na massfrac_K massfrac_Ca massfrac_Mg massfrac_SiO2 massfrac_Al massfrac_Cl massfrac_SO4 massfrac_HCO3'
    variable = 'f_H f_Na f_K f_Ca f_Mg f_SiO2 f_Al f_Cl f_SO4 f_HCO3'
    multi_app = react
  []
[]

(test/tests/multiapps/loose_couple_time_adapt/end.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0
  xmax = 1
  ymin = 0
  ymax = 1
[]

[Variables]
  [./u]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = 1
    value = 0
  [../]

  [./right]
    type = DirichletBC
    variable = u
    boundary = 2
    value = 1
  [../]
[]

[MultiApps]
  [./dummy]
    type = TransientMultiApp
    input_files = adaptiveDT.i
    execute_on = timestep_end
  [../]
[]

[Executioner]
  type = Transient
  start_time = 0
  end_time = 0.006
  dt = 0.006
  nl_abs_tol = 1.0e-8
[]

[Outputs]
  exodus = true
  file_base = end
[]

(test/tests/transfers/multiapp_mesh_function_transfer/missing_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    positions = '0.9 0.5 0'
    type = TransientMultiApp
    app_type = MooseTestApp
    input_files = tosub_sub.i
    execute_on = timestep_end
  [../]
[]

[Transfers]
  [./to_sub]
    source_variable = u
    direction = to_multiapp
    variable = transferred_u
    type = MultiAppMeshFunctionTransfer
    multi_app = sub
    error_on_miss = true
  [../]
  [./elemental_to_sub]
    source_variable = u
    direction = to_multiapp
    variable = elemental_transferred_u
    type = MultiAppMeshFunctionTransfer
    multi_app = sub
    error_on_miss = true
  [../]
[]

(modules/functional_expansion_tools/test/tests/errors/multiapp_incompatible_orders.i)

[Mesh]
  type = GeneratedMesh
  dim = 1

  xmin = 0.0
  xmax = 10.0
  nx = 15
[]

[Variables]
  [./m]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[AuxVariables]
  [./s_in]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff_m]
    type = Diffusion
    variable = m
  [../]
  [./time_diff_m]
    type = TimeDerivative
    variable = m
  [../]
  [./s_in]
    type = CoupledForce
    variable = m
    v = s_in
  [../]
[]

[AuxKernels]
  [./reconstruct_s_in]
    type = FunctionSeriesToAux
    variable = s_in
    function = FX_Basis_Value_Main
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    variable = m
    value = 1
  [../]
[]

[BCs]
  [./surround]
    type = DirichletBC
    variable = m
    value = 1
    boundary = 'left right'
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '36'
    physical_bounds = '0.0  10.0'
    x = Legendre
  [../]
[]

[UserObjects]
  [./FX_Value_UserObject_Main]
    type = FXVolumeUserObject
    function = FX_Basis_Value_Main
    variable = m
  [../]
[]

[Postprocessors]
  [./average_value]
    type = ElementAverageValue
    variable = m
  [../]
  [./peak_value]
    type = ElementExtremeValue
    value_type = max
    variable = m
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = multiapp_sub.i
  [../]
[]

[Transfers]
  [./ValueToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Value_UserObject_Main
    multi_app_object_name = FX_Basis_Value_Sub
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
[]

(python/chigger/tests/simple/multiapps.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Problem]
  solve = false
[]

[Executioner]
  type = Transient
  num_steps = 20
  dt = 0.1
  solve_type = PJFNK
[]

[MultiApps]
  [./sub]
    app_type = MooseTestApp
    type = TransientMultiApp
    input_files = sub.i
    output_in_position = true
    positions = '0 0 0
                 0 0 0.25
                 0 0 0.5
                 0 0 0.75
                 0 0 1'
  [../]
[]

(test/tests/multiapps/relaxation/picard_relaxed_array_master.i)

[Mesh]
  [gmg]
    type = GeneratedMeshGenerator
    dim = 2
    nx = 10
    ny = 10
  []
[]

[Variables]
  [u]
    components = 2
  []
[]

[AuxVariables]
  [v]
    components = 2
    initial_condition = '1 1'
  []
  [inverse_v]
    components = 2
    initial_condition = '1 1'
  []
[]

[Kernels]
  [diff]
    type = ArrayDiffusion
    variable = u
    diffusion_coefficient = dc
  []
  [time]
    type = ArrayTimeDerivative
    variable = u
    time_derivative_coefficient = tc
  []
  [force_u]
    type = ArrayCoupledForce
    variable = u
    v = inverse_v
    is_v_array = true
    coef = '1 1'
  []
[]

[AuxKernels]
  [invert_v]
    type = ArrayQuotientAux
    variable = inverse_v
    denominator = v
    numerator = '20 20'
  []
[]

[BCs]
  [left]
    type = ArrayDirichletBC
    variable = u
    boundary = left
    values = '0 0'
  []
  [Neumann_right]
    type = ArrayNeumannBC
    variable = u
    boundary = right
    value = '1 1'
  []
[]

[Materials]
  [dc]
    type = GenericConstantArray
    prop_name = dc
    prop_value = '0.1 0.1'
  []
  [tc]
    type = GenericConstantArray
    prop_name = tc
    prop_value = '1 1'
  []
[]

[Postprocessors]
  [picard_its]
    type = NumPicardIterations
    execute_on = 'initial timestep_end'
  []
[]

[Executioner]
  type = Transient
  num_steps = 4
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  picard_max_its = 30
  nl_abs_tol = 1e-14
  relaxation_factor = 0.8
  relaxed_variables = u
[]

[Outputs]
  exodus = true
  execute_on = 'INITIAL TIMESTEP_END'
[]

[MultiApps]
  [sub]
    type = TransientMultiApp
    execute_on = timestep_begin
    input_files = picard_relaxed_array_sub.i
  []
[]

[Transfers]
  [v_from_sub]
    type = MultiAppCopyTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = v
    variable = v
  []
  [u_to_sub]
    type = MultiAppCopyTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = u
  []
[]

(test/tests/multiapps/check_error/check_error.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 20
  dt = 0.1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[MultiApps]
  [./multi]
    type = TransientMultiApp
    app_type = MooseTestApp
  [../]
[]

[Outputs]
  exodus = true
[]

(test/tests/transfers/multiapp_interpolation_transfer/tosub_master.i)

###########################################################
# This is a test of the Transfer System. This test
# uses the Multiapp System to solve independent problems
# related geometrically. Solutions are then interpolated
# and transferred to a non-aligned domain.
#
# @Requirement F7.20
###########################################################


[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  xmin = .21
  xmax = .79
  displacements = 'disp_x disp_y'
  # The MultiAppInterpolationTransfer object only works with ReplicatedMesh
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./disp_x]
    initial_condition = 0.4
  [../]
  [./disp_y]
  [../]
  [./elemental]
    order = CONSTANT
    family = MONOMIAL
  [../]
[]

[Functions]
  [./x_func]
    type = ParsedFunction
    value = x
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[AuxKernels]
  [./x_func_aux]
    type = FunctionAux
    variable = elemental
    function = x_func
    execute_on = initial
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '0.2 0 0'
    input_files = tosub_sub.i
  [../]
[]

[Transfers]
  [./tosub]
    type = MultiAppInterpolationTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = from_master
  [../]
  [./elemental_tosub]
    type = MultiAppInterpolationTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = elemental_from_master
  [../]
  [./radial_tosub]
    type = MultiAppInterpolationTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = radial_from_master
    interp_type = radial_basis
  [../]
  [./radial_elemental_tosub]
    type = MultiAppInterpolationTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = radial_elemental_from_master
    interp_type = radial_basis
  [../]
  [./displaced_target_tosub]
    type = MultiAppInterpolationTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = displaced_target_from_master
    displaced_target_mesh = true
  [../]
  [./displaced_source_tosub]
    type = MultiAppInterpolationTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = displaced_source_from_master
    displaced_source_mesh = true
  [../]
  [./elemental_to_sub_elemental]
    type = MultiAppInterpolationTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = elemental
    variable = elemental_from_master_elemental
  [../]
  [./elemental_to_sub_nodal]
    type = MultiAppInterpolationTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = elemental
    variable = nodal_from_master_elemental
  [../]
[]

(test/tests/multiapps/multilevel/dt_from_master_sub.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0 0.5 0.5 0'
    input_files = dt_from_master_subsub.i
  [../]
[]

(modules/level_set/test/tests/transfers/markers/multi_level/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  uniform_refine = 2
[]

[Adaptivity]
  marker = marker
  max_h_level = 2
  cycles_per_step = 2
  [./Indicators]
    [./error]
      type = GradientJumpIndicator
      variable = u
    [../]
  [../]
  [./Markers]
    [./marker]
      type = ErrorFractionMarker
      coarsen = 0.4
      refine = 0.5
      indicator = error
    [../]
  [../]
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Problem]
  type = LevelSetProblem
[]

[Executioner]
  type = Transient
  dt = 0.02
  num_steps = 4
  solve_type = 'PJFNK'
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    input_files = 'sub.i'
    execute_on = TIMESTEP_END
  [../]
[]

[Transfers]
  [./marker_to_sub]
    type = LevelSetMeshRefinementTransfer
    multi_app = sub
    source_variable = marker
    variable = marker
    check_multiapp_execute_on = false
  [../]
[]

[Outputs]
  hide = u
  exodus = true
[]

(test/tests/multiapps/restart_multilevel/master2.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0
  ymin = 0
  xmax = 1
  ymax = 1
  nx = 10
  ny = 10
[]

[Functions]
  [./v_fn]
    type = ParsedFunction
    value = t*x
  [../]
  [./ffn]
    type = ParsedFunction
    value = x
  [../]
[]

[AuxVariables]
  [./v]
  [../]
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
  [./ufn]
    type = BodyForce
    variable = u
    function = ffn
  [../]
[]

[BCs]
  [./all]
    type = FunctionDirichletBC
    variable = u
    boundary = 'left right top bottom'
    function = v_fn
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 5
  dt = 0.1
  solve_type = 'PJFNK'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub_app]
    app_type = MooseTestApp
    type = TransientMultiApp
    input_files = 'sub.i'
    execute_on = timestep_end
    positions = '0 -1 0'
  [../]
[]

[Transfers]
  [./from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub_app
    source_variable = u
    variable = v
  [../]
[]

[Problem]
  restart_file_base = master_out_cp/0005
[]

(modules/porous_flow/examples/multiapp_fracture_flow/3dFracture/matrix_app.i)

# 3D matrix app doing thermo-hydro PorousFlow and receiving heat energy via a VectorPostprocessor from the 2D fracture App
[Mesh]
  uniform_refine = 0
  [generate]
    type = GeneratedMeshGenerator
    dim = 3
    nx = 11
    xmin = -10
    xmax = 210
    ny = 9
    ymin = -10
    ymax = 160
    nz = 11
    zmin = -10
    zmax = 210
  []
[]

[GlobalParams]
  PorousFlowDictator = dictator
[]

[Variables]
  [matrix_P]
    scaling = 1E6
  []
  [matrix_T]
    initial_condition = 473
  []
[]

[ICs]
  [frac_P]
    type = FunctionIC
    variable = matrix_P
    function = insitu_pp
  []
[]

[Functions]
  [insitu_pp]
    type = ParsedFunction
    value = '10 - 0.847E-2 * z' # Approximate hydrostatic in MPa
  []
[]

[PorousFlowFullySaturated]
  coupling_type = ThermoHydro
  porepressure = matrix_P
  temperature = matrix_T
  fp = water
  gravity = '0 0 -9.81E-6' # Note the value, because of pressure_unit
  pressure_unit = MPa
[]

[DiracKernels]
  [heat_from_fracture]
    type = ReporterPointSource
    variable = matrix_T
    value_name = heat_transfer_rate/transferred_joules_per_s
    x_coord_name = heat_transfer_rate/x
    y_coord_name = heat_transfer_rate/y
    z_coord_name = heat_transfer_rate/z
  []
[]

[Modules]
  [FluidProperties]
    [water]
      type = SimpleFluidProperties # this is largely irrelevant here since we care about heat conduction only
      thermal_expansion = 0 # to prevent depressurization as the reservoir is cooled
    []
  []
[]

[Materials]
  [porosity]
    type = PorousFlowPorosityConst
    porosity = 1E-3 # small porosity of rock
  []
  [permeability]
    type = PorousFlowPermeabilityConst
    permeability = '1E-18 0 0   0 1E-18 0   0 0 1E-18'
  []
  [internal_energy]
    type = PorousFlowMatrixInternalEnergy
    density = 2700 # kg/m^3
    specific_heat_capacity = 800 # rough guess at specific heat capacity
  []
  [aq_thermal_conductivity]
    type = PorousFlowThermalConductivityIdeal
    dry_thermal_conductivity = '5 0 0  0 5 0  0 0 5'
  []
[]

[VectorPostprocessors]
  [heat_transfer_rate]
    type = ConstantVectorPostprocessor
    vector_names = 'transferred_joules_per_s x y z'
    value = '0; 0; 0; 0'
    outputs = none
  []
[]

[AuxVariables]
  [normal_thermal_conductivity]
    family = MONOMIAL
    order = CONSTANT
  []
  [fracture_normal_x]
    family = MONOMIAL
    order = CONSTANT
    initial_condition = 0
  []
  [fracture_normal_y]
    family = MONOMIAL
    order = CONSTANT
    initial_condition = 1
  []
  [fracture_normal_z]
    family = MONOMIAL
    order = CONSTANT
    initial_condition = 0
  []
  [element_normal_length]
    family = MONOMIAL
    order = CONSTANT
  []
[]

[AuxKernels]
  [normal_thermal_conductivity_auxk]
    type = ConstantAux
    variable = normal_thermal_conductivity
    value = 5 # very simple in this case
  []
  [element_normal_length_auxk]
    type = PorousFlowElementLength
    variable = element_normal_length
    direction = 'fracture_normal_x fracture_normal_y fracture_normal_z'
  []
[]

[Preconditioning]
  [entire_jacobian]
    type = SMP
    full = true
    petsc_options_iname = '-pc_type'
    petsc_options_value = 'lu'
  []
[]

[Executioner]
  type = Transient
  solve_type = NEWTON
  [TimeStepper]
    type = IterationAdaptiveDT
    dt = 1
    growth_factor = 1.1
    optimal_iterations = 4
    timestep_limiting_postprocessor = 1E8
  []
  end_time = 1E8
  nl_abs_tol = 1E-2
[]

[Outputs]
  print_linear_residuals = false
  exodus = false
[]

[MultiApps]
  [fracture_app]
    type = TransientMultiApp
    input_files = fracture_only_aperture_changing.i
    cli_args = 'Outputs/ex/sync_only=false'
    execute_on = TIMESTEP_BEGIN
    sub_cycling = true
### catch_up = true
### max_catch_up_steps = 100
  []
[]

[Transfers]
  [element_normal_length_to_fracture]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = fracture_app
    source_variable = element_normal_length
    variable = enclosing_element_normal_length
  []
  [element_normal_thermal_cond_to_fracture]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = fracture_app
    source_variable = normal_thermal_conductivity
    variable = enclosing_element_normal_thermal_cond
  []
  [T_to_fracture]
    type = MultiAppInterpolationTransfer
    direction = to_multiapp
    multi_app = fracture_app
    source_variable = matrix_T
    variable = transferred_matrix_T
  []
  [normal_x_from_fracture]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = fracture_app
    source_variable = normal_dirn_x
    variable = fracture_normal_x
  []
  [normal_y_from_fracture]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = fracture_app
    source_variable = normal_dirn_y
    variable = fracture_normal_y
  []
  [normal_z_from_fracture]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = fracture_app
    source_variable = normal_dirn_z
    variable = fracture_normal_z
  []
  [heat_from_fracture]
    type = MultiAppReporterTransfer
    direction = from_multiapp
    multi_app = fracture_app
    from_reporters = 'heat_transfer_rate/joules_per_s heat_transfer_rate/x heat_transfer_rate/y heat_transfer_rate/z'
    to_reporters = 'heat_transfer_rate/transferred_joules_per_s heat_transfer_rate/x heat_transfer_rate/y heat_transfer_rate/z'
  []
[]

(test/tests/transfers/transfer_on_final/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [u]
    initial_condition = 1234
  []
  [v]
    initial_condition = 2458
  []
[]

[Problem]
  type = FEProblem
  solve = false
[]

[Executioner]
  type = Transient
  num_steps = 4
  solve_type = 'PJFNK'
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[MultiApps]
  [sub]
    type = TransientMultiApp
    input_files = sub.i
    execute_on = 'INITIAL TIMESTEP_END'
  []
[]

[Transfers]
  [from_sub]
    type = MultiAppCopyTransfer
    direction = from_multiapp
    source_variable = u
    variable = u
    multi_app = sub
    check_multiapp_execute_on = false
    execute_on = 'FINAL'
  []
  [to_sub]
    type = MultiAppCopyTransfer
    direction = to_multiapp
    source_variable = v
    variable = v
    multi_app = sub
    check_multiapp_execute_on = false
    execute_on = 'FINAL'
  []
[]

[Outputs]
  exodus = true
  [final]
    type = Exodus
    execute_on = 'FINAL'
    execute_input_on = 'NONE' # This is needed to avoid problems with creating a file w/o data during --recover testing
  []
[]

(test/tests/multiapps/picard/picard_rel_tol_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./v]
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
  [./force_u]
    type = CoupledForce
    variable = u
    v = v
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 20
  dt = 0.1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  nl_abs_tol = 1e-12
  fixed_point_max_its = 10
  fixed_point_rel_tol = 1e-7
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = picard_sub.i
  [../]
[]

[Transfers]
  [./v_from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = v
    variable = v
  [../]
  [./u_to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = u
  [../]
[]

(test/tests/multiapps/transient_multiapp/dt_from_multi.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 1 # This will be constrained by the multiapp

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub_app]
    positions = '0 0 0  0.5 0.5 0  0.6 0.6 0  0.7 0.7 0'
    type = TransientMultiApp
    input_files = 'dt_from_multi_sub.i'
    app_type = MooseTestApp
  [../]
[]

(test/tests/multiapps/picard/picard_adaptive_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./v]
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
  [./force_u]
    type = CoupledForce
    variable = u
    v = v
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Postprocessors]
  [picard_its]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 20
  dt = 0.1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_abs_tol = 1e-14

  [./TimeStepper]
    type = IterationAdaptiveDT
    dt = 0.1
    # cutback_factor, growth_factor, optimal_iterations, time_dt and time_t added through CLI args
  [../]
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = picard_adaptive_sub.i
  [../]
[]

[Transfers]
  [./v_from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = v
    variable = v
  [../]
  [./u_to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = u
  [../]
[]

(modules/external_petsc_solver/test/tests/external_petsc_problem/petsc_transient_as_master.i)

[Mesh]
  # It is a mirror of PETSc mesh (DMDA)
  type = PETScDMDAMesh
[]

[AuxVariables]
  [./u]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Problem]
  type = ExternalPETScProblem
  sync_variable = u
[]

[Executioner]
  type = Transient
  num_steps = 10
  [./TimeStepper]
    type = ExternalPetscTimeStepper
  [../]
[]

[AuxVariables]
  [pid]
    family = MONOMIAL
    order = CONSTANT
  []
[]

[AuxKernels]
  [pid_aux]
    type = ProcessorIDAux
    variable = pid
    execute_on = 'INITIAL'
  []
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub_app]
    type = TransientMultiApp
    input_files = 'moose_as_sub.i'
    app_type = ExternalPetscSolverTestApp
  [../]
[]

[Transfers]
  [./tosub]
    type = MultiAppMeshFunctionTransfer
    direction = to_multiapp
    multi_app = sub_app
    source_variable = u
    variable = v
  [../]
[]

(test/tests/transfers/reporter_transfer/main.i)

[Mesh/generate]
  type = GeneratedMeshGenerator
  dim = 1
[]

[Problem]
  kernel_coverage_check = false
  solve = false
[]

[VectorPostprocessors]
  [from_main_vpp]
    type = ConstantVectorPostprocessor
    vector_names = 'a b c'
    value = '1 1 1; 2 2 2; 3 3 3'
    execute_on = initial
    #outputs = none
  []
  [to_main_vpp]
    type = ConstantVectorPostprocessor
    vector_names = 'a b c'
    value = '4 4 4; 5 5 5; 6 6 6'
    #outputs = none
  []
[]

[Reporters]
  [from_main_rep]
    type = ConstantReporter
    integer_names = int
    integer_values = 1
    real_names = num
    real_values = 2.0
    real_vector_names = vec
    real_vector_values = '3 4'
    string_names = str
    string_values = 'five'
  []
  [to_main_rep]
    type = ConstantReporter
    integer_names = int
    integer_values = 0
    real_names = num
    real_values = 0.0
    real_vector_names = vec
    real_vector_values = '0'
    string_names = str
    string_values = 'foo'
  []
[]

[MultiApps/sub]
  type = TransientMultiApp
  input_files = 'sub0.i sub1.i'
  positions = '0 0 0 0 0 0'
[]

[Transfers]
  # VPP transfers
  [vpp_to_vpp]
    type = MultiAppReporterTransfer
    to_reporters = 'to_sub_vpp/a to_sub_vpp/b'
    from_reporters = 'from_main_vpp/a from_main_vpp/b'
    direction = to_multiapp
    multi_app = sub
  []
  [vpp_from_vpp]
    type = MultiAppReporterTransfer
    to_reporters = 'to_main_vpp/a to_main_vpp/b'
    from_reporters = 'from_sub_vpp/a from_sub_vpp/b'
    direction = from_multiapp
    multi_app = sub
    subapp_index = 0
  []

  # Vector-VPP transfers
  [vector_to_vpp]
    type = MultiAppReporterTransfer
    to_reporters = 'to_sub_vpp/a'
    from_reporters = 'from_main_rep/vec'
    direction = to_multiapp
    multi_app = sub
    subapp_index = 0
  []
  [vector_from_vpp]
    type = MultiAppReporterTransfer
    to_reporters = 'to_main_rep/vec'
    from_reporters = 'from_sub_vpp/a'
    direction = from_multiapp
    multi_app = sub
    subapp_index = 0
  []

  # Real-PP transfers
  [real_to_pp]
    type = MultiAppReporterTransfer
    to_reporters = 'to_sub_pp/value'
    from_reporters = 'from_main_rep/num'
    direction = to_multiapp
    multi_app = sub
    subapp_index = 0
  []
  [real_from_pp]
    type = MultiAppReporterTransfer
    to_reporters = 'to_main_rep/num'
    from_reporters = 'from_sub_pp/value'
    direction = from_multiapp
    multi_app = sub
    subapp_index = 0
  []

  # Int-Int transfers
  [int_to_int]
    type = MultiAppReporterTransfer
    to_reporters = 'to_sub_rep/int'
    from_reporters = 'from_main_rep/int'
    direction = to_multiapp
    multi_app = sub
    subapp_index = 0
  []
  [int_from_int]
    type = MultiAppReporterTransfer
    to_reporters = 'to_main_rep/int'
    from_reporters = 'from_sub_rep/int'
    direction = from_multiapp
    multi_app = sub
    subapp_index = 0
  []

  # String-String transfers
  [string_to_string]
    type = MultiAppReporterTransfer
    to_reporters = 'to_sub_rep/str'
    from_reporters = 'from_main_rep/str'
    direction = to_multiapp
    multi_app = sub
    subapp_index = 0
  []
  [string_from_string]
    type = MultiAppReporterTransfer
    to_reporters = 'to_main_rep/str'
    from_reporters = 'from_sub_rep/str'
    direction = from_multiapp
    multi_app = sub
    subapp_index = 0
  []
[]

[Executioner]
  type = Transient
  num_steps = 1
[]

[Outputs]
  [out]
    type = JSON
    execute_system_information_on = NONE
    vectorpostprocessors_as_reporters = true
  []
  execute_on = timestep_end
[]

(test/tests/multiapps/loose_couple_time_adapt/begin.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0
  xmax = 1
  ymin = 0
  ymax = 1
[]

[Variables]
  [./u]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = 1
    value = 0
  [../]

  [./right]
    type = DirichletBC
    variable = u
    boundary = 2
    value = 1
  [../]
[]

[MultiApps]
  [./dummy]
    type = TransientMultiApp
    input_files = adaptiveDT.i
    execute_on = timestep_begin
  [../]
[]

[Executioner]
  type = Transient
  start_time = 0
  end_time = 0.006
  dt = 0.006
  nl_abs_tol = 1.0e-8
[]

[Outputs]
  exodus = true
  file_base = begin
[]

(test/tests/multiapps/multiple_position_files/multiple_position_files.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 2
  dt = 0.1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./multi]
    type = TransientMultiApp
    app_type = MooseTestApp
    input_files = 'sub1.i sub2.i'
    positions_file = 'position1.txt position2.txt'
    output_in_position = true
  [../]
[]

(tutorials/darcy_thermo_mech/step10_multiapps/problems/step10.i)

[GlobalParams]
  displacements = 'disp_r disp_z'
[]

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 100
  ymax = 0.304 # Length of test chamber
  xmax = 0.0257 # Test chamber radius
[]

[Variables]
  [pressure]
  []
  [temperature]
    initial_condition = 300 # Start at room temperature
  []
[]

[AuxVariables]
  [k_eff]
    initial_condition = 15.0 # water at 20C
  []
  [velocity]
    order = CONSTANT
    family = MONOMIAL_VEC
  []
[]

[Modules/TensorMechanics/Master]
  [all]
    # This block adds all of the proper Kernels, strain calculators, and Variables
    # for TensorMechanics in the correct coordinate system (autodetected)
    add_variables = true
    strain = FINITE
    eigenstrain_names = eigenstrain
    use_automatic_differentiation = true
    generate_output = 'vonmises_stress elastic_strain_xx elastic_strain_yy strain_xx strain_yy'
  []
[]

[Kernels]
  [darcy_pressure]
    type = DarcyPressure
    variable = pressure
  []
  [heat_conduction]
    type = ADHeatConduction
    variable = temperature
  []
  [heat_conduction_time_derivative]
    type = ADHeatConductionTimeDerivative
    variable = temperature
  []
  [heat_convection]
    type = DarcyAdvection
    variable = temperature
    pressure = pressure
  []
[]

[AuxKernels]
  [velocity]
    type = DarcyVelocity
    variable = velocity
    execute_on = timestep_end
    pressure = pressure
  []
[]

[BCs]
  [inlet]
    type = DirichletBC
    variable = pressure
    boundary = bottom
    value = 4000 # (Pa) From Figure 2 from paper.  First data point for 1mm spheres.
  []
  [outlet]
    type = DirichletBC
    variable = pressure
    boundary = top
    value = 0 # (Pa) Gives the correct pressure drop from Figure 2 for 1mm spheres
  []
  [inlet_temperature]
    type = FunctionDirichletBC
    variable = temperature
    boundary = bottom
    function = 'if(t<0,350+50*t,350)'
  []
  [outlet_temperature]
    type = HeatConductionOutflow
    variable = temperature
    boundary = top
  []
  [hold_inlet]
    type = DirichletBC
    variable = disp_z
    boundary = bottom
    value = 0
  []
  [hold_center]
    type = DirichletBC
    variable = disp_r
    boundary = left
    value = 0
  []
  [hold_outside]
    type = DirichletBC
    variable = disp_r
    boundary = right
    value = 0
  []
[]

[Materials]
  viscosity_file = data/water_viscosity.csv
  density_file = data/water_density.csv
  specific_heat_file = data/water_specific_heat.csv
  thermal_expansion_file = data/water_thermal_expansion.csv
  [column]
    type = PackedColumn
    temperature = temperature
    radius = 1
    thermal_conductivity = k_eff # Use the AuxVariable instead of calculating
    fluid_viscosity_file = ${viscosity_file}
    fluid_density_file = ${density_file}
    fluid_specific_heat_file = ${specific_heat_file}
    fluid_thermal_expansion_file = ${thermal_expansion_file}
  []

  [elasticity_tensor]
    type = ADComputeIsotropicElasticityTensor
    youngs_modulus = 200e9 # (Pa) from wikipedia
    poissons_ratio = .3 # from wikipedia
  []
  [elastic_stress]
    type = ADComputeFiniteStrainElasticStress
  []
  [thermal_strain]
    type = ADComputeThermalExpansionEigenstrain
    stress_free_temperature = 300
    thermal_expansion_coeff = 1e-6
    eigenstrain_name = eigenstrain
    temperature = temperature
  []
[]

[Postprocessors]
  [average_temperature]
    type = ElementAverageValue
    variable = temperature
  []
[]

[Executioner]
  type = Transient
  start_time = -1
  end_time = 200
  steady_state_tolerance = 1e-7
  steady_state_detection = true
  dt = 0.25
  solve_type = PJFNK
  automatic_scaling = true
  compute_scaling_once = false
  petsc_options_iname = '-pc_type -pc_hypre_type -ksp_gmres_restart'
  petsc_options_value = 'hypre boomeramg 500'
  line_search = none
  [TimeStepper]
    type = FunctionDT
    function = 'if(t<0,0.1,0.25)'
  []
[]


[MultiApps]
  [micro]
    type = TransientMultiApp
    app_type = DarcyThermoMechApp
    positions = '0.01285 0.0    0
                 0.01285 0.0608 0
                 0.01285 0.1216 0
                 0.01285 0.1824 0
                 0.01285 0.2432 0
                 0.01285 0.304  0'
    input_files = step10_micro.i
    execute_on = 'timestep_end'
  []
[]

[Transfers]
  [keff_from_sub]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = from_multiapp
    multi_app = micro
    variable = k_eff
    power = 1
    postprocessor = k_eff
    execute_on = 'timestep_end'
  []
  [temperature_to_sub]
    type = MultiAppVariableValueSamplePostprocessorTransfer
    direction = to_multiapp
    multi_app = micro
    source_variable = temperature
    postprocessor = temperature_in
    execute_on = 'timestep_end'
  []
[]

[Controls]
  [multiapp]
    type = TimePeriod
    disable_objects = 'MultiApps::micro Transfers::keff_from_sub Transfers::temperature_to_sub'
    start_time = '0'
    execute_on = 'initial'
  []
[]

[Outputs]
  [out]
    type = Exodus
    elemental_as_nodal = true
  []
[]

(test/tests/outputs/console/multiapp/picard_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./v]
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
  [./force_u]
    type = CoupledForce
    variable = u
    v = v
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Postprocessors]
  [picard_its]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_abs_tol = 1e-14
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = picard_sub.i
  [../]
[]

[Transfers]
  [./v_from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = v
    variable = v
  [../]
  [./u_to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = u
  [../]
[]

(test/tests/multiapps/positions_from_file/dt_from_multi.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 1 # This will be constrained by the multiapp

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub_app]
    positions_file = positions.txt
    type = TransientMultiApp
    input_files = 'dt_from_multi_sub.i'
    app_type = MooseTestApp
  [../]
[]

(modules/functional_expansion_tools/test/tests/standard_use/volume_coupled.i)

[Mesh]
  type = GeneratedMesh
  dim = 1

  xmin = 0.0
  xmax = 10.0
  nx = 15
[]

[Variables]
  [./m]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[AuxVariables]
  [./s_in]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff_m]
    type = Diffusion
    variable = m
  [../]
  [./time_diff_m]
    type = TimeDerivative
    variable = m
  [../]
  [./s_in]
    type = CoupledForce
    variable = m
    v = s_in
  [../]
[]

[AuxKernels]
  [./reconstruct_s_in]
    type = FunctionSeriesToAux
    variable = s_in
    function = FX_Basis_Value_Main
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    variable = m
    value = 1
  [../]
[]

[BCs]
  [./surround]
    type = DirichletBC
    variable = m
    value = 1
    boundary = 'left right'
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '3'
    physical_bounds = '0.0  10.0'
    x = Legendre
  [../]
[]

[UserObjects]
  [./FX_Value_UserObject_Main]
    type = FXVolumeUserObject
    function = FX_Basis_Value_Main
    variable = m
  [../]
[]

[Postprocessors]
  [./average_value]
    type = ElementAverageValue
    variable = m
  [../]
  [./peak_value]
    type = ElementExtremeValue
    value_type = max
    variable = m
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = volume_sub.i
  [../]
[]

[Transfers]
  [./ValueToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Value_UserObject_Main
    multi_app_object_name = FX_Basis_Value_Sub
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
[]

(test/tests/multiapps/sub_cycling_failure/failure_with_max_procs_set.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 4
  dt = 0.1

  solve_type = 'PJFNK'

  petsc_options = '-snes_ksp_ew'
  petsc_options_iname = '-pc_type -pc_factor_mat_solver_package'
  petsc_options_value = ' lu       superlu_dist                '
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '0 0 0'
    input_files = sub.i
    sub_cycling = true
    max_procs_per_app = 1
  [../]
[]

(test/tests/transfers/multiapp_postprocessor_interpolation_transfer/radial_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./from_sub]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    positions = '0.2 0.2 0 0.7 0.7 0'
    type = TransientMultiApp
    app_type = MooseTestApp
    input_files = 'sub0.i sub1.i'
  [../]
[]

[Transfers]
  [./pp_transfer]
    direction = from_multiapp
    postprocessor = average
    variable = from_sub
    type = MultiAppPostprocessorInterpolationTransfer
    multi_app = sub
    interp_type = radial_basis
    radius = 1.5
  [../]
[]

(modules/functional_expansion_tools/examples/3D_volumetric_cylindrical_subapp_mesh_refine/main.i)

# Derived from the example '3D_volumetric_cylindrical' with the following differences:
#
#   1) The model mesh is refined in the MasterApp by 1
#   2) Mesh adaptivity is enabled for the SubApp
#   3) Output from the SubApp is enabled so that the mesh changes can be visualized
[Mesh]
  type = FileMesh
  file = cyl-tet.e
  uniform_refine = 1
[]

[Variables]
  [./m]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[AuxVariables]
  [./s_in]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff_m]
    type = HeatConduction
    variable = m
  [../]
  [./time_diff_m]
    type = HeatConductionTimeDerivative
    variable = m
  [../]
  [./s_in] # Add in the contribution from the SubApp
    type = CoupledForce
    variable = m
    v = s_in
  [../]
[]

[AuxKernels]
  [./reconstruct_s_in]
    type = FunctionSeriesToAux
    variable = s_in
    function = FX_Basis_Value_Main
  [../]
[]

[Materials]
  [./Unobtanium]
    type = GenericConstantMaterial
    prop_names =  'thermal_conductivity specific_heat density'
    prop_values = '1.0                  1.0           1.0' # W/(cm K), J/(g K), g/cm^3
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    variable = m
    value = 1
  [../]
[]

[BCs]
  [./surround]
    type = DirichletBC
    variable = m
    value = 1
    boundary = 'top bottom outside'
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = CylindricalDuo
    orders = '5   3' # Axial first, then (r, t) FX
    physical_bounds = '-2.5 2.5   0 0 1' # z_min z_max   x_center y_center radius
    z = Legendre # Axial in z
    disc = Zernike # (r, t) default to unit disc in x-y plane
  [../]
[]

[UserObjects]
  [./FX_Value_UserObject_Main]
    type = FXVolumeUserObject
    function = FX_Basis_Value_Main
    variable = m
  [../]
[]

[Postprocessors]
  [./average_value]
    type = ElementAverageValue
    variable = m
  [../]
  [./peak_value]
    type = ElementExtremeValue
    value_type = max
    variable = m
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = sub.i
    output_sub_cycles = true
  [../]
[]

[Transfers]
  [./ValueToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Value_UserObject_Main
    multi_app_object_name = FX_Basis_Value_Sub
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
[]

(tutorials/tutorial02_multiapps/step02_transfers/02_master_nearestnode.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [u]
  []
[]

[AuxVariables]
  [tv]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
  [force]
    type = BodyForce
    variable = u
    value = 1.
  []
  [td]
    type = TimeDerivative
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Executioner]
  type = Transient
  end_time = 2
  dt = 0.2

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub_app]
    type = TransientMultiApp
    positions = '0.1 0.1 0  0.4 0.4 0  0.7 0.7 0'
    input_files = '02_sub_nearestnode.i'
    execute_on = timestep_end
    output_in_position = true
  []
[]

[Transfers]
  [push_u]
    type = MultiAppNearestNodeTransfer

    multi_app = sub_app

    # Transfer to the sub-app from this app
    direction = to_multiapp

    # The name of the variable in this app
    source_variable = u

    # The name of the auxiliary variable in the sub-app
    variable = tu
  []
[]

(test/tests/restart/restart_transient_from_transient/restart_trans_with_2subs.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  parallel_type = 'replicated'
[]

[Problem]
  restart_file_base = pseudo_trans_with_2subs_out_cp/LATEST
[]

[AuxVariables]
  [Tf]
  []
[]

[Variables]
  [power_density]
  []
[]

[Functions]
  [pwr_func]
    type = ParsedFunction
    value = '1e3*x*(1-x)+5e2' # increase this function to drive transient
  []
[]

[Kernels]
  [timedt]
    type = TimeDerivative
    variable = power_density
  []

  [diff]
    type = Diffusion
    variable = power_density
  []

  [coupledforce]
    type = BodyForce
    variable = power_density
    function = pwr_func
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = power_density
    boundary = left
    value = 50
  []
  [right]
    type = DirichletBC
    variable = power_density
    boundary = right
    value = 1e3
  []
[]

[Postprocessors]
  [pwr_avg]
    type = ElementAverageValue
    block = '0'
    variable = power_density
    execute_on = 'initial timestep_end'
  []
  [temp_avg]
    type = ElementAverageValue
    variable = Tf
    block = '0'
    execute_on = 'initial timestep_end'
  []
  [temp_max]
    type = ElementExtremeValue
    value_type = max
    variable = Tf
    block = '0'
    execute_on = 'initial timestep_end'
  []
  [temp_min]
    type = ElementExtremeValue
    value_type = min
    variable = Tf
    block = '0'
    execute_on = 'initial timestep_end'
  []
[]

[Executioner]
  type = Transient
  start_time = 0
  end_time = 3
  dt = 1.0

  petsc_options_iname = '-pc_type -pc_hypre_type -ksp_gmres_restart '
  petsc_options_value = 'hypre boomeramg 100'

  nl_abs_tol = 1e-8
  nl_rel_tol = 1e-12

  line_search = none
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0   0 0
                 0.5 0 0'
    input_files  = restart_trans_with_2subs_sub.i
    execute_on = 'timestep_end'
  [../]
[]

[Transfers]
  [p_to_sub]
    type = MultiAppProjectionTransfer
    direction = to_multiapp
    source_variable = power_density
    variable = power_density
    multi_app = sub
    execute_on = 'timestep_end'
  []
  [t_from_sub]
    type = MultiAppInterpolationTransfer
    direction = from_multiapp
    source_variable = temp
    variable = Tf
    multi_app = sub
    execute_on = 'timestep_end'
  []
[]

[Outputs]
  exodus = true
  csv = true
  perf_graph = true
[]

(test/tests/multiapps/restart/master2.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0
  ymin = 0
  xmax = 1
  ymax = 1
  nx = 10
  ny = 10
[]

[Functions]
  [./v_fn]
    type = ParsedFunction
    value = t*x
  [../]
  [./ffn]
    type = ParsedFunction
    value = x
  [../]
[]

[AuxVariables]
  [./v]
  [../]
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
  [./ufn]
    type = BodyForce
    variable = u
    function = ffn
  [../]
[]

[BCs]
  [./all]
    type = FunctionDirichletBC
    variable = u
    boundary = 'left right top bottom'
    function = v_fn
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 5
  dt = 0.1
  solve_type = 'PJFNK'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub_app]
    app_type = MooseTestApp
    type = TransientMultiApp
    input_files = 'sub2.i'
    execute_on = timestep_end
    positions = '0 -1 0'
  [../]
[]

[Transfers]
  [./from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub_app
    source_variable = u
    variable = v
  [../]
[]

[Problem]
  restart_file_base = master_out_cp/0005
[]

(test/tests/multiapps/transient_multiapp/dt_from_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.2

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub_app]
    type = TransientMultiApp
    app_type = MooseTestApp
    input_files = 'dt_from_master_sub.i'
    positions = '0   0   0
                 0.5 0.5 0
                 0.6 0.6 0
                 0.7 0.7 0'
  []
[]

(test/tests/parser/cli_multiapp_single/dt_from_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.2

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  execute_on = 'timestep_end'
  exodus = true
[]

[MultiApps]
  [./sub_app]
    positions = '0 0 0  0.5 0.5 0  0.6 0.6 0  0.7 0.7 0'
    type = TransientMultiApp
    input_files = 'dt_from_master_sub.i'
    app_type = MooseTestApp
  [../]
[]

(test/tests/multiapps/sub_cycling/master_short.i)

# The master app will do 4 timesteps, while sub app only 2. This tests that the sub app will not
# do anything during the inactive period.

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  end_time = 0.4
  dt = 0.1

  solve_type = 'PJFNK'
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '0 0 0'
    input_files = sub_short.i
    sub_cycling = true
  [../]
[]

(modules/functional_expansion_tools/examples/2D_interface_different_submesh/main.i)

# Derived from the example '2D_interface' with the following differences:
#
#   1) The number of y divisions in the sub app is not the same as the master app
#   2) The subapp mesh is skewed in y
#   3) The Functional Expansion order for the flux term was increased to 7
[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0.0
  xmax = 0.4
  nx = 6
  ymin = 0.0
  ymax = 10.0
  ny = 20
[]

[Variables]
  [./m]
  [../]
[]

[Kernels]
  [./diff_m]
    type = HeatConduction
    variable = m
  [../]
  [./time_diff_m]
    type = HeatConductionTimeDerivative
    variable = m
  [../]
  [./source_m]
    type = BodyForce
    variable = m
    value = 100
  [../]
[]

[Materials]
  [./Impervium]
    type = GenericConstantMaterial
    prop_names =  'thermal_conductivity specific_heat density'
    prop_values = '0.00001              50.0          100.0' # W/(cm K), J/(g K), g/cm^3
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    value = 2
    variable = m
  [../]
[]

[BCs]
  [./interface_value]
    type = FXValueBC
    variable = m
    boundary = right
    function = FX_Basis_Value_Main
  [../]
  [./interface_flux]
    type = FXFluxBC
    boundary = right
    variable = m
    function = FX_Basis_Flux_Main
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '4'
    physical_bounds = '0.0 10'
    y = Legendre
  [../]
  [./FX_Basis_Flux_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '7'
    physical_bounds = '0.0 10'
    y = Legendre
  [../]
[]

[UserObjects]
  [./FX_Flux_UserObject_Main]
    type = FXBoundaryFluxUserObject
    function = FX_Basis_Flux_Main
    variable = m
    boundary = right
    diffusivity = thermal_conductivity
  [../]
[]

[Postprocessors]
  [./average_interface_value]
    type = SideAverageValue
    variable = m
    boundary = right
  [../]
  [./total_flux]
    type = SideDiffusiveFluxIntegral
    variable = m
    boundary = right
    diffusivity = thermal_conductivity
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 1.0
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = sub.i
    sub_cycling = true
  [../]
[]

[Transfers]
  [./FluxToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Flux_UserObject_Main
    multi_app_object_name = FX_Basis_Flux_Sub
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
  [./FluxToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Flux_Main
    multi_app_object_name = FX_Flux_UserObject_Sub
  [../]
[]

(modules/combined/examples/geochem-porous_flow/geotes_2D/exchanger_un_quartz.i)

# Model of the heat-exchanger
# The input fluid to the heat exchanger is determined by AuxVariables called production_temperature, production_rate_Na, production_rate_Cl, production_rate_SiO2 and production_rate_H2O.  These come from Postprocessors in the porous-flow simulation that measure the fluid composition at the production well.
# Given the input fluid, the exchanger cools/heats the fluid, removing any precipitates, and injects fluid back to the porous-flow simulation at temperature output_temperature and composition given by massfrac_Na, etc.
# In the absence of data concerning Quartz precipitation rates in heat exchangers, do not treat Quartz as kinetic
[GlobalParams]
  point = '0 0 0'
  reactor = reactor
[]

[TimeDependentReactionSolver]
  model_definition = definition
  include_moose_solve = false
  geochemistry_reactor_name = reactor
  charge_balance_species = "Cl-"
  swap_out_of_basis = "SiO2(aq)"
  swap_into_basis = "QuartzUnlike"
  constraint_species = "H2O              Na+                Cl-                QuartzUnlike"
  constraint_value = "  1.0E-2           0.1E-2             0.1E-2             1E-10"
  constraint_meaning = "kg_solvent_water bulk_composition bulk_composition free_mineral"
  constraint_unit = "   kg               moles              moles              moles"
  initial_temperature = 50.0
  mode = 4
  temperature = 200
  cold_temperature = 40.0
  source_species_names = 'H2O    Na+   Cl-   SiO2(aq)'
  source_species_rates = 'production_rate_H2O production_rate_Na production_rate_Cl production_rate_SiO2'
  ramp_max_ionic_strength_initial = 0 # max_ionic_strength in such a simple problem does not need ramping
  add_aux_pH = false # there is no H+ in this system
  evaluate_kinetic_rates_always = true # implicit time-marching used for stability
  execute_console_output_on = '' # only CSV output used in this example
[]

[UserObjects]
  [definition]
    type = GeochemicalModelDefinition
    database_file = "small_database.json"
    basis_species = "H2O SiO2(aq) Na+ Cl-"
    equilibrium_minerals = "QuartzUnlike"
  []
[]


[Executioner]
  type = Transient
  dt = 1E5
  end_time = 2E6 #7.76E6 # 90 days
[]

[AuxVariables]
  [production_temperature]
    initial_condition = 50 # the production_T Transfer lags one timestep behind for some reason, so give this a reasonable initial condition
  []
  [transported_H2O]
  []
  [transported_Na]
  []
  [transported_Cl]
  []
  [transported_SiO2]
  []
  [transported_mass]
  []
  [massfrac_H2O]
  []
  [massfrac_Na]
  []
  [massfrac_Cl]
  []
  [massfrac_SiO2]
  []
  [dumped_quartz]
  []
  [production_rate_H2O]
    initial_condition = 5.518533e+01 # the production_H2O Transfer lags one timestep behind for some reason (when the porous_flow simulation has finished, it correctly computes mole_rate_H2O_produced, but the Transfer gets the mole_rate_H2O_produced from the previous timestep), so give this a reasonable initial condition, otherwise this will be zero at the start of the simulation!
  []
  [production_rate_Na]
    initial_condition = 9.943302e-02
  []
  [production_rate_Cl]
    initial_condition = 9.943302e-02
  []
  [production_rate_SiO2]
    initial_condition = 2.340931e-04
  []
[]
[AuxKernels]
  [transported_H2O]
    type = GeochemistryQuantityAux
    variable = transported_H2O
    species = H2O
    quantity = transported_moles_in_original_basis
  []
  [transported_Na]
    type = GeochemistryQuantityAux
    variable = transported_Na
    species = Na+
    quantity = transported_moles_in_original_basis
  []
  [transported_Cl]
    type = GeochemistryQuantityAux
    variable = transported_Cl
    species = Cl-
    quantity = transported_moles_in_original_basis
  []
  [transported_SiO2]
    type = GeochemistryQuantityAux
    variable = transported_SiO2
    species = 'SiO2(aq)'
    quantity = transported_moles_in_original_basis
  []
  [transported_mass]
    type = ParsedAux
    args = 'transported_H2O transported_Na transported_Cl transported_SiO2'
    variable = transported_mass
    function = 'transported_H2O * 18.0152 + transported_Na * 22.9898 + transported_Cl * 35.453 + transported_SiO2 * 60.0843'
  []
  [massfrac_H2O]
    type = ParsedAux
    args = 'transported_mass transported_H2O'
    variable = massfrac_H2O
    function = '18.0152 * transported_H2O / transported_mass'
  []
  [massfrac_Na]
    type = ParsedAux
    args = 'transported_mass transported_Na'
    variable = massfrac_Na
    function = '22.9898 * transported_Na / transported_mass'
  []
  [massfrac_Cl]
    type = ParsedAux
    args = 'transported_mass transported_Cl'
    variable = massfrac_Cl
    function = '35.453 * transported_Cl / transported_mass'
  []
  [massfrac_SiO2]
    type = ParsedAux
    args = 'transported_mass transported_SiO2'
    variable = massfrac_SiO2
    function = '60.0843 * transported_SiO2 / transported_mass'
  []
  [dumped_quartz]
    type = GeochemistryQuantityAux
    variable = dumped_quartz
    species = QuartzUnlike
    quantity = moles_dumped
  []
[]
[Postprocessors]
  [cumulative_moles_precipitated_quartz]
    type = PointValue
    variable = dumped_quartz
  []
  [production_temperature]
    type = PointValue
    variable = production_temperature
  []
  [mass_heated_this_timestep]
    type = PointValue
    variable = transported_mass
  []
[]
[Outputs]
  csv = true
[]

[MultiApps]
  [porous_flow_sim]
    type = TransientMultiApp
    input_files = porous_flow.i
    cli_args = 'MultiApps/react/input_files=aquifer_un_quartz_geochemistry.i'
    execute_on = 'timestep_end'
  []
[]

[Transfers]
  [injection_T]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'solution_temperature'
    variable = 'injection_temperature'
  []
  [injection_Na]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_Na'
    variable = 'injection_rate_massfrac_Na'
  []
  [injection_Cl]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_Cl'
    variable = 'injection_rate_massfrac_Cl'
  []
  [injection_SiO2]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_SiO2'
    variable = 'injection_rate_massfrac_SiO2'
  []
  [injection_H2O]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_H2O'
    variable = 'injection_rate_massfrac_H2O'
  []

  [production_T]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = production_temperature
    variable = production_temperature
  []
  [production_Na]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_Na_produced
    variable = production_rate_Na
  []
  [production_Cl]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_Cl_produced
    variable = production_rate_Cl
  []
  [production_SiO2]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_SiO2_produced
    variable = production_rate_SiO2
  []
  [production_H2O]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_H2O_produced
    variable = production_rate_H2O
  []
[]

(test/tests/multiapps/cliargs_from_file/cliargs_master_inline.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 1 # This will be constrained by the multiapp

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub_app]
    positions = '0 0 0  0.5 0.5 0
                 0.6 0.6 0  0.7 0.7 0'
    cli_args_files = cliargs.txt
    type = TransientMultiApp
    input_files = 'cliargs_sub.i'
    app_type = MooseTestApp
  [../]
[]

(test/tests/transfers/multiapp_userobject_transfer/tosub_displaced_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 3
  nx = 20
  ny = 20
  nz = 20
  # The MultiAppUserObjectTransfer object only works with ReplicatedMesh
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./layered_average_value]
    order = CONSTANT
    family = MONOMIAL
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[AuxKernels]
  [./layered_aux]
    type = SpatialUserObjectAux
    variable = layered_average_value
    execute_on = timestep_end
    user_object = layered_average
  [../]
[]

[BCs]
  [./bottom]
    type = DirichletBC
    variable = u
    boundary = bottom
    value = 0
  [../]
  [./top]
    type = DirichletBC
    variable = u
    boundary = top
    value = 1
  [../]
[]

[UserObjects]
  [./layered_average]
    type = LayeredAverage
    variable = u
    direction = y
    num_layers = 4
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub_app]
    execute_on = timestep_end
    positions = '0 0 0'
    type = TransientMultiApp
    input_files = tosub_displaced_sub.i
    app_type = MooseTestApp
  [../]
[]

[Transfers]
  [./layered_transfer]
    direction = to_multiapp
    user_object = layered_average
    variable = multi_layered_average
    type = MultiAppUserObjectTransfer
    multi_app = sub_app
    displaced_target_mesh = true
  [../]
  [./element_layered_transfer]
    direction = to_multiapp
    user_object = layered_average
    variable = element_multi_layered_average
    type = MultiAppUserObjectTransfer
    multi_app = sub_app
    displaced_target_mesh = true
  [../]
[]

(test/tests/transfers/transfer_with_reset/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  # This test currently diffs when run in parallel with DistributedMesh enabled,
  # most likely due to the fact that it uses some geometric search stuff.
  # For more information, see #2121.
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./t]
  [../]
  [./u_from_sub]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.01

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '0 0 0'
    input_files = sub.i
    reset_apps = 0
    reset_time = 0.05
  [../]
[]

[Transfers]
  [./t_from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = t
    variable = t
  [../]
  [./u_from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u
    variable = u_from_sub
  [../]
  [./u_to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = u_from_master
  [../]
[]

(test/tests/transfers/multiapp_conservative_transfer/master_userobject.i)

[Mesh]
  type = GeneratedMesh
  dim = 3
  nx = 20
  ny = 20
  nz = 20
  # The MultiAppUserObjectTransfer object only works with ReplicatedMesh
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./multi_layered_average]
  [../]
  [./element_multi_layered_average]
    order = CONSTANT
    family = MONOMIAL
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 0.001 # This will be constrained by the multiapp

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  l_tol = 1e-8
  nl_rel_tol = 1e-10
[]


[Outputs]
  exodus = true
  csv = true
[]

[VectorPostprocessors]
  [to_nearest_point]
    type = NearestPointIntegralVariablePostprocessor
    variable = multi_layered_average
    points = '0.3 0.1 0.3 0.7 0.1 0.3'
    execute_on = 'transfer'
  []

  [to_nearest_point_element]
    type = NearestPointIntegralVariablePostprocessor
    variable = element_multi_layered_average
    points = '0.3 0.1 0.3 0.7 0.1 0.3'
    execute_on = 'transfer'
  []
[]

[MultiApps]
  [./sub_app]
    positions = '0.3 0.1 0.3 0.7 0.1 0.3'
    type = TransientMultiApp
    input_files = sub_userobject.i
    app_type = MooseTestApp
  [../]
[]

[Transfers]
  [./layered_transfer]
    direction = from_multiapp
    user_object = layered_average
    variable = multi_layered_average
    type = MultiAppUserObjectTransfer
    multi_app = sub_app

    from_postprocessors_to_be_preserved  = 'from_postprocessor'
    to_postprocessors_to_be_preserved  = 'to_nearest_point'
  [../]
  [./element_layered_transfer]
    direction = from_multiapp
    user_object = layered_average
    variable = element_multi_layered_average
    type = MultiAppUserObjectTransfer
    multi_app = sub_app

    from_postprocessors_to_be_preserved  = 'from_postprocessor'
    to_postprocessors_to_be_preserved  = 'to_nearest_point_element'
  [../]
[]

(test/tests/multiapps/picard_multilevel/multilevel_dt_rejection/picard_sub.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./v]
  [../]
[]

[AuxVariables]
  [./v2]
  [../]
  [./v3]
  [../]
  [./w]
  [../]
[]

[AuxKernels]
  [./set_w]
    type = NormalizationAux
    variable = w
    source_variable = v
    normal_factor = 0.1
  [../]
[]

[Kernels]
  [./diff_v]
    type = Diffusion
    variable = v
  [../]
  [./coupled_force]
    type = CoupledForce
    variable = v
    v = v2
  [../]
  [./coupled_force2]
    type = CoupledForce
    variable = v
    v = v3
  [../]
  [./td_v]
    type = TimeDerivative
    variable = v
  [../]
[]

[BCs]
  [./left_v]
    type = FunctionDirichletBC
    variable = v
    boundary = left
    function = func
  [../]
  [./right_v]
    type = DirichletBC
    variable = v
    boundary = right
    value = 0
  [../]
[]

[Functions]
  [func]
    type = ParsedFunction
    value = 'if(t < 2.5, 1, 1 / t)'
  []
[]

[Postprocessors]
  [picard_its]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  [../]
  [master_time]
    type = Receiver
    execute_on = 'timestep_end'
  []
  [master_dt]
    type = Receiver
    execute_on = 'timestep_end'
  []
  [time]
    type = TimePostprocessor
    execute_on = 'timestep_end'
  []
  [dt]
    type = TimestepSize
    execute_on = 'timestep_end'
  []
[]

[Executioner]
  type = Transient
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 2 # deliberately make it fail at 2 to test the time step rejection behavior
  nl_rel_tol = 1e-5 # loose enough to force multiple Picard iterations on this example
  l_tol = 1e-5 # loose enough to force multiple Picard iterations on this example
  fixed_point_rel_tol = 1e-8
  num_steps = 2
[]

[MultiApps]
  [./sub2]
    type = TransientMultiApp
    positions = '0 0 0'
    input_files = picard_sub2.i
    execute_on = timestep_end
  [../]
[]

[Transfers]
  [./v_to_v3]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub2
    source_variable = v
    variable = v3
  [../]
  [./w]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub2
    source_variable = w
    variable = w
  [../]
  [time_to_sub]
    type = MultiAppPostprocessorTransfer
    from_postprocessor = time
    to_postprocessor = sub_time
    direction = to_multiapp
    multi_app = sub2
  []
  [dt_to_sub]
    type = MultiAppPostprocessorTransfer
    from_postprocessor = dt
    to_postprocessor = sub_dt
    direction = to_multiapp
    multi_app = sub2
  []
  [matser_time_to_sub]
    type = MultiAppPostprocessorTransfer
    from_postprocessor = time
    to_postprocessor = master_time
    direction = to_multiapp
    multi_app = sub2
  []
  [master_dt_to_sub]
    type = MultiAppPostprocessorTransfer
    from_postprocessor = dt
    to_postprocessor = master_dt
    direction = to_multiapp
    multi_app = sub2
  []
[]

(modules/external_petsc_solver/test/tests/external_petsc_problem/moose_as_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./v]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
  [./cf]
    type = CoupledForce
    coef = 10000
    variable = u
    v=v
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.2

  solve_type = 'PJFNK'

  fixed_point_max_its = 10
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-12

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[Postprocessors]
  [./picard_its]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  [../]
[]

[MultiApps]
  [./sub_app]
    type = TransientMultiApp
    input_files = 'petsc_transient_as_sub.i'
    app_type = ExternalPetscSolverApp
    library_path = '../../../../external_petsc_solver/lib'
  [../]
[]

[Transfers]
  [./fromsub]
    type = MultiAppMeshFunctionTransfer
    direction = from_multiapp
    multi_app = sub_app
    source_variable = u
    variable = v
  [../]
[]

(test/tests/transfers/multiapp_nearest_node_transfer/fromsub_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  elem_type = QUAD8
[]

[Variables]
  [u]
    family = LAGRANGE
    order = FIRST
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
[]

[AuxVariables]
  [nodal_source_from_sub_nodal]
    family = LAGRANGE
    order = FIRST
  []
  [nodal_source_from_sub_elemental]
    family = MONOMIAL
    order = CONSTANT
  []
  [elemental_source_from_sub_nodal]
    family = LAGRANGE
    order = FIRST
  []
  [elemental_source_from_sub_elemental]
    family = MONOMIAL
    order = CONSTANT
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0.48 0.01 0 -1.01 0.01 0'
    input_files = fromsub_sub.i
  []
[]

[Transfers]
  [from_sub_nodal_from_nodal]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u
    variable = nodal_source_from_sub_nodal
  []
  [from_sub_nodal_from_elemental]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u
    variable = nodal_source_from_sub_elemental
  []
  [from_sub_elemental_from_nodal]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u_elemental
    variable = elemental_source_from_sub_nodal
  []
  [from_sub_elemental_from_elemental]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u_elemental
    variable = elemental_source_from_sub_elemental
  []
[]

(test/tests/multiapps/multilevel/dt_from_sub_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0 0.5 0.5 0'
    input_files = dt_from_sub_sub.i
  [../]
[]

(test/tests/transfers/multiapp_mesh_function_transfer/tosub_source_displaced.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  displacements = 'x_disp y_disp'
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./x_disp]
    initial_condition = -0.1
  [../]
  [./y_disp]
    initial_condition = -0.1
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    positions = '.1 .1 0 0.6 0.6 0 0.6 0.1 0'
    type = TransientMultiApp
    app_type = MooseTestApp
    input_files = tosub_sub.i
    execute_on = timestep_end
  [../]
[]

[Transfers]
  [./to_sub]
    source_variable = u
    direction = to_multiapp
    variable = transferred_u
    type = MultiAppMeshFunctionTransfer
    multi_app = sub
    #displaced_source_mesh = true
  [../]

  [./elemental_to_sub]
    source_variable = u
    direction = to_multiapp
    variable = elemental_transferred_u
    type = MultiAppMeshFunctionTransfer
    multi_app = sub
    #displaced_source_mesh = true
  [../]
[]

(modules/functional_expansion_tools/test/tests/errors/multiapp_bad_function_series.i)

[Mesh]
  type = GeneratedMesh
  dim = 1

  xmin = 0.0
  xmax = 10.0
  nx = 15
[]

[Variables]
  [./m]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[AuxVariables]
  [./s_in]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff_m]
    type = Diffusion
    variable = m
  [../]
  [./time_diff_m]
    type = TimeDerivative
    variable = m
  [../]
  [./s_in]
    type = CoupledForce
    variable = m
    v = s_in
  [../]
[]

[AuxKernels]
  [./reconstruct_s_in]
    type = FunctionSeriesToAux
    variable = s_in
    function = FX_Basis_Value_Main
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    variable = m
    value = 1
  [../]
[]

[BCs]
  [./surround]
    type = DirichletBC
    variable = m
    value = 1
    boundary = 'left right'
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '3'
    physical_bounds = '0.0  10.0'
    x = Legendre
  [../]
  [./AnotherFunction]
    type = ConstantFunction
    value = -1
  [../]
[]

[UserObjects]
  [./FX_Value_UserObject_Main]
    type = FXVolumeUserObject
    function = FX_Basis_Value_Main
    variable = m
  [../]
[]

[Postprocessors]
  [./average_value]
    type = ElementAverageValue
    variable = m
  [../]
  [./peak_value]
    type = ElementExtremeValue
    value_type = max
    variable = m
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = multiapp_sub.i
  [../]
[]

[Transfers]
  [./ValueToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = AnotherFunction
    multi_app_object_name = FX_Basis_Value_Sub
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
[]

(test/tests/multiapps/stateful_material_sub_cycling/material_sub_app_test_master.i)

[Problem]
  solve = false
[]

[Mesh] #dummy
  type = GeneratedMesh
  dim = 2
[]

[Executioner]
  type = Transient
  start_time = 0.0
  dt = 1
  end_time = 10.0
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    input_files = material_sub_app_test_sub.i

    # Test that stateful material properties
    # are updated properly with subcycling
    sub_cycling = true
  [../]
[]

[Outputs]
  csv = false
  exodus = false
[]

(tutorials/tutorial02_multiapps/step01_multiapps/01_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [u]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
  [force]
    type = BodyForce
    variable = u
    value = 1.
  []
  [td]
    type = TimeDerivative
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 0
  []
[]

[Executioner]
  type = Transient
  end_time = 2
  dt = 1.

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub_app]
    type = TransientMultiApp
    positions = '0 0 0'
    input_files = '01_sub.i'
  []
[]

(test/tests/multiapps/picard_multilevel/picard_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./v]
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./coupled_force]
    type = CoupledForce
    variable = u
    v = v
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Postprocessors]
  [picard_its]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 5
  dt = 1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub1]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = picard_sub.i
    execute_on = 'timestep_end'
  [../]
[]

[Transfers]
  [./v]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub1
    source_variable = v
    variable = v
  [../]
[]

(test/tests/multiapps/catch_up/master.i)

# ##########################################################
# This is a test of the Multiapp System. This test solves
# four independent applications spaced throughout a
# master domain interleaved with a master solve.
#
# @Requirement F7.10
# ##########################################################
[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = 'left'
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = 'right'
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 3
  dt = 0.2
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub_app]
    type = TransientMultiApp
    positions = '0 0 0  0.5 0.5 0'
    input_files = 'sub.i failing_sub.i'
    app_type = MooseTestApp
    execute_on = 'timestep_end'
    max_catch_up_steps = 100
    max_failures = 100
    catch_up = true
  [../]
[]

(test/tests/transfers/multiapp_nearest_node_transfer/two_way_many_apps_master.i)

# In this test, the Master App is a 10x10 grid on the unit square, and
# there are 5 Sub Apps which correspond to each vertex of the unit square
# and the center, arranged in the following order:
# 3   4
#   2
# 0   1
# Sub Apps 0, 1, 3, and 4 currently overlap with a single element in
# each corner of the Master App, while Sub App 2 overlaps with 4
# Master App elements in the center. Note that we move the corner Sub
# Apps "outward" slightly along the diagonals to avoid ambiguity with
# which SubApp is "nearest" to a given Master App element centroid.
# This makes it easier to visually verify that the Transfers are
# working correctly.
[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./from_sub]
  [../]
  [./elemental_from_sub]
    order = CONSTANT
    family = MONOMIAL
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    # Note, in case you want to modify this test.  It is important that there are
    # an odd number of apps because this way we will catch errors caused by load
    # imbalances with our -p 2 tests.
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '-0.11 -0.11 0.0
                 0.91 -0.11 0.0
                 0.4 0.4 0.0
                 -0.11 0.91 0.0
                 0.91 0.91 0.0'
    input_files = two_way_many_apps_sub.i
    execute_on = timestep_end
  [../]
[]

[Transfers]
  [./from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u
    variable = from_sub
  [../]
  [./elemental_from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u
    variable = elemental_from_sub
  [../]
  [./to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = from_master
  [../]
  [./elemental_to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = elemental_from_master
  [../]
[]

(test/tests/transfers/multiapp_projection_transfer/fixed_meshes_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 5
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./from_sub]
  [../]
  [./elemental_from_sub]
    order = CONSTANT
    family = MONOMIAL
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 1
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 0
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 2
  dt = 0.01
  solve_type = NEWTON
[]

[Outputs]
  exodus = true
  #
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0.0 0.0 0'
    input_files = fixed_meshes_sub.i
  [../]
[]

[Transfers]
  [./from_sub]
    type = MultiAppProjectionTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u
    variable = from_sub
    fixed_meshes = true
  [../]
  [./elemental_from_sub]
    type = MultiAppProjectionTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u
    variable = elemental_from_sub
    fixed_meshes = true
  [../]
  [./to_sub]
    type = MultiAppProjectionTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = from_master
    fixed_meshes = true
  [../]
  [./elemental_to_sub]
    type = MultiAppProjectionTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = elemental_from_master
    fixed_meshes = true
  [../]
[]

(modules/functional_expansion_tools/examples/3D_volumetric_Cartesian_direct/main.i)

# Derived from the example '3D_volumetric_Cartesian' with the following differences:
#
#   1) The coupling is performed via BodyForce instead of the
#      FunctionSeriesToAux+CoupledForce approach
[Mesh]
  type = GeneratedMesh
  dim = 3

  xmin = 0.0
  xmax = 10.0
  nx = 15

  ymin = 1.0
  ymax = 11.0
  ny = 25

  zmin = 2.0
  zmax = 12.0
  nz = 35
[]

[Variables]
  [./m]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff_m]
    type = HeatConduction
    variable = m
  [../]
  [./time_diff_m]
    type = HeatConductionTimeDerivative
    variable = m
  [../]
  [./s_in] # Add in the contribution from the SubApp
    type = BodyForce
    variable = m
    function = FX_Basis_Value_Main
  [../]
[]

[Materials]
  [./Unobtanium]
    type = GenericConstantMaterial
    prop_names =  'thermal_conductivity specific_heat density'
    prop_values = '1.0                  1.0           1.0' # W/(cm K), J/(g K), g/cm^3
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    variable = m
    value = 1
  [../]
[]

[BCs]
  [./surround]
    type = DirichletBC
    variable = m
    value = 1
    boundary = 'top bottom left right front back'
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '3   4   5'
    physical_bounds = '0.0  10.0    1.0 11.0    2.0 12.0'
    x = Legendre
    y = Legendre
    z = Legendre
    enable_cache = true
  [../]
[]

[UserObjects]
  [./FX_Value_UserObject_Main]
    type = FXVolumeUserObject
    function = FX_Basis_Value_Main
    variable = m
  [../]
[]

[Postprocessors]
  [./average_value]
    type = ElementAverageValue
    variable = m
  [../]
  [./peak_value]
    type = ElementExtremeValue
    value_type = max
    variable = m
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = sub.i
  [../]
[]

[Transfers]
  [./ValueToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Value_UserObject_Main
    multi_app_object_name = FX_Basis_Value_Sub
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
[]

(test/tests/multiapps/sub_cycling/master_sub_output.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 4
  dt = 0.1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '0 0 0'
    input_files = sub.i
    sub_cycling = true
    output_sub_cycles = true
  [../]
[]

(test/tests/transfers/multiapp_variable_value_sample_transfer/master_quad.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./master_aux]
    order = CONSTANT
    family = MONOMIAL
  [../]
[]

[Functions]
  [./func]
    type = ParsedFunction
    value = x*y*t
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
[]

[AuxKernels]
  [./func_aux]
    type = FunctionAux
    variable = master_aux
    function = func
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 5
  dt = 0.1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  nl_rel_tol = 1e-12
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./quad]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0.05 0.05 0 0.95 0.05 0 0.05 0.95 0 0.95 0.95 0'
    input_files = quad_sub.i
  [../]
[]

[Transfers]
  [./master_to_sub]
    type = MultiAppVariableValueSamplePostprocessorTransfer
    direction = to_multiapp
    multi_app = quad
    source_variable = master_aux
    postprocessor = pp
  [../]
[]

(test/tests/transfers/reporter_transfer/clone.i)

[Mesh/generate]
  type = GeneratedMeshGenerator
  dim = 1
[]

[Problem]
  kernel_coverage_check = false
  solve = false
[]

[Reporters]
  [receiver]
    type = ConstantReporter
  []
[]

[MultiApps]
  [multi_vector]
    type = TransientMultiApp
    input_files = 'sub0.i sub0.i sub1.i sub1.i'
    positions = '0 0 0
                 0 0 0
                 0 0 0
                 0 0 0'
    cli_args = 'Outputs/active="" Outputs/active="" Outputs/active="" Outputs/active=""'
  []
  [multi_reporter]
    type = TransientMultiApp
    input_files = 'sub0.i sub0.i sub0.i sub0.i'
    positions = '0 0 0
                 0 0 0
                 0 0 0
                 0 0 0'
    cli_args = 'Postprocessors/from_sub_pp/default=3.1415926;Reporters/from_sub_rep/integer_values=10;Reporters/from_sub_rep/string_values=ten;Outputs/active=""
                Postprocessors/from_sub_pp/default=1.5707963;Reporters/from_sub_rep/integer_values=11;Reporters/from_sub_rep/string_values=twenty;Outputs/active=""
                Postprocessors/from_sub_pp/default=1.0471975;Reporters/from_sub_rep/integer_values=12;Reporters/from_sub_rep/string_values=thirty;Outputs/active=""
                Postprocessors/from_sub_pp/default=0.7853981;Reporters/from_sub_rep/integer_values=13;Reporters/from_sub_rep/string_values=forty;Outputs/active=""'
  []
  [single_app]
    type = TransientMultiApp
    input_files = 'sub0.i'
    cli_args = 'Outputs/active=""'
  []
[]

[Transfers]
  [multi_vpp]
    type = MultiAppCloneReporterTransfer
    from_reporters = 'from_sub_vpp/a from_sub_vpp/b'
    to_reporter = receiver
    multi_app = multi_vector
  []
  [multi_rep]
    type = MultiAppCloneReporterTransfer
    from_reporters = 'from_sub_pp/value from_sub_rep/int from_sub_rep/str'
    to_reporter = receiver
    multi_app = multi_reporter
  []
  [single]
    type = MultiAppCloneReporterTransfer
    from_reporters = 'from_sub_pp/value from_sub_rep/int from_sub_rep/str'
    to_reporter = receiver
    multi_app = single_app
  []
[]

[Executioner]
  type = Transient
  num_steps = 1
[]

[Outputs]
  [out]
    type = JSON
    execute_system_information_on = NONE
    vectorpostprocessors_as_reporters = true
  []
  execute_on = timestep_end
[]

(test/tests/outputs/output_if_base_contains/dt_from_master_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 0.25

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0 0.5 0.5 0'
    input_files = dt_from_master_sub.i
  [../]
[]

(test/tests/transfers/multiapp_postprocessor_transfer/master_from_multiapp.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./from_sub]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Postprocessors]
  [./sub_average]
    type = Receiver
  [../]
  [./sub_sum]
    type = Receiver
  [../]
  [./sub_maximum]
    type = Receiver
  [../]
  [./sub_minimum]
    type = Receiver
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    positions = '0.2 0.2 0 0.7 0.7 0'
    type = TransientMultiApp
    app_type = MooseTestApp
    input_files = 'sub0.i sub1.i'
  [../]
[]

[Transfers]
  [./pp_transfer_ave]
    type = MultiAppPostprocessorTransfer
    reduction_type = average
    direction = from_multiapp
    multi_app = sub
    from_postprocessor = average
    to_postprocessor = sub_average
  [../]
  [./pp_transfer_sum]
    type = MultiAppPostprocessorTransfer
    reduction_type = sum
    direction = from_multiapp
    multi_app = sub
    from_postprocessor = average
    to_postprocessor = sub_sum
  [../]
  [./pp_transfer_min]
    type = MultiAppPostprocessorTransfer
    reduction_type = minimum
    direction = from_multiapp
    multi_app = sub
    from_postprocessor = average
    to_postprocessor = sub_minimum
  [../]
  [./pp_transfer_max]
    type = MultiAppPostprocessorTransfer
    reduction_type = maximum
    direction = from_multiapp
    multi_app = sub
    from_postprocessor = average
    to_postprocessor = sub_maximum
  [../]
[]

(test/tests/multiapps/reset/multilevel_sub.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.01

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '1 1 0'
    input_files = multilevel_sub_sub.i
    output_in_position = true
  [../]
[]

(test/tests/transfers/multiapp_mesh_function_transfer/fromsub_source_displaced.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./transferred_u]
  [../]
  [./elemental_transferred_u]
    order = CONSTANT
    family = MONOMIAL
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    positions = '.099 .099 0 .599 .599 0 0.599 0.099 0'
    type = TransientMultiApp
    app_type = MooseTestApp
    input_files = fromsub_sub.i
  [../]
[]

[Transfers]
  [./from_sub]
    source_variable = sub_u
    direction = from_multiapp
    variable = transferred_u
    type = MultiAppMeshFunctionTransfer
    multi_app = sub
    displaced_source_mesh = true
  [../]
  [./elemental_from_sub]
    source_variable = sub_u
    direction = from_multiapp
    variable = elemental_transferred_u
    type = MultiAppMeshFunctionTransfer
    multi_app = sub
    displaced_source_mesh = true
  [../]
[]

(test/tests/transfers/multiapp_postprocessor_interpolation_transfer/multilevel_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./sub_average]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0 0.5 0.5 0'
    input_files = multilevel_sub.i
  [../]
[]

[Transfers]
  [./sub_average]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = from_multiapp
    multi_app = sub
    variable = sub_average
    postprocessor = sub_average
  [../]
[]

(test/tests/transfers/multiapp_userobject_transfer/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 3
  nx = 20
  ny = 20
  nz = 20
  # The MultiAppUserObjectTransfer object only works with ReplicatedMesh
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./multi_layered_average]
  [../]
  [./element_multi_layered_average]
    order = CONSTANT
    family = MONOMIAL
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 0.001 # This will be constrained by the multiapp

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  l_tol = 1e-8
  nl_rel_tol = 1e-10
[]


[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub_app]
    positions = '0.3 0.1 0.3 0.7 0.1 0.3'
    type = TransientMultiApp
    input_files = sub.i
    app_type = MooseTestApp
  [../]
[]

[Transfers]
  [./layered_transfer]
    direction = from_multiapp
    user_object = layered_average
    variable = multi_layered_average
    type = MultiAppUserObjectTransfer
    multi_app = sub_app
  [../]
  [./element_layered_transfer]
    direction = from_multiapp
    user_object = layered_average
    variable = element_multi_layered_average
    type = MultiAppUserObjectTransfer
    multi_app = sub_app
  [../]
[]

(modules/porous_flow/examples/multiapp_fracture_flow/diffusion_multiapp/fracture_app.i)

# Temperature is transferred between the fracture and matrix apps
[Mesh]
  [generate]
    type = GeneratedMeshGenerator
    dim = 1
    nx = 100
    xmin = 0
    xmax = 50.0
  []
[]

[Variables]
  [frac_T]
  []
[]

[ICs]
  [frac_T]
    type = FunctionIC
    variable = frac_T
    function = 'if(x<1E-6, 2, 0)'  # delta function
  []
[]

[AuxVariables]
  [transferred_matrix_T]
  []
[]

[Kernels]
  [dot]
    type = TimeDerivative
    variable = frac_T
  []
  [fracture_diffusion]
    type = Diffusion
    variable = frac_T
  []
  [toMatrix]
    type = PorousFlowHeatMassTransfer
    variable = frac_T
    v = transferred_matrix_T
    transfer_coefficient = 0.004
  []
[]

[Preconditioning]
  [entire_jacobian]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  solve_type = NEWTON
  dt = 100
  end_time = 100
[]

[VectorPostprocessors]
  [final_results]
    type = LineValueSampler
    start_point = '0 0 0'
    end_point = '50 0 0'
    num_points = 11
    sort_by = x
    variable = frac_T
    outputs = final_csv
  []
[]

[Outputs]
  print_linear_residuals = false
  [final_csv]
    type = CSV
    sync_times = 100
    sync_only = true
  []
[]

[MultiApps]
  [matrix_app]
    type = TransientMultiApp
    input_files = matrix_app.i
    execute_on = TIMESTEP_END
  []
[]

[Transfers]
  [T_to_matrix]
    type = MultiAppCopyTransfer
    direction = to_multiapp
    multi_app = matrix_app
    source_variable = frac_T
    variable = transferred_frac_T
  []
  [T_from_matrix]
    type = MultiAppCopyTransfer
    direction = from_multiapp
    multi_app = matrix_app
    source_variable = matrix_T
    variable = transferred_matrix_T
  []
[]

(modules/misc/test/tests/dynamic_loading/dynamic_load_multiapp/misc_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 2
  dt = 0.2

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub_app]
    positions = '0.5 0.5 0'
    type = TransientMultiApp
    input_files = 'phase_field_sub.i'

    # Here we'll attempt to load a different module that's not compiled into this module
    app_type = PhaseFieldApp

    # Here we set an input file specific relative library path instead of using MOOSE_LIBRARY_PATH
    library_path = '../../../../../phase_field/lib'
  [../]
[]

(modules/misc/test/tests/dynamic_loading/dynamic_load_multiapp/misc_master_bad.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.2

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub_app]
    positions = '0 0 0  0.5 0.5 0  0.6 0.6 0  0.7 0.7 0'
    type = TransientMultiApp
    input_files = 'phase_field_sub.i'

    # Here we'll attempt to load a different module that's not compiled into this module
    app_type = InvalidApp

    # Here we set an input file specific relative library path instead of using MOOSE_LIBRARY_PATH
    library_path = '../../../../../phase_field/lib'
  [../]
[]

(modules/external_petsc_solver/test/tests/partition/moose_as_master.i)

[Mesh]
  [gmg]
    type = DistributedRectilinearMeshGenerator
    dim = 2
    nx = 20
    ny = 21
    partition = square
  []
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./v]
  [../]
  [pid]
    family = MONOMIAL
    order = CONSTANT
  []
[]

[AuxKernels]
  [pid_aux]
    type = ProcessorIDAux
    variable = pid
    execute_on = 'INITIAL'
  []
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
  [./cf]
    type = CoupledForce
    coef = 10000
    variable = u
    v=v
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.2

  solve_type = 'PJFNK'

  fixed_point_max_its = 10
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
  nl_rel_tol = 1e-6
  nl_abs_tol = 1e-12

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[Postprocessors]
  [./picard_its]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  [../]
[]

[MultiApps]
  [./sub_app]
    type = TransientMultiApp
    input_files = 'petsc_transient_as_sub.i'
    app_type = ExternalPetscSolverApp
    library_path = '../../../../external_petsc_solver/lib'
  [../]
[]

[Transfers]
  [./fromsub]
    type = MultiAppMeshFunctionTransfer
    direction = from_multiapp
    multi_app = sub_app
    source_variable = u
    variable = v
  [../]
[]

(test/tests/transfers/multiapp_mesh_function_transfer/fromsub.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [u]
  []
[]

[AuxVariables]
  [transferred_u]
  []
  [elemental_transferred_u]
    order = CONSTANT
    family = MONOMIAL
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub]
    positions = '.099 .099 0 .599 .599 0 0.599 0.099 0'
    type = TransientMultiApp
    app_type = MooseTestApp
    input_files = fromsub_sub.i
  []
[]

[Transfers]
  [from_sub]
    source_variable = 'sub_u sub_u'
    direction = from_multiapp
    variable = 'transferred_u elemental_transferred_u'
    type = MultiAppMeshFunctionTransfer
    multi_app = sub
  []
[]

(test/tests/multiapps/relaxation/bad_relax_factor_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./v]
    initial_condition = 1
  [../]
  [./inverse_v]
    initial_condition = 1
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
  [./force_u]
    type = CoupledForce
    variable = u
    v = inverse_v
  [../]
[]

[AuxKernels]
  [./invert_v]
    type = QuotientAux
    variable = inverse_v
    denominator = v
    numerator = 20.0
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./Neumann_right]
    type = NeumannBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Postprocessors]
  [picard_its]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 4
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_abs_tol = 1e-14
  relaxation_factor = 2.0
  transformed_variables = u
[]

[Outputs]
  exodus = true
  execute_on = 'INITIAL TIMESTEP_END'
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_begin
    positions = '0 0 0'
    input_files = picard_relaxed_sub.i
  [../]
[]

[Transfers]
  [./v_from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = v
    variable = v
  [../]
  [./u_to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = u
  [../]
[]

(test/tests/multiapps/sub_cycling/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 4
  dt = 0.1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '0 0 0'
    input_files = sub.i
    sub_cycling = true
  [../]
[]

(tutorials/tutorial02_multiapps/step03_coupling/03_master_subcycling_picard.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [u]
  []
[]

[AuxVariables]
  [vt]
  []
[]

[Kernels]
  [diff]
    type = MatDiffusion
    variable = u
  []
  [force]
    type = BodyForce
    variable = u
    value = 1.
  []
  [td]
    type = TimeDerivative
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Materials]
  [diff]
    type = ParsedMaterial
    f_name = D
    args = 'vt'
    function = 'vt'
  []
[]

[Executioner]
  type = Transient
  end_time = 2
  dt = 0.2

  picard_max_its = 10

  nl_abs_tol = 1e-10
  picard_rel_tol = 1e-6
  picard_abs_tol = 1e-10

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [micro]
    type = TransientMultiApp
    positions = '0.15 0.15 0  0.45 0.45 0  0.75 0.75 0'
    input_files = '03_sub_subcycling_picard.i'
    execute_on = timestep_end
    output_in_position = true
    sub_cycling = true
  []
[]

[Transfers]
  [push_u]
    type = MultiAppVariableValueSampleTransfer
    multi_app = micro
    direction = to_multiapp
    source_variable = u
    variable = ut
  []

  [pull_v]
    type = MultiAppPostprocessorInterpolationTransfer
    multi_app = micro
    direction = from_multiapp
    variable = vt
    postprocessor = average_v
  []
[]

(modules/combined/examples/geochem-porous_flow/geotes_2D/exchanger.i)

# Model of the heat-exchanger
# The input fluid to the heat exchanger is determined by AuxVariables called production_temperature, production_rate_Na, production_rate_Cl, production_rate_SiO2 and production_rate_H2O.  These come from Postprocessors in the porous-flow simulation that measure the fluid composition at the production well.
# Given the input fluid, the exchanger cools/heats the fluid, removing any precipitates, and injects fluid back to the porous-flow simulation at temperature output_temperature and composition given by massfrac_Na, etc.
# In the absence of data concerning Quartz precipitation rates in heat exchangers, do not treat Quartz as kinetic
[GlobalParams]
  point = '0 0 0'
  reactor = reactor
[]

[TimeDependentReactionSolver]
  model_definition = definition
  include_moose_solve = false
  geochemistry_reactor_name = reactor
  charge_balance_species = "Cl-"
  swap_out_of_basis = "SiO2(aq)"
  swap_into_basis = "QuartzLike"
  constraint_species = "H2O              Na+              Cl-              QuartzLike"
  constraint_value = "  1.0E-2           0.1E-2           0.1E-2           1E-10"
  constraint_meaning = "kg_solvent_water bulk_composition bulk_composition free_mineral"
  constraint_unit = "   kg               moles            moles            moles"
  initial_temperature = 50.0
  mode = 4
  temperature = 200
  cold_temperature = 40.0
  source_species_names = 'H2O    Na+   Cl-   SiO2(aq)'
  source_species_rates = 'production_rate_H2O production_rate_Na production_rate_Cl production_rate_SiO2'
  ramp_max_ionic_strength_initial = 0 # max_ionic_strength in such a simple problem does not need ramping
  add_aux_pH = false # there is no H+ in this system
  evaluate_kinetic_rates_always = true # implicit time-marching used for stability
  execute_console_output_on = '' # only CSV output used in this example
[]

[UserObjects]
  [definition]
    type = GeochemicalModelDefinition
    database_file = "small_database.json"
    basis_species = "H2O SiO2(aq) Na+ Cl-"
    equilibrium_minerals = "QuartzLike"
  []
[]

[Executioner]
  type = Transient
  dt = 1E5
  end_time = 2E6 #7.76E6 # 90 days
[]

[AuxVariables]
  [production_temperature]
    initial_condition = 50 # the production_T Transfer lags one timestep behind for some reason, so give this a reasonable initial condition
  []
  [transported_H2O]
  []
  [transported_Na]
  []
  [transported_Cl]
  []
  [transported_SiO2]
  []
  [transported_mass]
  []
  [massfrac_H2O]
  []
  [massfrac_Na]
  []
  [massfrac_Cl]
  []
  [massfrac_SiO2]
  []
  [dumped_quartz]
  []
  [production_rate_H2O]
    initial_condition = 5.518533e+01 # the production_H2O Transfer lags one timestep behind for some reason (when the porous_flow simulation has finished, it correctly computes mole_rate_H2O_produced, but the Transfer gets the mole_rate_H2O_produced from the previous timestep), so give this a reasonable initial condition, otherwise this will be zero at the start of the simulation!
  []
  [production_rate_Na]
    initial_condition = 9.943302e-02
  []
  [production_rate_Cl]
    initial_condition = 9.943302e-02
  []
  [production_rate_SiO2]
    initial_condition = 2.340931e-04
  []
[]
[AuxKernels]
  [transported_H2O_auxk]
    type = GeochemistryQuantityAux
    variable = transported_H2O
    species = H2O
    quantity = transported_moles_in_original_basis
  []
  [transported_Na]
    type = GeochemistryQuantityAux
    variable = transported_Na
    species = Na+
    quantity = transported_moles_in_original_basis
  []
  [transported_Cl]
    type = GeochemistryQuantityAux
    variable = transported_Cl
    species = Cl-
    quantity = transported_moles_in_original_basis
  []
  [transported_SiO2]
    type = GeochemistryQuantityAux
    variable = transported_SiO2
    species = 'SiO2(aq)'
    quantity = transported_moles_in_original_basis
  []
  [transported_mass_auxk]
    type = ParsedAux
    args = 'transported_H2O transported_Na transported_Cl transported_SiO2'
    variable = transported_mass
    function = 'transported_H2O * 18.0152 + transported_Na * 22.9898 + transported_Cl * 35.453 + transported_SiO2 * 60.0843'
  []
  [massfrac_H2O]
    type = ParsedAux
    args = 'transported_mass transported_H2O'
    variable = massfrac_H2O
    function = '18.0152 * transported_H2O / transported_mass'
  []
  [massfrac_Na]
    type = ParsedAux
    args = 'transported_mass transported_Na'
    variable = massfrac_Na
    function = '22.9898 * transported_Na / transported_mass'
  []
  [massfrac_Cl]
    type = ParsedAux
    args = 'transported_mass transported_Cl'
    variable = massfrac_Cl
    function = '35.453 * transported_Cl / transported_mass'
  []
  [massfrac_SiO2]
    type = ParsedAux
    args = 'transported_mass transported_SiO2'
    variable = massfrac_SiO2
    function = '60.0843 * transported_SiO2 / transported_mass'
  []
  [dumped_quartz]
    type = GeochemistryQuantityAux
    variable = dumped_quartz
    species = QuartzLike
    quantity = moles_dumped
  []
[]
[Postprocessors]
  [cumulative_moles_precipitated_quartz]
    type = PointValue
    variable = dumped_quartz
  []
  [production_temperature]
    type = PointValue
    variable = production_temperature
  []
  [mass_heated_this_timestep]
    type = PointValue
    variable = transported_mass
  []
[]
[Outputs]
  csv = true
[]

[MultiApps]
  [porous_flow_sim]
    type = TransientMultiApp
    input_files = porous_flow.i
    execute_on = 'timestep_end'
  []
[]

[Transfers]
  [injection_T]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'solution_temperature'
    variable = 'injection_temperature'
  []
  [injection_Na]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_Na'
    variable = 'injection_rate_massfrac_Na'
  []
  [injection_Cl]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_Cl'
    variable = 'injection_rate_massfrac_Cl'
  []
  [injection_SiO2]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_SiO2'
    variable = 'injection_rate_massfrac_SiO2'
  []
  [injection_H2O]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_H2O'
    variable = 'injection_rate_massfrac_H2O'
  []

  [production_T]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = production_temperature
    variable = production_temperature
  []
  [production_Na]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_Na_produced
    variable = production_rate_Na
  []
  [production_Cl]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_Cl_produced
    variable = production_rate_Cl
  []
  [production_SiO2]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_SiO2_produced
    variable = production_rate_SiO2
  []
  [production_H2O]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_H2O_produced
    variable = production_rate_H2O
  []
[]

(modules/stochastic_tools/test/tests/transfers/sampler_transfer/errors/master_multiapp_type_error.i)

[StochasticTools]
  auto_create_executioner = false
[]

[Distributions]
  [uniform]
    type = Uniform
    lower_bound = 1
    upper_bound = 2
  []
[]

[Samplers]
  [sample]
    type = MonteCarlo
    num_rows = 3
    distributions = 'uniform'
    execute_on = INITIAL # create random numbers on initial and use them for each timestep
  []
[]

[MultiApps]
  [sub]
    type = TransientMultiApp
    input_files = sub.i
    positions = '0 0 0'
  []
[]

[Transfers]
  [sub]
    type = SamplerParameterTransfer
    multi_app = sub
    sampler = sample
    parameters = 'BCs/left/value BCs/right/value'
    to_control = 'stochasticsub'
  []
[]

[Executioner]
  type = Transient
  num_steps = 5
  dt = 0.01
[]

[Outputs]
  execute_on = 'INITIAL TIMESTEP_END'
[]

(modules/combined/examples/geochem-porous_flow/geotes_weber_tensleep/exchanger.i)

#########################################
#                                       #
# File written by create_input_files.py #
#                                       #
#########################################
# Model of the heat-exchanger
# The input fluid to the heat exchanger is determined by AuxVariables called production_temperature, production_rate_H, production_rate_Cl, production_rate_SO4, production_rate_HCO3, production_rate_SiO2aq, production_rate_Al, production_rate_Ca, production_rate_Mg, production_rate_Fe, production_rate_K, production_rate_Na, production_rate_Sr, production_rate_F, production_rate_BOH, production_rate_Br, production_rate_Ba, production_rate_Li, production_rate_NO3, production_rate_O2aq, production_rate_H2O.  These come from Postprocessors in the porous_flow.i simulation that measure the fluid composition at the production well.
# Given the input fluid, the exchanger cools/heats the fluid, removing any precipitates, and injects fluid back to porous_flow.i at temperature output_temperature and composition given by massfrac_H, etc.

[UserObjects]
  [definition]
    type = GeochemicalModelDefinition
    database_file = '../../../../geochemistry/database/moose_geochemdb.json'
    basis_species = 'H2O H+ Cl- SO4-- HCO3- SiO2(aq) Al+++ Ca++ Mg++ Fe++ K+ Na+ Sr++ F- B(OH)3 Br- Ba++ Li+ NO3- O2(aq)'
    equilibrium_minerals = 'Siderite Pyrrhotite Dolomite Illite Anhydrite Calcite Quartz K-feldspar Kaolinite Barite Celestite Fluorite Albite Chalcedony Goethite'
  []
[]

[TimeDependentReactionSolver]
  model_definition = definition
  include_moose_solve = false
  geochemistry_reactor_name = reactor
  swap_out_of_basis = 'NO3- O2(aq)'
  swap_into_basis = '  NH3  HS-'
  charge_balance_species = 'Cl-'
# initial conditions are unimportant because in exchanger mode all existing fluid is flushed from the system before adding the produced water
  constraint_species = 'H2O H+ Cl- SO4-- HCO3- SiO2(aq) Al+++ Ca++ Mg++ Fe++ K+ Na+ Sr++ F- B(OH)3 Br- Ba++ Li+ NH3 HS-'
  constraint_value = '1.0 1E-6 1E-6 1E-18 1E-18 1E-18    1E-18 1E-18 1E-18 1E-18 1E-18 1E-18 1E-18 1E-18 1E-18 1E-18 1E-18 1E-18 1E-18 1E-18'
  constraint_meaning = 'kg_solvent_water bulk_composition bulk_composition free_concentration free_concentration free_concentration free_concentration free_concentration free_concentration free_concentration free_concentration free_concentration free_concentration free_concentration free_concentration free_concentration free_concentration free_concentration free_concentration free_concentration'
  constraint_unit = "kg moles moles molal molal molal molal molal molal molal molal molal molal molal molal molal molal molal molal molal"
  prevent_precipitation = 'Fluorite Albite Goethite'
  initial_temperature = 92
  mode = 4
  temperature = ramp_temperature # ramp up to 160degC over ~1 day so that aquifer geochemistry simulation can easily converge
  cold_temperature = 92
  heating_increments = 10
  source_species_names = ' H+ Cl- SO4-- HCO3- SiO2(aq) Al+++ Ca++ Mg++ Fe++ K+ Na+ Sr++ F- B(OH)3 Br- Ba++ Li+ NO3- O2(aq) H2O'
  source_species_rates = ' production_rate_H production_rate_Cl production_rate_SO4 production_rate_HCO3 production_rate_SiO2aq production_rate_Al production_rate_Ca production_rate_Mg production_rate_Fe production_rate_K production_rate_Na production_rate_Sr production_rate_F production_rate_BOH production_rate_Br production_rate_Ba production_rate_Li production_rate_NO3 production_rate_O2aq production_rate_H2O'
  ramp_max_ionic_strength_initial = 0 # max_ionic_strength in such a simple problem does not need ramping
[]

[GlobalParams]
  point = '0 0 0'
  reactor = reactor
[]

[AuxVariables]
  [ramp_temperature]
    initial_condition = 92
  []
  [production_temperature]
    initial_condition = 92 # the production_T Transfer lags one timestep behind for some reason, so give this a reasonable initial condition
  []
  [transported_H]
  []
  [transported_Cl]
  []
  [transported_SO4]
  []
  [transported_HCO3]
  []
  [transported_SiO2aq]
  []
  [transported_Al]
  []
  [transported_Ca]
  []
  [transported_Mg]
  []
  [transported_Fe]
  []
  [transported_K]
  []
  [transported_Na]
  []
  [transported_Sr]
  []
  [transported_F]
  []
  [transported_BOH]
  []
  [transported_Br]
  []
  [transported_Ba]
  []
  [transported_Li]
  []
  [transported_NO3]
  []
  [transported_O2aq]
  []
  [transported_H2O]
  []
  [transported_mass]
  []
  [massfrac_H]
  []
  [massfrac_Cl]
  []
  [massfrac_SO4]
  []
  [massfrac_HCO3]
  []
  [massfrac_SiO2aq]
  []
  [massfrac_Al]
  []
  [massfrac_Ca]
  []
  [massfrac_Mg]
  []
  [massfrac_Fe]
  []
  [massfrac_K]
  []
  [massfrac_Na]
  []
  [massfrac_Sr]
  []
  [massfrac_F]
  []
  [massfrac_BOH]
  []
  [massfrac_Br]
  []
  [massfrac_Ba]
  []
  [massfrac_Li]
  []
  [massfrac_NO3]
  []
  [massfrac_O2aq]
  []
  [massfrac_H2O]
  []
  [dumped_Siderite]
  []
  [dumped_Pyrrhotite]
  []
  [dumped_Dolomite]
  []
  [dumped_Illite]
  []
  [dumped_Anhydrite]
  []
  [dumped_Calcite]
  []
  [dumped_Quartz]
  []
  [dumped_K-feldspar]
  []
  [dumped_Kaolinite]
  []
  [dumped_Barite]
  []
  [dumped_Celestite]
  []
  [dumped_Fluorite]
  []
  [dumped_Albite]
  []
  [dumped_Chalcedony]
  []
  [dumped_Goethite]
  []
# The production_* Transfers lag one timestep behind for some reason (when the porous_flow simulation has finished, it correctly computes mole_rate_*_produced, but the Transfer gets the mole_rate_*_produced from the previous timestep), so give the production_rate_* reasonable initial conditions, otherwise they will be zero at the start of the simulation.
  [production_rate_H]
    initial_condition = -0.00058596786807342
  []
  [production_rate_Cl]
    initial_condition = 0.274767413291287
  []
  [production_rate_SO4]
    initial_condition = 0.012567456786868922
  []
  [production_rate_HCO3]
    initial_condition = 0.0001668295857850308
  []
  [production_rate_SiO2aq]
    initial_condition = 0.00010068057668449495
  []
  [production_rate_Al]
    initial_condition = 2.4224219572143877e-07
  []
  [production_rate_Ca]
    initial_condition = 0.0040997718654983036
  []
  [production_rate_Mg]
    initial_condition = 0.00015261342984691217
  []
  [production_rate_Fe]
    initial_condition = 0.0001550375425863269
  []
  [production_rate_K]
    initial_condition = 0.0003500651859998926
  []
  [production_rate_Na]
    initial_condition = 0.2896767602995328
  []
  [production_rate_Sr]
    initial_condition = 2.915285700108879e-05
  []
  [production_rate_F]
    initial_condition = 5.8582680830041476e-05
  []
  [production_rate_BOH]
    initial_condition = 0.0012157199878760335
  []
  [production_rate_Br]
    initial_condition = 0.00022605948665165203
  []
  [production_rate_Ba]
    initial_condition = 2.2773554030672105e-07
  []
  [production_rate_Li]
    initial_condition = 0.0023920780265869763
  []
  [production_rate_NO3]
    initial_condition = 0.000353470613973057
  []
  [production_rate_O2aq]
    initial_condition = -0.00044255942331181803
  []
  [production_rate_H2O]
    initial_condition = 10.10458252764496
  []
[]

[AuxKernels]
  [ramp_temperature]
    type = FunctionAux
    variable = ramp_temperature
    function = 'min(160, max(92, 92 + (160 - 92) * t / 1E5))'
  []
  [transported_H_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_H
    species = 'H+'
  []
  [transported_Cl_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_Cl
    species = 'Cl-'
  []
  [transported_SO4_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_SO4
    species = 'SO4--'
  []
  [transported_HCO3_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_HCO3
    species = 'HCO3-'
  []
  [transported_SiO2aq_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_SiO2aq
    species = 'SiO2(aq)'
  []
  [transported_Al_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_Al
    species = 'Al+++'
  []
  [transported_Ca_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_Ca
    species = 'Ca++'
  []
  [transported_Mg_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_Mg
    species = 'Mg++'
  []
  [transported_Fe_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_Fe
    species = 'Fe++'
  []
  [transported_K_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_K
    species = 'K+'
  []
  [transported_Na_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_Na
    species = 'Na+'
  []
  [transported_Sr_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_Sr
    species = 'Sr++'
  []
  [transported_F_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_F
    species = 'F-'
  []
  [transported_BOH_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_BOH
    species = 'B(OH)3'
  []
  [transported_Br_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_Br
    species = 'Br-'
  []
  [transported_Ba_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_Ba
    species = 'Ba++'
  []
  [transported_Li_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_Li
    species = 'Li+'
  []
  [transported_NO3_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_NO3
    species = 'NO3-'
  []
  [transported_O2aq_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_O2aq
    species = 'O2(aq)'
  []
  [transported_H2O_auxk]
    type = GeochemistryQuantityAux
    quantity = transported_moles_in_original_basis
    variable = transported_H2O
    species = 'H2O'
  []
  [transported_mass_auxk]
    type = ParsedAux
    args = ' transported_H transported_Cl transported_SO4 transported_HCO3 transported_SiO2aq transported_Al transported_Ca transported_Mg transported_Fe transported_K transported_Na transported_Sr transported_F transported_BOH transported_Br transported_Ba transported_Li transported_NO3 transported_O2aq transported_H2O'
    variable = transported_mass
    function = ' transported_H * 1.0079 + transported_Cl * 35.453 + transported_SO4 * 96.0576 + transported_HCO3 * 61.0171 + transported_SiO2aq * 60.0843 + transported_Al * 26.9815 + transported_Ca * 40.08 + transported_Mg * 24.305 + transported_Fe * 55.847 + transported_K * 39.0983 + transported_Na * 22.9898 + transported_Sr * 87.62 + transported_F * 18.9984 + transported_BOH * 61.8329 + transported_Br * 79.904 + transported_Ba * 137.33 + transported_Li * 6.941 + transported_NO3 * 62.0049 + transported_O2aq * 31.9988 + transported_H2O * 18.01801802'
  []
  [massfrac_H_auxk]
    type = ParsedAux
    args = 'transported_mass transported_H'
    variable = massfrac_H
    function = '1.0079 * transported_H / transported_mass'
  []
  [massfrac_Cl_auxk]
    type = ParsedAux
    args = 'transported_mass transported_Cl'
    variable = massfrac_Cl
    function = '35.453 * transported_Cl / transported_mass'
  []
  [massfrac_SO4_auxk]
    type = ParsedAux
    args = 'transported_mass transported_SO4'
    variable = massfrac_SO4
    function = '96.0576 * transported_SO4 / transported_mass'
  []
  [massfrac_HCO3_auxk]
    type = ParsedAux
    args = 'transported_mass transported_HCO3'
    variable = massfrac_HCO3
    function = '61.0171 * transported_HCO3 / transported_mass'
  []
  [massfrac_SiO2aq_auxk]
    type = ParsedAux
    args = 'transported_mass transported_SiO2aq'
    variable = massfrac_SiO2aq
    function = '60.0843 * transported_SiO2aq / transported_mass'
  []
  [massfrac_Al_auxk]
    type = ParsedAux
    args = 'transported_mass transported_Al'
    variable = massfrac_Al
    function = '26.9815 * transported_Al / transported_mass'
  []
  [massfrac_Ca_auxk]
    type = ParsedAux
    args = 'transported_mass transported_Ca'
    variable = massfrac_Ca
    function = '40.08 * transported_Ca / transported_mass'
  []
  [massfrac_Mg_auxk]
    type = ParsedAux
    args = 'transported_mass transported_Mg'
    variable = massfrac_Mg
    function = '24.305 * transported_Mg / transported_mass'
  []
  [massfrac_Fe_auxk]
    type = ParsedAux
    args = 'transported_mass transported_Fe'
    variable = massfrac_Fe
    function = '55.847 * transported_Fe / transported_mass'
  []
  [massfrac_K_auxk]
    type = ParsedAux
    args = 'transported_mass transported_K'
    variable = massfrac_K
    function = '39.0983 * transported_K / transported_mass'
  []
  [massfrac_Na_auxk]
    type = ParsedAux
    args = 'transported_mass transported_Na'
    variable = massfrac_Na
    function = '22.9898 * transported_Na / transported_mass'
  []
  [massfrac_Sr_auxk]
    type = ParsedAux
    args = 'transported_mass transported_Sr'
    variable = massfrac_Sr
    function = '87.62 * transported_Sr / transported_mass'
  []
  [massfrac_F_auxk]
    type = ParsedAux
    args = 'transported_mass transported_F'
    variable = massfrac_F
    function = '18.9984 * transported_F / transported_mass'
  []
  [massfrac_BOH_auxk]
    type = ParsedAux
    args = 'transported_mass transported_BOH'
    variable = massfrac_BOH
    function = '61.8329 * transported_BOH / transported_mass'
  []
  [massfrac_Br_auxk]
    type = ParsedAux
    args = 'transported_mass transported_Br'
    variable = massfrac_Br
    function = '79.904 * transported_Br / transported_mass'
  []
  [massfrac_Ba_auxk]
    type = ParsedAux
    args = 'transported_mass transported_Ba'
    variable = massfrac_Ba
    function = '137.33 * transported_Ba / transported_mass'
  []
  [massfrac_Li_auxk]
    type = ParsedAux
    args = 'transported_mass transported_Li'
    variable = massfrac_Li
    function = '6.941 * transported_Li / transported_mass'
  []
  [massfrac_NO3_auxk]
    type = ParsedAux
    args = 'transported_mass transported_NO3'
    variable = massfrac_NO3
    function = '62.0049 * transported_NO3 / transported_mass'
  []
  [massfrac_O2aq_auxk]
    type = ParsedAux
    args = 'transported_mass transported_O2aq'
    variable = massfrac_O2aq
    function = '31.9988 * transported_O2aq / transported_mass'
  []
  [massfrac_H2O_auxk]
    type = ParsedAux
    args = 'transported_mass transported_H2O'
    variable = massfrac_H2O
    function = '18.01801802 * transported_H2O / transported_mass'
  []
  [dumped_Siderite_auxk]
    type = GeochemistryQuantityAux
    variable = dumped_Siderite
    species = Siderite
    quantity = moles_dumped
  []
  [dumped_Pyrrhotite_auxk]
    type = GeochemistryQuantityAux
    variable = dumped_Pyrrhotite
    species = Pyrrhotite
    quantity = moles_dumped
  []
  [dumped_Dolomite_auxk]
    type = GeochemistryQuantityAux
    variable = dumped_Dolomite
    species = Dolomite
    quantity = moles_dumped
  []
  [dumped_Illite_auxk]
    type = GeochemistryQuantityAux
    variable = dumped_Illite
    species = Illite
    quantity = moles_dumped
  []
  [dumped_Anhydrite_auxk]
    type = GeochemistryQuantityAux
    variable = dumped_Anhydrite
    species = Anhydrite
    quantity = moles_dumped
  []
  [dumped_Calcite_auxk]
    type = GeochemistryQuantityAux
    variable = dumped_Calcite
    species = Calcite
    quantity = moles_dumped
  []
  [dumped_Quartz_auxk]
    type = GeochemistryQuantityAux
    variable = dumped_Quartz
    species = Quartz
    quantity = moles_dumped
  []
  [dumped_K-feldspar_auxk]
    type = GeochemistryQuantityAux
    variable = dumped_K-feldspar
    species = K-feldspar
    quantity = moles_dumped
  []
  [dumped_Kaolinite_auxk]
    type = GeochemistryQuantityAux
    variable = dumped_Kaolinite
    species = Kaolinite
    quantity = moles_dumped
  []
  [dumped_Barite_auxk]
    type = GeochemistryQuantityAux
    variable = dumped_Barite
    species = Barite
    quantity = moles_dumped
  []
  [dumped_Celestite_auxk]
    type = GeochemistryQuantityAux
    variable = dumped_Celestite
    species = Celestite
    quantity = moles_dumped
  []
  [dumped_Fluorite_auxk]
    type = GeochemistryQuantityAux
    variable = dumped_Fluorite
    species = Fluorite
    quantity = moles_dumped
  []
  [dumped_Albite_auxk]
    type = GeochemistryQuantityAux
    variable = dumped_Albite
    species = Albite
    quantity = moles_dumped
  []
  [dumped_Chalcedony_auxk]
    type = GeochemistryQuantityAux
    variable = dumped_Chalcedony
    species = Chalcedony
    quantity = moles_dumped
  []
  [dumped_Goethite_auxk]
    type = GeochemistryQuantityAux
    variable = dumped_Goethite
    species = Goethite
    quantity = moles_dumped
  []
[]

[Postprocessors]
  [cumulative_moles_precipitated_Siderite]
    type = PointValue
    variable = dumped_Siderite
  []
  [cumulative_moles_precipitated_Pyrrhotite]
    type = PointValue
    variable = dumped_Pyrrhotite
  []
  [cumulative_moles_precipitated_Dolomite]
    type = PointValue
    variable = dumped_Dolomite
  []
  [cumulative_moles_precipitated_Illite]
    type = PointValue
    variable = dumped_Illite
  []
  [cumulative_moles_precipitated_Anhydrite]
    type = PointValue
    variable = dumped_Anhydrite
  []
  [cumulative_moles_precipitated_Calcite]
    type = PointValue
    variable = dumped_Calcite
  []
  [cumulative_moles_precipitated_Quartz]
    type = PointValue
    variable = dumped_Quartz
  []
  [cumulative_moles_precipitated_K-feldspar]
    type = PointValue
    variable = dumped_K-feldspar
  []
  [cumulative_moles_precipitated_Kaolinite]
    type = PointValue
    variable = dumped_Kaolinite
  []
  [cumulative_moles_precipitated_Barite]
    type = PointValue
    variable = dumped_Barite
  []
  [cumulative_moles_precipitated_Celestite]
    type = PointValue
    variable = dumped_Celestite
  []
  [cumulative_moles_precipitated_Fluorite]
    type = PointValue
    variable = dumped_Fluorite
  []
  [cumulative_moles_precipitated_Albite]
    type = PointValue
    variable = dumped_Albite
  []
  [cumulative_moles_precipitated_Chalcedony]
    type = PointValue
    variable = dumped_Chalcedony
  []
  [cumulative_moles_precipitated_Goethite]
    type = PointValue
    variable = dumped_Goethite
  []
  [production_temperature]
    type = PointValue
    variable = production_temperature
  []
  [mass_heated_this_timestep]
    type = PointValue
    variable = transported_mass
  []
[]

[Outputs]
  csv = true
[]

[Executioner]
  type = Transient
  solve_type = Newton
  end_time = 7.76E6 # 90 days
  [TimeStepper]
    type = FunctionDT
    function = 'min(3E4, max(1E4, 0.2 * t))'
  []
[]

[MultiApps]
  [porous_flow_sim]
    type = TransientMultiApp
    input_files = porous_flow.i
    execute_on = 'timestep_end'
  []
[]

[Transfers]
  [injection_T]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'solution_temperature'
    variable = 'injection_temperature'
  []
  [injection_H]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_H'
    variable = 'injection_rate_massfrac_H'
  []
  [injection_Cl]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_Cl'
    variable = 'injection_rate_massfrac_Cl'
  []
  [injection_SO4]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_SO4'
    variable = 'injection_rate_massfrac_SO4'
  []
  [injection_HCO3]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_HCO3'
    variable = 'injection_rate_massfrac_HCO3'
  []
  [injection_SiO2aq]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_SiO2aq'
    variable = 'injection_rate_massfrac_SiO2aq'
  []
  [injection_Al]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_Al'
    variable = 'injection_rate_massfrac_Al'
  []
  [injection_Ca]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_Ca'
    variable = 'injection_rate_massfrac_Ca'
  []
  [injection_Mg]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_Mg'
    variable = 'injection_rate_massfrac_Mg'
  []
  [injection_Fe]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_Fe'
    variable = 'injection_rate_massfrac_Fe'
  []
  [injection_K]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_K'
    variable = 'injection_rate_massfrac_K'
  []
  [injection_Na]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_Na'
    variable = 'injection_rate_massfrac_Na'
  []
  [injection_Sr]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_Sr'
    variable = 'injection_rate_massfrac_Sr'
  []
  [injection_F]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_F'
    variable = 'injection_rate_massfrac_F'
  []
  [injection_BOH]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_BOH'
    variable = 'injection_rate_massfrac_BOH'
  []
  [injection_Br]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_Br'
    variable = 'injection_rate_massfrac_Br'
  []
  [injection_Ba]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_Ba'
    variable = 'injection_rate_massfrac_Ba'
  []
  [injection_Li]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_Li'
    variable = 'injection_rate_massfrac_Li'
  []
  [injection_NO3]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_NO3'
    variable = 'injection_rate_massfrac_NO3'
  []
  [injection_O2aq]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_O2aq'
    variable = 'injection_rate_massfrac_O2aq'
  []
  [injection_H2O]
    type = MultiAppNearestNodeTransfer
    direction = TO_MULTIAPP
    multi_app = porous_flow_sim
    fixed_meshes = true
    source_variable = 'massfrac_H2O'
    variable = 'injection_rate_massfrac_H2O'
  []

  [production_T]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = production_temperature
    variable = production_temperature
  []
  [production_H]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_H_produced
    variable = production_rate_H
  []
  [production_Cl]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_Cl_produced
    variable = production_rate_Cl
  []
  [production_SO4]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_SO4_produced
    variable = production_rate_SO4
  []
  [production_HCO3]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_HCO3_produced
    variable = production_rate_HCO3
  []
  [production_SiO2aq]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_SiO2aq_produced
    variable = production_rate_SiO2aq
  []
  [production_Al]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_Al_produced
    variable = production_rate_Al
  []
  [production_Ca]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_Ca_produced
    variable = production_rate_Ca
  []
  [production_Mg]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_Mg_produced
    variable = production_rate_Mg
  []
  [production_Fe]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_Fe_produced
    variable = production_rate_Fe
  []
  [production_K]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_K_produced
    variable = production_rate_K
  []
  [production_Na]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_Na_produced
    variable = production_rate_Na
  []
  [production_Sr]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_Sr_produced
    variable = production_rate_Sr
  []
  [production_F]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_F_produced
    variable = production_rate_F
  []
  [production_BOH]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_BOH_produced
    variable = production_rate_BOH
  []
  [production_Br]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_Br_produced
    variable = production_rate_Br
  []
  [production_Ba]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_Ba_produced
    variable = production_rate_Ba
  []
  [production_Li]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_Li_produced
    variable = production_rate_Li
  []
  [production_NO3]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_NO3_produced
    variable = production_rate_NO3
  []
  [production_O2aq]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_O2aq_produced
    variable = production_rate_O2aq
  []
  [production_H2O]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = FROM_MULTIAPP
    multi_app = porous_flow_sim
    postprocessor = mole_rate_H2O_produced
    variable = production_rate_H2O
  []
[]

(modules/combined/test/tests/beam_eigenstrain_transfer/master_uo_transfer.i)

# Test for multi app vector postprocessor to aux variable transfer

# Master App contains 2 beams, one starting at (1.5, 2.0, 2.0) and
# another starting at (2.5, 0.0, 3.0). Both beams extend for
# 0.150080 m along the y direction.

# Each subApp contains a 2D model of width 0.5 m and height 0.150080 m.
# A time varying temperature profile is assigned to each 2D model and
# the resulting yy strain along the right boundary (x = 0.5) is
# transferred to the beam model using the multi app transfer. The subApps
# are positioned in the [MultiApp] block such that the origin of the beams
# coincides with the origin of the subApp.

# For each master beam node/element, the MultiAppUserObjectTransfer finds
# the subApp where this node belongs, projects this node to the right
# boundary of the subApp and assigns the value corresponding to the
# projected point.

# Result: The y displacement of the beam should equal the y
# displacement along the right boundary of the 2D model.

[Mesh]
  type = FileMesh
  file = 2_beams_new.e
[]

[Variables]
  [./disp_x]
  [../]
  [./disp_y]
  [../]
  [./disp_z]
  [../]
  [./rot_x]
    order = FIRST
    family = LAGRANGE
  [../]
  [./rot_y]
    order = FIRST
    family = LAGRANGE
  [../]
  [./rot_z]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[BCs]
  [./fixx1]
    type = DirichletBC
    variable = disp_x
    boundary = 1
    value = 0.0
  [../]
  [./fixy1]
    type = DirichletBC
    variable = disp_y
    boundary = 1
    value = 0.0
  [../]
  [./fixz1]
    type = DirichletBC
    variable = disp_z
    boundary = 1
    value = 0.0
  [../]
  [./fixr1]
    type = DirichletBC
    variable = rot_x
    boundary = 1
    value = 0.0
  [../]
  [./fixr2]
    type = DirichletBC
    variable = rot_y
    boundary = 1
    value = 0.0
  [../]
  [./fixr3]
    type = DirichletBC
    variable = rot_z
    boundary = 1
    value = 0.0
  [../]
[]

[Kernels]
  [./solid_disp_x]
    type = StressDivergenceBeam
    block = '1'
    displacements = 'disp_x disp_y disp_z'
    rotations = 'rot_x rot_y rot_z'
    component = 0
    variable = disp_x
  [../]
  [./solid_disp_y]
    type = StressDivergenceBeam
    block = '1'
    displacements = 'disp_x disp_y disp_z'
    rotations = 'rot_x rot_y rot_z'
    component = 1
    variable = disp_y
  [../]
  [./solid_disp_z]
    type = StressDivergenceBeam
    block = '1'
    displacements = 'disp_x disp_y disp_z'
    rotations = 'rot_x rot_y rot_z'
    component = 2
    variable = disp_z
  [../]
  [./solid_rot_x]
    type = StressDivergenceBeam
    block = '1'
    displacements = 'disp_x disp_y disp_z'
    rotations = 'rot_x rot_y rot_z'
    component = 3
    variable = rot_x
  [../]
  [./solid_rot_y]
    type = StressDivergenceBeam
    block = '1'
    displacements = 'disp_x disp_y disp_z'
    rotations = 'rot_x rot_y rot_z'
    component = 4
    variable = rot_y
  [../]
  [./solid_rot_z]
    type = StressDivergenceBeam
    block = '1'
    displacements = 'disp_x disp_y disp_z'
    rotations = 'rot_x rot_y rot_z'
    component = 5
    variable = rot_z
  [../]
[]

[Materials]
  [./elasticity]
    type = ComputeElasticityBeam
    youngs_modulus = 1e9
    poissons_ratio = 0.3
    shear_coefficient = 1.0
    block = 1
  [../]
  [./strain]
    type = ComputeIncrementalBeamStrain
    block = '1'
    displacements = 'disp_x disp_y disp_z'
    rotations = 'rot_x rot_y rot_z'
    area = 0.5
    Ay = 0.0
    Az = 0.0
    Iy = 0.01
    Iz = 0.01
    y_orientation = '0.0 0.0 1.0'
    eigenstrain_names = 'thermal'
  [../]
  [./stress]
    type = ComputeBeamResultants
    block = 1
  [../]
  [./thermal]
    type = ComputeEigenstrainBeamFromVariable
    displacement_eigenstrain_variables = 'zero1 to_var zero2'
    eigenstrain_name = thermal
  [../]
[]

[Executioner]
  type = Transient

  #Preconditioned JFNK (default)
  solve_type = 'PJFNK'

  line_search = 'none'

  l_max_its = 50
  nl_max_its = 50
  nl_rel_tol = 1e-12
  nl_abs_tol = 1e-12
  l_tol = 1e-9

  start_time = 0.0
  end_time = 0.075
  dt = 0.0125
  dtmin = 0.0001
[]

[AuxVariables]
  [./to_var]
  [../]
  [./zero1]
  [../]
  [./zero2]
  [../]
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = CombinedApp
    positions = '1.5 2.0 2.0 2.5 0.0 3.0'
    input_files = 'subapp1_uo_transfer.i subapp2_uo_transfer.i'
  [../]
[]

[Transfers]
  [./fromsub]
    type = MultiAppUserObjectTransfer
    direction = from_multiapp
    user_object = axial_str
    multi_app = sub
    variable = to_var
    all_master_nodes_contained_in_sub_app = true
  [../]
[]

[Postprocessors]
  [./pos1]
    type = PointValue
    variable = disp_y
    point = '1.5 2.150080 2.0'
  [../]
  [./pos2]
    type = PointValue
    variable = disp_y
    point = '2.5 0.150080 3.0'
  [../]
[]

[Outputs]
  exodus = true
[]

(test/tests/transfers/multiapp_userobject_transfer/restricted_elem_master.i)

num_layers = 2

[Mesh]
  [box]
    type = GeneratedMeshGenerator
    dim = 3
    nx = ${num_layers}
    ny = 3
    nz = 3
  []
  # The MultiAppUserObjectTransfer object only works with ReplicatedMesh
  parallel_type = replicated
[]

[Variables]
  [u]
  []
[]

[Kernels]
  [td]
    type = TimeDerivative
    variable = u
  []

  [diff]
    type = Diffusion
    variable = u
  []
[]

[AuxVariables]
  [a]
    family = MONOMIAL
    order = CONSTANT
  []

  [s]
  []
[]

[AuxKernels]
  [s_ak]
    type = ParsedAux
    variable = s
    use_xyzt = true
    function = 'x+(z*z)'
  []
[]

[Functions]
[]

[Postprocessors]
  [a_avg]
    type = ElementAverageValue
    variable = a
  []
[]

[UserObjects]
  [S_avg_front]
    type = LayeredSideAverage
    boundary = front
    variable = s
    num_layers = ${num_layers}
    direction = x
  []

  [S_avg_back]
    type = LayeredSideAverage
    boundary = back
    variable = s
    num_layers = ${num_layers}
    direction = x
  []
[]

[MultiApps]
  [ch0]
    type = TransientMultiApp
    input_files = 'restricted_elem_sub.i'
    bounding_box_padding = '0 0.5 1'
    positions = '0 0.5 -0.1'
    output_in_position = true
    cli_args = 'yy=0'
  []
  [ch1]
    type = TransientMultiApp
    input_files = 'restricted_elem_sub.i'
    bounding_box_padding = '0 0.5 1'
    positions = '0 0.5  1.1'
    output_in_position = true
    cli_args = 'yy=1'
  []
[]

[Transfers]
  [from_ch0]
    type = MultiAppUserObjectTransfer
    boundary = back
    direction = from_multiapp
    multi_app = ch0
    variable = a
    user_object = A_avg
  []

  [from_ch1]
    type = MultiAppUserObjectTransfer
    boundary = front
    direction = from_multiapp
    multi_app = ch1
    variable = a
    user_object = A_avg
  []

  [to_ch0]
    type = MultiAppUserObjectTransfer
    block = 20
    direction = to_multiapp
    multi_app = ch0
    variable = S
    user_object = S_avg_back
  []

  [to_ch1]
    type = MultiAppUserObjectTransfer
    block = 20
    direction = to_multiapp
    multi_app = ch1
    variable = S
    user_object = S_avg_front
  []
[]

[Executioner]
  type = Transient
  num_steps = 2

  dt = 1
  nl_abs_tol = 1e-7
[]

[Outputs]
  exodus = true
[]

(test/tests/multiapps/picard/function_dt_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0
  ymin = 0
  xmax = 1
  ymax = 1
  nx = 10
  ny = 10
[]

[Functions]
  [./v_fn]
    type = ParsedFunction
    value = t*x
  [../]
  [./ffn]
    type = ParsedFunction
    value = x
  [../]

  [./dts]
    type = PiecewiseLinear
    x = '0.1  10'
    y = '0.1  10'
  [../]
[]

[AuxVariables]
  [./v]
  [../]
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
  [./ufn]
    type = BodyForce
    variable = u
    function = ffn
  [../]
[]

[BCs]
  [./all]
    type = FunctionDirichletBC
    variable = u
    boundary = 'left right top bottom'
    function = v_fn
  [../]
[]

[Executioner]
  type = Transient
  dt = 0.1
  solve_type = 'PJFNK'

  nl_abs_tol = 1e-10
  fixed_point_max_its = 2
  start_time = 0
  num_steps = 3
  [./TimeStepper]
    type = FunctionDT
    function = dts
  [../]
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub_app]
    app_type = MooseTestApp
    type = TransientMultiApp
    input_files = 'function_dt_sub.i'
    execute_on = timestep_end
    positions = '0 -1 0'
  [../]
[]

[Transfers]
  [./from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub_app
    source_variable = u
    variable = v
  [../]
[]

(test/tests/transfers/multiapp_postprocessor_interpolation_transfer/master_quad.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./pp_aux]
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 20
  dt = 0.1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./quad]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0.1 0.1 0 0.9 0.1 0 0.1 0.9 0 0.9 0.9 0'
    input_files = 'quad_sub1.i quad_sub1.i quad_sub2.i quad_sub2.i'
  [../]
[]

[Transfers]
  [./sub_to_master_pp]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = from_multiapp
    multi_app = quad
    variable = pp_aux
    postprocessor = pp
  [../]
[]

(test/tests/transfers/multiapp_postprocessor_interpolation_transfer/master2_quad.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./pp_aux]
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 20
  dt = 0.1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./quad]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0.1 0.1 0 0.9 0.1 0 0.1 0.9 0 0.9 0.9 0'
    input_files = 'quad_sub1.i'
  [../]
[]

[Transfers]
  [./sub_to_master_pp]
    type = MultiAppPostprocessorInterpolationTransfer
    direction = from_multiapp
    multi_app = quad
    variable = pp_aux
    postprocessor = pp
  [../]
[]

(test/tests/multiapps/restart_multilevel/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0
  ymin = 0
  xmax = 1
  ymax = 1
  nx = 10
  ny = 10
[]

[Functions]
  [./v_fn]
    type = ParsedFunction
    value = t*x
  [../]
  [./ffn]
    type = ParsedFunction
    value = x
  [../]
[]

[AuxVariables]
  [./v]
  [../]
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
  [./ufn]
    type = BodyForce
    variable = u
    function = ffn
  [../]
[]

[BCs]
  [./all]
    type = FunctionDirichletBC
    variable = u
    boundary = 'left right top bottom'
    function = v_fn
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 5
  dt = 0.1
  solve_type = 'PJFNK'
[]

[Outputs]
  exodus = true
  checkpoint = true
[]

[MultiApps]
  [./sub_app]
    app_type = MooseTestApp
    type = TransientMultiApp
    input_files = 'sub.i'
    execute_on = timestep_end
    positions = '0 -1 0'
  [../]
[]

[Transfers]
  [./from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub_app
    source_variable = u
    variable = v
  [../]
[]

(tutorials/tutorial02_multiapps/step01_multiapps/04_master_multiple.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [u]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
  [force]
    type = BodyForce
    variable = u
    value = 1.
  []
  [td]
    type = TimeDerivative
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 0
  []
[]

[Executioner]
  type = Transient
  end_time = 2
  dt = 1.

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub_app]
    type = TransientMultiApp
    positions   = '0 0 0  1 0 0  2 0 0'
#    positions_file = 04_positions.txt
    input_files = '04_sub1_multiple.i'
#    input_files = '04_sub1_multiple.i  04_sub2_multiple.i 04_sub3_multiple.i'
#    output_in_position = true
  []
[]

(test/tests/multiapps/restart_subapp_ic/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0
  ymin = 0
  xmax = 1
  ymax = 1
  nx = 10
  ny = 10
[]

[Functions]
  [./v_fn]
    type = ParsedFunction
    value = t*x
  [../]
  [./ffn]
    type = ParsedFunction
    value = x
  [../]
[]

[AuxVariables]
  [./v]
  [../]
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
  [./ufn]
    type = BodyForce
    variable = u
    function = ffn
  [../]
[]

[BCs]
  [./all]
    type = FunctionDirichletBC
    variable = u
    boundary = 'left right top bottom'
    function = v_fn
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 5
  dt = 0.1
  solve_type = 'PJFNK'
[]

[Outputs]
  exodus = true
  checkpoint = true
[]

[MultiApps]
  [./sub_app]
    app_type = MooseTestApp
    type = TransientMultiApp
    input_files = 'sub.i'
    execute_on = timestep_end
    positions = '0 -1 0'
  [../]
[]

[Transfers]
  [./from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub_app
    source_variable = u
    variable = v
  [../]
[]

(tutorials/tutorial02_multiapps/step01_multiapps/07_sub_multilevel.i)

[Mesh]
  type = GeneratedMesh
  dim = 3
  nx = 40
  ny = 40
  nz = 40
[]

[Variables]
  [v]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = v
  []
  [td]
    type = TimeDerivative
    variable = v
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = v
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = v
    boundary = right
    value = 1
  []
[]

[Executioner]
  type = Transient
  end_time = 2
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [dos]
    type = TransientMultiApp
    positions   = '0 0 0  1 0 0'
    input_files = '07_sub_sub_multilevel.i'
  []
[]

(test/tests/multiapps/steffensen_postprocessor/transient_main.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 5
  ny = 5
  parallel_type = replicated
  uniform_refine = 1
[]

[Variables]
  [u]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
  [time]
    type = TimeDerivative
    variable = u
  []
  [source]
    type = BodyForce
    variable = u
    value = 1
  []
[]

[BCs]
  [left]
    type = PostprocessorDirichletBC
    variable = u
    boundary = left
    postprocessor = 'from_sub'
  []
[]

[Postprocessors]
  [coupling_its]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  []
  [from_sub]
    type = Receiver
    default = 0
  []
  [to_sub]
    type = SideAverageValue
    variable = u
    boundary = right
  []
  [average]
    type = ElementAverageValue
    variable = u
  []
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  nl_abs_tol = 1e-14

  # App coupling parameters
  fixed_point_algorithm = 'steffensen'
  fixed_point_max_its = 30
  transformed_postprocessors = 'from_sub'
[]

[Outputs]
  csv = true
  exodus = false
[]

[MultiApps]
  [sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = 'transient_sub.i'
    clone_master_mesh = true
    execute_on = 'timestep_begin'
  []
[]

[Transfers]
  [left_from_sub]
    type = MultiAppPostprocessorTransfer
    direction = from_multiapp
    multi_app = sub
    from_postprocessor = 'to_main'
    to_postprocessor = 'from_sub'
    reduction_type = 'average'
  []
  [right_to_sub]
    type = MultiAppPostprocessorTransfer
    direction = to_multiapp
    multi_app = sub
    from_postprocessor = 'to_sub'
    to_postprocessor = 'from_main'
  []
[]

(test/tests/transfers/multiapp_userobject_transfer/tosub_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 3
  nx = 20
  ny = 20
  nz = 20
  # The MultiAppUserObjectTransfer object only works with ReplicatedMesh
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./layered_average_value]
    order = CONSTANT
    family = MONOMIAL
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[AuxKernels]
  [./layered_aux]
    type = SpatialUserObjectAux
    variable = layered_average_value
    execute_on = timestep_end
    user_object = layered_average
  [../]
[]

[BCs]
  [./bottom]
    type = DirichletBC
    variable = u
    boundary = bottom
    value = 0
  [../]
  [./top]
    type = DirichletBC
    variable = u
    boundary = top
    value = 1
  [../]
[]

[UserObjects]
  [./layered_average]
    type = LayeredAverage
    variable = u
    direction = y
    num_layers = 4
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub_app]
    execute_on = timestep_end
    positions = '0.3 0.1 0.3 0.7 0.1 0.3'
    type = TransientMultiApp
    input_files = tosub_sub.i
    app_type = MooseTestApp
  [../]
[]

[Transfers]
  [./layered_transfer]
    direction = to_multiapp
    user_object = layered_average
    variable = multi_layered_average
    type = MultiAppUserObjectTransfer
    multi_app = sub_app
  [../]
  [./element_layered_transfer]
    direction = to_multiapp
    user_object = layered_average
    variable = element_multi_layered_average
    type = MultiAppUserObjectTransfer
    multi_app = sub_app
  [../]
[]

(test/tests/transfers/multiapp_nearest_node_transfer/tosub_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  elem_type = QUAD8
[]

[Variables]
  [u]
    family = LAGRANGE
    order = FIRST
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
[]

[AuxVariables]
  [u_elemental]
    family = MONOMIAL
    order = CONSTANT
  []
[]

[AuxKernels]
  [fun_aux]
    type = FunctionAux
    function = 'x + y'
    variable = u_elemental
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '0.48 0.01 0'
    input_files = tosub_sub.i
  []
[]

[Transfers]
  [to_sub_nodal_to_nodal]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = nodal_source_from_master_nodal
  []
  [to_sub_nodal_to_elemental]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = nodal_source_from_master_elemental
  []
  [to_sub_elemental_to_nodal]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u_elemental
    variable = elemental_source_from_master_nodal
  []
  [to_sub_elemental_to_elemental]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u_elemental
    variable = elemental_source_from_master_elemental
  []
[]

(modules/functional_expansion_tools/examples/3D_volumetric_Cartesian_different_submesh/main.i)

# Derived from the example '3D_volumetric_Cartesian' with the following differences:
#
#   1) The number of x and y divisions in the sub app is not the same as the master app
#   2) The subapp mesh is skewed in x and z
[Mesh]
  type = GeneratedMesh
  dim = 3

  xmin = 0.0
  xmax = 10.0
  nx = 15

  ymin = 1.0
  ymax = 11.0
  ny = 25

  zmin = 2.0
  zmax = 12.0
  nz = 35
[]

[Variables]
  [./m]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[AuxVariables]
  [./s_in]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff_m]
    type = HeatConduction
    variable = m
  [../]
  [./time_diff_m]
    type = HeatConductionTimeDerivative
    variable = m
  [../]
  [./s_in] # Add in the contribution from the SubApp
    type = CoupledForce
    variable = m
    v = s_in
  [../]
[]

[AuxKernels]
  [./reconstruct_s_in]
    type = FunctionSeriesToAux
    variable = s_in
    function = FX_Basis_Value_Main
  [../]
[]

[Materials]
  [./Unobtanium]
    type = GenericConstantMaterial
    prop_names =  'thermal_conductivity specific_heat density'
    prop_values = '1.0                  1.0           1.0' # W/(cm K), J/(g K), g/cm^3
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    variable = m
    value = 1
  [../]
[]

[BCs]
  [./surround]
    type = DirichletBC
    variable = m
    value = 1
    boundary = 'top bottom left right front back'
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '3   4   5'
    physical_bounds = '0.0  10.0    1.0 11.0    2.0 12.0'
    x = Legendre
    y = Legendre
    z = Legendre
  [../]
[]

[UserObjects]
  [./FX_Value_UserObject_Main]
    type = FXVolumeUserObject
    function = FX_Basis_Value_Main
    variable = m
  [../]
[]

[Postprocessors]
  [./average_value]
    type = ElementAverageValue
    variable = m
  [../]
  [./peak_value]
    type = ElementExtremeValue
    value_type = max
    variable = m
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = sub.i
  [../]
[]

[Transfers]
  [./ValueToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Value_UserObject_Main
    multi_app_object_name = FX_Basis_Value_Sub
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
[]

(test/tests/controls/pid_control/pid_pp_control.i)

[Mesh]
  [square]
    type = GeneratedMeshGenerator
    nx = 2
    ny = 2
    dim = 2
  []
[]

[Variables]
  [u]
  []
[]

[Kernels]
  inactive = 'exception'
  [diff]
    type = CoefDiffusion
    variable = u
    coef = 1
  []

  [exception]
    type = NanKernel
    variable = 'u'
    timestep_to_nan = 2
  []
[]

[BCs]
  [left]
    type = PostprocessorDirichletBC
    variable = u
    boundary = 3
    postprocessor = received_bc
  []

  [right]
    type = DirichletBC
    variable = u
    boundary = 1
    value = 1
  []
[]

[Functions]
  [conditional_function]
    type = ParsedFunction
    value = 't >= 1.9 & t < 2.1'
  []
[]

[Executioner]
  type = Transient

  solve_type = 'PJFNK'
  start_time = 0.0
  num_steps = 20
  dt = 1

  nl_abs_tol = 1e-10
  line_search = 'none'

  # For picard tests
  picard_abs_tol = 1e-3
[]

[Postprocessors]
  [integral]
    type = ElementIntegralVariablePostprocessor
    variable = u
  []
  [received_bc]
    type = Receiver
    default = 0
  []
[]

[Controls]
  inactive = 'make_crash'
  [integral_value]
    type = PIDTransientControl
    postprocessor = integral
    target = 1.5
    parameter_pp = 'received_bc'
    K_integral = -1
    K_proportional = -1
    K_derivative = -0.1
  []
  [make_crash]
    type = ConditionalFunctionEnableControl
    enable_objects = 'Kernels::exception'
    conditional_function = 'conditional_function'
    execute_on = 'timestep_begin'
  []
[]

[MultiApps]
  inactive = 'shortest_app'
  [shortest_app]
    type = TransientMultiApp
    input_files = 'pid_pp_control_subapp.i'
  []
[]

[Outputs]
  file_base = out
  exodus = false
  csv = true
[]

(test/tests/multiapps/grid-sequencing/fine.i)

[Mesh]
  type = GeneratedMesh
  dim = 1
  nx = 40
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [time]
    type = TimeDerivative
    variable = u
  []
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [rxn]
    type = Reaction
    variable = u
  []
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]


[Executioner]
  type = Transient
  num_steps = 2
  dt = 1

  solve_type = 'PJFNK'
  petsc_options = '-snes_monitor_solution'
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./coarse]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_begin
    positions = '0 0 0'
    input_files = coarse.i
  [../]
[]

[Transfers]
  [./mesh_function_begin]
    type = MultiAppMeshFunctionTransfer
    direction = from_multiapp
    multi_app = coarse
    source_variable = u
    variable = u
    execute_on = timestep_begin
  [../]
[]

(test/tests/transfers/multiapp_postprocessor_interpolation_transfer/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [u]
  []
[]

[AuxVariables]
  [from_sub]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub]
    positions = '0.2 0.2 0 0.7 0.7 0'
    type = TransientMultiApp
    app_type = MooseTestApp
    input_files = 'sub0.i sub1.i'
  []
[]

[Transfers]
  [pp_transfer]
    direction = from_multiapp
    postprocessor = average
    variable = from_sub
    type = MultiAppPostprocessorInterpolationTransfer
    multi_app = sub
  []
[]

(test/tests/transfers/multiapp_userobject_transfer/two_pipe_master.i)

[Mesh]
  [gen]
    type = GeneratedMeshGenerator
    dim = 3
    xmin = 0
    xmax = 5
    nx = 5

    ymin = 0
    ymax = 5
    ny = 5

    zmin = 0
    zmax = 5
    nz = 5
  []
  [./blocks]
    input = gen
    type = SubdomainBoundingBoxGenerator
    block_id = 1
    bottom_left = '1 1 0'
    top_right = '4 4 5'
  [../]
[]

[AuxVariables]
  [./from_sub_app_var]
    order = CONSTANT
    family = MONOMIAL
    block = 1
    initial_condition = 0
  [../]
[]

[Variables]
  [u]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
  [td]
    type = TimeDerivative
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = front
    value = -1
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = back
    value = 1
  []
[]

[Executioner]
  type = Transient
  num_steps = 2
  dt = 5

  solve_type = 'NEWTON'
  l_tol = 1e-8
  nl_rel_tol = 1e-10
[]

[Outputs]
  exodus = true
  execute_on = final
[]

[MultiApps]
  [sub_app]
    type = TransientMultiApp
    positions = '0 0 0'
    input_files = two_pipe_sub.i
    app_type = MooseTestApp
    execute_on = TIMESTEP_END
  []
[]

[Transfers]
  [layered_transfer_from_sub_app]
    type = MultiAppUserObjectTransfer
    direction = from_multiapp
    user_object = sub_app_uo
    variable = from_sub_app_var
    multi_app = sub_app
    displaced_source_mesh = true
    skip_bounding_box_check = true
  []
[]

(modules/functional_expansion_tools/examples/2D_interface/main.i)

# Basic example coupling a master and sub app at an interface in a 2D model.
# The master app provides a flux term to the sub app via Functional Expansions, which then performs
# its calculations.  The sub app's interface conditions, both value and flux, are transferred back
# to the master app
[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0.0
  xmax = 0.4
  nx = 6
  ymin = 0.0
  ymax = 10.0
  ny = 20
[]

[Variables]
  [./m]
  [../]
[]

[Kernels]
  [./diff_m]
    type = HeatConduction
    variable = m
  [../]
  [./time_diff_m]
    type = HeatConductionTimeDerivative
    variable = m
  [../]
  [./source_m]
    type = BodyForce
    variable = m
    value = 100
  [../]
[]

[Materials]
  [./Impervium]
    type = GenericConstantMaterial
    prop_names =  'thermal_conductivity specific_heat density'
    prop_values = '0.00001              50.0          100.0' # W/(cm K), J/(g K), g/cm^3
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    value = 2
    variable = m
  [../]
[]

[BCs]
  [./interface_value]
    type = FXValueBC
    variable = m
    boundary = right
    function = FX_Basis_Value_Main
  [../]
  [./interface_flux]
    type = FXFluxBC
    boundary = right
    variable = m
    function = FX_Basis_Flux_Main
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '4'
    physical_bounds = '0.0 10'
    y = Legendre
  [../]
  [./FX_Basis_Flux_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '5'
    physical_bounds = '0.0 10'
    y = Legendre
  [../]
[]

[UserObjects]
  [./FX_Flux_UserObject_Main]
    type = FXBoundaryFluxUserObject
    function = FX_Basis_Flux_Main
    variable = m
    boundary = right
    diffusivity = thermal_conductivity
  [../]
[]

[Postprocessors]
  [./average_interface_value]
    type = SideAverageValue
    variable = m
    boundary = right
  [../]
  [./total_flux]
    type = SideDiffusiveFluxIntegral
    variable = m
    boundary = right
    diffusivity = thermal_conductivity
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 1.0
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = sub.i
    sub_cycling = true
  [../]
[]

[Transfers]
  [./FluxToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Flux_UserObject_Main
    multi_app_object_name = FX_Basis_Flux_Sub
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
  [./FluxToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Flux_Main
    multi_app_object_name = FX_Flux_UserObject_Sub
  [../]
[]

(test/tests/multiapps/picard_failure/picard_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 2
  ny = 2
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./v]
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
  [./force_u]
    type = CoupledForce
    variable = u
    v = v
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Postprocessors]
  [picard_its]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 2
  dt = 0.1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_abs_tol = 1e-14
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  active = 'sub' # will be modified by CLI overrides
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = picard_sub.i
  [../]
  [./sub_no_fail]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = picard_sub_no_fail.i
  [../]
[]

[Transfers]
  [./v_from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = v
    variable = v
  [../]
  [./u_to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = u
  [../]
[]

(test/tests/multiapps/relaxation/picard_relaxed_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./v]
    initial_condition = 1
  [../]
  [./inverse_v]
    initial_condition = 1
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
  [./force_u]
    type = CoupledForce
    variable = u
    v = inverse_v
  [../]
[]

[AuxKernels]
  [./invert_v]
    type = QuotientAux
    variable = inverse_v
    denominator = v
    numerator = 20.0
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./Neumann_right]
    type = NeumannBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Postprocessors]
  [picard_its]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 4
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_abs_tol = 1e-14
  relaxation_factor = 0.95
  transformed_variables = u
[]

[Outputs]
  exodus = true
  execute_on = 'INITIAL TIMESTEP_END'
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_begin
    positions = '0 0 0'
    input_files = picard_relaxed_sub.i
  [../]
[]

[Transfers]
  [./v_from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = v
    variable = v
  [../]
  [./u_to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = u
  [../]
[]

(test/tests/multiapps/reset/multilevel_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.01

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '1 1 0'
    input_files = multilevel_sub.i
    output_in_position = true
    reset_apps = 0
    reset_time = 0.05
  [../]
[]

(test/tests/outputs/output_if_base_contains/dt_from_master_sub.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0 0.5 0.5 0'
    input_files = dt_from_master_subsub.i
  [../]
[]

(test/tests/transfers/multiapp_scalar_to_auxscalar_transfer/from_sub/master_wrong_order.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[AuxVariables]
  [./a]
    family = SCALAR
    order = SIXTH
  [../]
[]

[Variables]
  [./dummy]
  [../]
[]

[Kernels]
  [./dummy]
    type = Diffusion
    variable = dummy
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    positions = '0 0 0'
    input_files = 'sub_wrong_order.i'
  [../]
[]

[Transfers]
  [./from_sub]
    type = MultiAppScalarToAuxScalarTransfer
    multi_app = sub
    source_variable = 'b'
    to_aux_scalar = 'a'
    direction = from_multiapp
  [../]
[]

[Outputs]
    exodus = true
[]

(test/tests/transfers/multiapp_projection_transfer/fromsub_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0
  ymin = 0
  xmax = 9
  ymax = 9
  nx = 9
  ny = 9
[]

[Variables]
  [u]
  []
[]

[AuxVariables]
  [v_nodal]
  []
  [v_elemental]
    order = CONSTANT
    family = MONOMIAL
  []
  [x_nodal]
  []
  [x_elemental]
    order = CONSTANT
    family = MONOMIAL
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1
  solve_type = 'NEWTON'
[]

[Outputs]
  [out]
    type = Exodus
    elemental_as_nodal = true
  []
[]

[MultiApps]
  [sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '1 1 0 5 5 0'
    input_files = fromsub_sub.i
  []
[]

[Transfers]
  [v_nodal_tr]
    type = MultiAppProjectionTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = v
    variable = v_nodal
  []
  [v_elemental_tr]
    type = MultiAppProjectionTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = v
    variable = v_elemental
  []
  [x_elemental_tr]
    type = MultiAppProjectionTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = x
    variable = x_elemental
  []
  [x_nodal_tr]
    type = MultiAppProjectionTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = x
    variable = x_nodal
  []
[]

(test/tests/multiapps/restart_multilevel/sub.i)

[Mesh]
  type = GeneratedMesh
  dim = 1
  xmin = 0
  xmax = 1
  nx = 10
[]

[Functions]
  [./u_fn]
    type = ParsedFunction
    value = t*x
  [../]
  [./ffn]
    type = ParsedFunction
    value = x
  [../]
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./v]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
  [./fn]
    type = BodyForce
    variable = u
    function = ffn
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = FunctionDirichletBC
    variable = u
    boundary = right
    function = u_fn
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 5
  dt = 0.1
  solve_type = 'PJFNK'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub_app]
    app_type = MooseTestApp
    type = TransientMultiApp
    input_files = 'subsub.i'
    execute_on = timestep_end
    positions = '0 -1 0'
  [../]
[]

[Transfers]
  [./from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub_app
    source_variable = u
    variable = v
  [../]
[]

(modules/porous_flow/examples/multiapp_fracture_flow/diffusion_multiapp/fracture_app_heat.i)

# Heat energy from this fracture app is transferred to the matrix app
[Mesh]
  [generate]
    type = GeneratedMeshGenerator
    dim = 1
    nx = 100
    xmin = 0
    xmax = 50.0
  []
[]

[Variables]
  [frac_T]
  []
[]

[ICs]
  [frac_T]
    type = FunctionIC
    variable = frac_T
    function = 'if(x<1E-6, 2, 0)'  # delta function
  []
[]

[AuxVariables]
  [transferred_matrix_T]
  []
  [heat_to_matrix]
  []
[]

[Kernels]
  [dot]
    type = TimeDerivative
    variable = frac_T
  []
  [fracture_diffusion]
    type = Diffusion
    variable = frac_T
  []
  [toMatrix]
    type = PorousFlowHeatMassTransfer
    variable = frac_T
    v = transferred_matrix_T
    transfer_coefficient = 0.004
  []
[]

[AuxKernels]
  [heat_to_matrix]
    type = ParsedAux
    variable = heat_to_matrix
    args = 'frac_T transferred_matrix_T'
    function = '0.004 * (frac_T - transferred_matrix_T)'
  []
[]

[Preconditioning]
  [entire_jacobian]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  solve_type = NEWTON
  dt = 100
  end_time = 100
[]

[VectorPostprocessors]
  [final_results]
    type = LineValueSampler
    start_point = '0 0 0'
    end_point = '50 0 0'
    num_points = 11
    sort_by = x
    variable = frac_T
    outputs = final_csv
  []
[]

[Outputs]
  print_linear_residuals = false
  [final_csv]
    type = CSV
    sync_times = 100
    sync_only = true
  []
[]

[MultiApps]
  [matrix_app]
    type = TransientMultiApp
    input_files = matrix_app_heat.i
    execute_on = TIMESTEP_END
  []
[]

[Transfers]
  [heat_to_matrix]
    type = MultiAppCopyTransfer
    direction = to_multiapp
    multi_app = matrix_app
    source_variable = heat_to_matrix
    variable = heat_from_frac
  []
  [T_from_matrix]
    type = MultiAppCopyTransfer
    direction = from_multiapp
    multi_app = matrix_app
    source_variable = matrix_T
    variable = transferred_matrix_T
  []
[]

(test/tests/multiapps/picard/picard_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 5
  ny = 5
  parallel_type = replicated
  uniform_refine = 1
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./v]
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
  [./force_u]
    type = CoupledForce
    variable = u
    v = v
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Postprocessors]
  [picard_its]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 20
  dt = 0.1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_abs_tol = 1e-14
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = picard_sub.i
    clone_master_mesh = true
  [../]
[]

[Transfers]
  [./v_from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = v
    variable = v
  [../]
  [./u_to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = u
  [../]
[]

(test/tests/transfers/multiapp_nearest_node_transfer/parallel_master.i)

# This test was introduced for Issue #804 which saw data corruption
# during NearestNodeTransfer when running in parallel

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 100
  ny = 100
  parallel_type = replicated
[]

[Variables]
  [./u]
     order = FIRST
     family = LAGRANGE
  [../]
[]

[AuxVariables]
  [./from_sub]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 1.0 0.0'
    input_files = parallel_sub.i
    execute_on = 'timestep_end'
   [../]
[]

[Transfers]
# Surface to volume data transfer
  [./from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u
    variable = from_sub
    execute_on = 'timestep_end'
  [../]
[]

(modules/combined/examples/geochem-porous_flow/geotes_weber_tensleep/porous_flow.i)

#########################################
#                                       #
# File written by create_input_files.py #
#                                       #
#########################################
# PorousFlow simulation of injection and production in a simplified GeoTES aquifer
# Much of this file is standard porous-flow stuff.  The unusual aspects are:
# - transfer of the rates of changes of each species (kg.s) to the aquifer_geochemistry.i simulation.  This is achieved by saving these changes from the PorousFlowMassTimeDerivative residuals
# - transfer of the temperature field to the aquifer_geochemistry.i simulation
# Interesting behaviour can be simulated by this file without its 'parent' simulation, exchanger.i.  exchanger.i provides mass-fractions injected via the injection_rate_massfrac_* variables, but since these are more-or-less constant throughout the duration of the exchanger.i simulation, the initial_conditions specified below may be used.  Similar, exchanger.i provides injection_temperature, but that is also constant.
injection_rate = -0.02 # kg/s/m, negative because injection as a source
production_rate = 0.02 # kg/s/m, this is about the maximum that can be sustained by the aquifer, with its fairly low permeability, without porepressure becoming negative
[Mesh]
  [gen]
    type = GeneratedMeshGenerator
    dim = 3
    xmin = -75
    xmax = 75
    ymin = 0
    ymax = 40
    zmin = -25
    zmax = 25
    nx = 15
    ny = 4
    nz = 5
  []
  [aquifer]
    type = ParsedSubdomainMeshGenerator
    input = gen
    block_id = 1
    block_name = aquifer
    combinatorial_geometry = 'z >= -5 & z <= 5'
  []
  [injection_nodes]
    input = aquifer
    type = ExtraNodesetGenerator
    new_boundary = injection_nodes
    coord = '-25 0 -5; -25 0 5'
  []
  [production_nodes]
    input = injection_nodes
    type = ExtraNodesetGenerator
    new_boundary = production_nodes
    coord = '25 0 -5; 25 0 5'
  []
[]

[GlobalParams]
  PorousFlowDictator = dictator
  gravity = '0 0 -10'
[]

[BCs]
  [injection_temperature]
    type = MatchedValueBC
    variable = temperature
    v = injection_temperature
    boundary = injection_nodes
  []
[]

[Modules]
  [FluidProperties]
    [the_simple_fluid]
      type = SimpleFluidProperties
      thermal_expansion = 0
      bulk_modulus = 2E9
      viscosity = 1E-3
      density0 = 1000
      cv = 4000.0
      cp = 4000.0
    []
  []
[]

[PorousFlowFullySaturated]
  coupling_type = ThermoHydro
  porepressure = porepressure
  temperature = temperature
  mass_fraction_vars = 'f_H f_Cl f_SO4 f_HCO3 f_SiO2aq f_Al f_Ca f_Mg f_Fe f_K f_Na f_Sr f_F f_BOH f_Br f_Ba f_Li f_NO3 f_O2aq '
  save_component_rate_in = 'rate_H rate_Cl rate_SO4 rate_HCO3 rate_SiO2aq rate_Al rate_Ca rate_Mg rate_Fe rate_K rate_Na rate_Sr rate_F rate_BOH rate_Br rate_Ba rate_Li rate_NO3 rate_O2aq rate_H2O' # change in kg at every node / dt
  fp = the_simple_fluid
  temperature_unit = Celsius
[]

[Materials]
  [porosity_caps]
    type = PorousFlowPorosityConst # this simulation has no porosity changes from dissolution
    block = 0
    porosity = 0.01
  []
  [porosity_aquifer]
    type = PorousFlowPorosityConst # this simulation has no porosity changes from dissolution
    block = aquifer
    porosity = 0.063
  []
  [permeability_caps]
    type = PorousFlowPermeabilityConst
    block = 0
    permeability = '1E-18 0 0   0 1E-18 0   0 0 1E-18'
  []
  [permeability_aquifer]
    type = PorousFlowPermeabilityConst
    block = aquifer
    permeability = '1.7E-15 0 0   0 1.7E-15 0   0 0 4.1E-16'
  []
  [thermal_conductivity]
    type = PorousFlowThermalConductivityIdeal
    dry_thermal_conductivity = '0 0 0  0 0 0  0 0 0'
  []
  [rock_heat]
    type = PorousFlowMatrixInternalEnergy
    density = 2500.0
    specific_heat_capacity = 1200.0
  []
[]

[Preconditioning]
  active = typically_efficient
  [typically_efficient]
    type = SMP
    full = true
    petsc_options_iname = '-pc_type -pc_hypre_type'
    petsc_options_value = ' hypre    boomeramg'
  []
  [strong]
    type = SMP
    full = true
    petsc_options = '-ksp_diagonal_scale -ksp_diagonal_scale_fix'
    petsc_options_iname = '-pc_type -sub_pc_type -sub_pc_factor_shift_type -pc_asm_overlap'
    petsc_options_value = ' asm      ilu           NONZERO                   2'
  []
  [probably_too_strong]
    type = SMP
    full = true
    petsc_options_iname = '-pc_type -pc_factor_mat_solver_package'
    petsc_options_value = ' lu       mumps'
  []
[]

[Executioner]
  type = Transient
  solve_type = Newton
  end_time = 7.76E6 # 90 days
  [TimeStepper]
    type = FunctionDT
    function = 'min(3E4, max(1E4, 0.2 * t))'
  []
[]

[Outputs]
  exodus = true
[]

[Variables]
  [f_H]
    initial_condition = -2.952985071156e-06
  []
  [f_Cl]
    initial_condition = 0.04870664551708
  []
  [f_SO4]
    initial_condition = 0.0060359986852517
  []
  [f_HCO3]
    initial_condition = 5.0897287594019e-05
  []
  [f_SiO2aq]
    initial_condition = 3.0246609868421e-05
  []
  [f_Al]
    initial_condition = 3.268028901929e-08
  []
  [f_Ca]
    initial_condition = 0.00082159428184586
  []
  [f_Mg]
    initial_condition = 1.8546347062146e-05
  []
  [f_Fe]
    initial_condition = 4.3291908204093e-05
  []
  [f_K]
    initial_condition = 6.8434768308898e-05
  []
  [f_Na]
    initial_condition = 0.033298053919671
  []
  [f_Sr]
    initial_condition = 1.2771866652177e-05
  []
  [f_F]
    initial_condition = 5.5648860174073e-06
  []
  [f_BOH]
    initial_condition = 0.0003758574621917
  []
  [f_Br]
    initial_condition = 9.0315286107068e-05
  []
  [f_Ba]
    initial_condition = 1.5637460875161e-07
  []
  [f_Li]
    initial_condition = 8.3017067912701e-05
  []
  [f_NO3]
    initial_condition = 0.00010958455036169
  []
  [f_O2aq]
    initial_condition = -7.0806852373351e-05
  []
  [porepressure]
    initial_condition = 30E6
  []
  [temperature]
    initial_condition = 92
    scaling = 1E-6 # fluid enthalpy is roughly 1E6
  []
[]

[DiracKernels]
  [inject_H]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_H
    point_file = injection.bh
    variable = f_H
  []
  [inject_Cl]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_Cl
    point_file = injection.bh
    variable = f_Cl
  []
  [inject_SO4]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_SO4
    point_file = injection.bh
    variable = f_SO4
  []
  [inject_HCO3]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_HCO3
    point_file = injection.bh
    variable = f_HCO3
  []
  [inject_SiO2aq]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_SiO2aq
    point_file = injection.bh
    variable = f_SiO2aq
  []
  [inject_Al]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_Al
    point_file = injection.bh
    variable = f_Al
  []
  [inject_Ca]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_Ca
    point_file = injection.bh
    variable = f_Ca
  []
  [inject_Mg]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_Mg
    point_file = injection.bh
    variable = f_Mg
  []
  [inject_Fe]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_Fe
    point_file = injection.bh
    variable = f_Fe
  []
  [inject_K]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_K
    point_file = injection.bh
    variable = f_K
  []
  [inject_Na]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_Na
    point_file = injection.bh
    variable = f_Na
  []
  [inject_Sr]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_Sr
    point_file = injection.bh
    variable = f_Sr
  []
  [inject_F]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_F
    point_file = injection.bh
    variable = f_F
  []
  [inject_BOH]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_BOH
    point_file = injection.bh
    variable = f_BOH
  []
  [inject_Br]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_Br
    point_file = injection.bh
    variable = f_Br
  []
  [inject_Ba]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_Ba
    point_file = injection.bh
    variable = f_Ba
  []
  [inject_Li]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_Li
    point_file = injection.bh
    variable = f_Li
  []
  [inject_NO3]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_NO3
    point_file = injection.bh
    variable = f_NO3
  []
  [inject_O2aq]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_O2aq
    point_file = injection.bh
    variable = f_O2aq
  []
  [inject_H2O]
    type = PorousFlowPolyLineSink
    SumQuantityUO = injected_mass
    fluxes = ${injection_rate}
    p_or_t_vals = 0.0
    multiplying_var = injection_rate_massfrac_H2O
    point_file = injection.bh
    variable = porepressure
  []

  [produce_H]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_H
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 0
    point_file = production.bh
    variable = f_H
  []
  [produce_Cl]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_Cl
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 1
    point_file = production.bh
    variable = f_Cl
  []
  [produce_SO4]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_SO4
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 2
    point_file = production.bh
    variable = f_SO4
  []
  [produce_HCO3]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_HCO3
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 3
    point_file = production.bh
    variable = f_HCO3
  []
  [produce_SiO2aq]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_SiO2aq
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 4
    point_file = production.bh
    variable = f_SiO2aq
  []
  [produce_Al]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_Al
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 5
    point_file = production.bh
    variable = f_Al
  []
  [produce_Ca]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_Ca
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 6
    point_file = production.bh
    variable = f_Ca
  []
  [produce_Mg]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_Mg
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 7
    point_file = production.bh
    variable = f_Mg
  []
  [produce_Fe]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_Fe
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 8
    point_file = production.bh
    variable = f_Fe
  []
  [produce_K]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_K
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 9
    point_file = production.bh
    variable = f_K
  []
  [produce_Na]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_Na
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 10
    point_file = production.bh
    variable = f_Na
  []
  [produce_Sr]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_Sr
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 11
    point_file = production.bh
    variable = f_Sr
  []
  [produce_F]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_F
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 12
    point_file = production.bh
    variable = f_F
  []
  [produce_BOH]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_BOH
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 13
    point_file = production.bh
    variable = f_BOH
  []
  [produce_Br]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_Br
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 14
    point_file = production.bh
    variable = f_Br
  []
  [produce_Ba]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_Ba
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 15
    point_file = production.bh
    variable = f_Ba
  []
  [produce_Li]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_Li
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 16
    point_file = production.bh
    variable = f_Li
  []
  [produce_NO3]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_NO3
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 17
    point_file = production.bh
    variable = f_NO3
  []
  [produce_O2aq]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_O2aq
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 18
    point_file = production.bh
    variable = f_O2aq
  []
  [produce_H2O]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_mass_H2O
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    mass_fraction_component = 19
    point_file = production.bh
    variable = porepressure
  []
  [produce_heat]
    type = PorousFlowPolyLineSink
    SumQuantityUO = produced_heat
    fluxes = ${production_rate}
    p_or_t_vals = 0.0
    use_enthalpy = true
    point_file = production.bh
    variable = temperature
  []
[]

[UserObjects]
  [injected_mass]
    type = PorousFlowSumQuantity
  []
  [produced_mass_H]
    type = PorousFlowSumQuantity
  []
  [produced_mass_Cl]
    type = PorousFlowSumQuantity
  []
  [produced_mass_SO4]
    type = PorousFlowSumQuantity
  []
  [produced_mass_HCO3]
    type = PorousFlowSumQuantity
  []
  [produced_mass_SiO2aq]
    type = PorousFlowSumQuantity
  []
  [produced_mass_Al]
    type = PorousFlowSumQuantity
  []
  [produced_mass_Ca]
    type = PorousFlowSumQuantity
  []
  [produced_mass_Mg]
    type = PorousFlowSumQuantity
  []
  [produced_mass_Fe]
    type = PorousFlowSumQuantity
  []
  [produced_mass_K]
    type = PorousFlowSumQuantity
  []
  [produced_mass_Na]
    type = PorousFlowSumQuantity
  []
  [produced_mass_Sr]
    type = PorousFlowSumQuantity
  []
  [produced_mass_F]
    type = PorousFlowSumQuantity
  []
  [produced_mass_BOH]
    type = PorousFlowSumQuantity
  []
  [produced_mass_Br]
    type = PorousFlowSumQuantity
  []
  [produced_mass_Ba]
    type = PorousFlowSumQuantity
  []
  [produced_mass_Li]
    type = PorousFlowSumQuantity
  []
  [produced_mass_NO3]
    type = PorousFlowSumQuantity
  []
  [produced_mass_O2aq]
    type = PorousFlowSumQuantity
  []
  [produced_mass_H2O]
    type = PorousFlowSumQuantity
  []
  [produced_heat]
    type = PorousFlowSumQuantity
  []
[]

[Postprocessors]
  [dt]
    type = TimestepSize
    execute_on = TIMESTEP_BEGIN
  []
  [tot_kg_injected_this_timestep]
    type = PorousFlowPlotQuantity
    uo = injected_mass
  []
  [kg_H_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_H
  []
  [kg_Cl_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_Cl
  []
  [kg_SO4_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_SO4
  []
  [kg_HCO3_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_HCO3
  []
  [kg_SiO2aq_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_SiO2aq
  []
  [kg_Al_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_Al
  []
  [kg_Ca_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_Ca
  []
  [kg_Mg_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_Mg
  []
  [kg_Fe_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_Fe
  []
  [kg_K_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_K
  []
  [kg_Na_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_Na
  []
  [kg_Sr_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_Sr
  []
  [kg_F_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_F
  []
  [kg_BOH_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_BOH
  []
  [kg_Br_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_Br
  []
  [kg_Ba_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_Ba
  []
  [kg_Li_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_Li
  []
  [kg_NO3_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_NO3
  []
  [kg_O2aq_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_O2aq
  []
  [kg_H2O_produced_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_mass_H2O
  []
  [mole_rate_H_produced]
    type = FunctionValuePostprocessor
    function = moles_H
  []
  [mole_rate_Cl_produced]
    type = FunctionValuePostprocessor
    function = moles_Cl
  []
  [mole_rate_SO4_produced]
    type = FunctionValuePostprocessor
    function = moles_SO4
  []
  [mole_rate_HCO3_produced]
    type = FunctionValuePostprocessor
    function = moles_HCO3
  []
  [mole_rate_SiO2aq_produced]
    type = FunctionValuePostprocessor
    function = moles_SiO2aq
  []
  [mole_rate_Al_produced]
    type = FunctionValuePostprocessor
    function = moles_Al
  []
  [mole_rate_Ca_produced]
    type = FunctionValuePostprocessor
    function = moles_Ca
  []
  [mole_rate_Mg_produced]
    type = FunctionValuePostprocessor
    function = moles_Mg
  []
  [mole_rate_Fe_produced]
    type = FunctionValuePostprocessor
    function = moles_Fe
  []
  [mole_rate_K_produced]
    type = FunctionValuePostprocessor
    function = moles_K
  []
  [mole_rate_Na_produced]
    type = FunctionValuePostprocessor
    function = moles_Na
  []
  [mole_rate_Sr_produced]
    type = FunctionValuePostprocessor
    function = moles_Sr
  []
  [mole_rate_F_produced]
    type = FunctionValuePostprocessor
    function = moles_F
  []
  [mole_rate_BOH_produced]
    type = FunctionValuePostprocessor
    function = moles_BOH
  []
  [mole_rate_Br_produced]
    type = FunctionValuePostprocessor
    function = moles_Br
  []
  [mole_rate_Ba_produced]
    type = FunctionValuePostprocessor
    function = moles_Ba
  []
  [mole_rate_Li_produced]
    type = FunctionValuePostprocessor
    function = moles_Li
  []
  [mole_rate_NO3_produced]
    type = FunctionValuePostprocessor
    function = moles_NO3
  []
  [mole_rate_O2aq_produced]
    type = FunctionValuePostprocessor
    function = moles_O2aq
  []
  [mole_rate_H2O_produced]
    type = FunctionValuePostprocessor
    function = moles_H2O
  []
  [heat_joules_extracted_this_timestep]
    type = PorousFlowPlotQuantity
    uo = produced_heat
  []
  [production_temperature]
    type = AverageNodalVariableValue
    boundary = production_nodes
    variable = temperature
  []
[]

[Functions]
  [moles_H]
    type = ParsedFunction
    vars = 'kg_H dt'
    vals = 'kg_H_produced_this_timestep dt'
    value = 'kg_H * 1000 / 1.0079 / dt'
  []
  [moles_Cl]
    type = ParsedFunction
    vars = 'kg_Cl dt'
    vals = 'kg_Cl_produced_this_timestep dt'
    value = 'kg_Cl * 1000 / 35.453 / dt'
  []
  [moles_SO4]
    type = ParsedFunction
    vars = 'kg_SO4 dt'
    vals = 'kg_SO4_produced_this_timestep dt'
    value = 'kg_SO4 * 1000 / 96.0576 / dt'
  []
  [moles_HCO3]
    type = ParsedFunction
    vars = 'kg_HCO3 dt'
    vals = 'kg_HCO3_produced_this_timestep dt'
    value = 'kg_HCO3 * 1000 / 61.0171 / dt'
  []
  [moles_SiO2aq]
    type = ParsedFunction
    vars = 'kg_SiO2aq dt'
    vals = 'kg_SiO2aq_produced_this_timestep dt'
    value = 'kg_SiO2aq * 1000 / 60.0843 / dt'
  []
  [moles_Al]
    type = ParsedFunction
    vars = 'kg_Al dt'
    vals = 'kg_Al_produced_this_timestep dt'
    value = 'kg_Al * 1000 / 26.9815 / dt'
  []
  [moles_Ca]
    type = ParsedFunction
    vars = 'kg_Ca dt'
    vals = 'kg_Ca_produced_this_timestep dt'
    value = 'kg_Ca * 1000 / 40.08 / dt'
  []
  [moles_Mg]
    type = ParsedFunction
    vars = 'kg_Mg dt'
    vals = 'kg_Mg_produced_this_timestep dt'
    value = 'kg_Mg * 1000 / 24.305 / dt'
  []
  [moles_Fe]
    type = ParsedFunction
    vars = 'kg_Fe dt'
    vals = 'kg_Fe_produced_this_timestep dt'
    value = 'kg_Fe * 1000 / 55.847 / dt'
  []
  [moles_K]
    type = ParsedFunction
    vars = 'kg_K dt'
    vals = 'kg_K_produced_this_timestep dt'
    value = 'kg_K * 1000 / 39.0983 / dt'
  []
  [moles_Na]
    type = ParsedFunction
    vars = 'kg_Na dt'
    vals = 'kg_Na_produced_this_timestep dt'
    value = 'kg_Na * 1000 / 22.9898 / dt'
  []
  [moles_Sr]
    type = ParsedFunction
    vars = 'kg_Sr dt'
    vals = 'kg_Sr_produced_this_timestep dt'
    value = 'kg_Sr * 1000 / 87.62 / dt'
  []
  [moles_F]
    type = ParsedFunction
    vars = 'kg_F dt'
    vals = 'kg_F_produced_this_timestep dt'
    value = 'kg_F * 1000 / 18.9984 / dt'
  []
  [moles_BOH]
    type = ParsedFunction
    vars = 'kg_BOH dt'
    vals = 'kg_BOH_produced_this_timestep dt'
    value = 'kg_BOH * 1000 / 61.8329 / dt'
  []
  [moles_Br]
    type = ParsedFunction
    vars = 'kg_Br dt'
    vals = 'kg_Br_produced_this_timestep dt'
    value = 'kg_Br * 1000 / 79.904 / dt'
  []
  [moles_Ba]
    type = ParsedFunction
    vars = 'kg_Ba dt'
    vals = 'kg_Ba_produced_this_timestep dt'
    value = 'kg_Ba * 1000 / 137.33 / dt'
  []
  [moles_Li]
    type = ParsedFunction
    vars = 'kg_Li dt'
    vals = 'kg_Li_produced_this_timestep dt'
    value = 'kg_Li * 1000 / 6.941 / dt'
  []
  [moles_NO3]
    type = ParsedFunction
    vars = 'kg_NO3 dt'
    vals = 'kg_NO3_produced_this_timestep dt'
    value = 'kg_NO3 * 1000 / 62.0049 / dt'
  []
  [moles_O2aq]
    type = ParsedFunction
    vars = 'kg_O2aq dt'
    vals = 'kg_O2aq_produced_this_timestep dt'
    value = 'kg_O2aq * 1000 / 31.9988 / dt'
  []
  [moles_H2O]
    type = ParsedFunction
    vars = 'kg_H2O dt'
    vals = 'kg_H2O_produced_this_timestep dt'
    value = 'kg_H2O * 1000 / 18.01801802 / dt'
  []
[]

[AuxVariables]
  [injection_temperature]
    initial_condition = 92
  []
  [injection_rate_massfrac_H]
    initial_condition = -2.952985071156e-06
  []
  [injection_rate_massfrac_Cl]
    initial_condition = 0.04870664551708
  []
  [injection_rate_massfrac_SO4]
    initial_condition = 0.0060359986852517
  []
  [injection_rate_massfrac_HCO3]
    initial_condition = 5.0897287594019e-05
  []
  [injection_rate_massfrac_SiO2aq]
    initial_condition = 3.0246609868421e-05
  []
  [injection_rate_massfrac_Al]
    initial_condition = 3.268028901929e-08
  []
  [injection_rate_massfrac_Ca]
    initial_condition = 0.00082159428184586
  []
  [injection_rate_massfrac_Mg]
    initial_condition = 1.8546347062146e-05
  []
  [injection_rate_massfrac_Fe]
    initial_condition = 4.3291908204093e-05
  []
  [injection_rate_massfrac_K]
    initial_condition = 6.8434768308898e-05
  []
  [injection_rate_massfrac_Na]
    initial_condition = 0.033298053919671
  []
  [injection_rate_massfrac_Sr]
    initial_condition = 1.2771866652177e-05
  []
  [injection_rate_massfrac_F]
    initial_condition = 5.5648860174073e-06
  []
  [injection_rate_massfrac_BOH]
    initial_condition = 0.0003758574621917
  []
  [injection_rate_massfrac_Br]
    initial_condition = 9.0315286107068e-05
  []
  [injection_rate_massfrac_Ba]
    initial_condition = 1.5637460875161e-07
  []
  [injection_rate_massfrac_Li]
    initial_condition = 8.3017067912701e-05
  []
  [injection_rate_massfrac_NO3]
    initial_condition = 0.00010958455036169
  []
  [injection_rate_massfrac_O2aq]
    initial_condition = -7.0806852373351e-05
  []
  [injection_rate_massfrac_H2O]
    initial_condition = 0.91032275033842
  []
  [rate_H]
  []
  [rate_Cl]
  []
  [rate_SO4]
  []
  [rate_HCO3]
  []
  [rate_SiO2aq]
  []
  [rate_Al]
  []
  [rate_Ca]
  []
  [rate_Mg]
  []
  [rate_Fe]
  []
  [rate_K]
  []
  [rate_Na]
  []
  [rate_Sr]
  []
  [rate_F]
  []
  [rate_BOH]
  []
  [rate_Br]
  []
  [rate_Ba]
  []
  [rate_Li]
  []
  [rate_NO3]
  []
  [rate_O2aq]
  []
  [rate_H2O]
  []
[]

[MultiApps]
  [react]
    type = TransientMultiApp
    input_files = aquifer_geochemistry.i
    clone_master_mesh = true
    execute_on = 'timestep_end'
  []
[]
[Transfers]
  [changes_due_to_flow]
    type = MultiAppCopyTransfer
    direction = to_multiapp
    source_variable = 'rate_H rate_Cl rate_SO4 rate_HCO3 rate_SiO2aq rate_Al rate_Ca rate_Mg rate_Fe rate_K rate_Na rate_Sr rate_F rate_BOH rate_Br rate_Ba rate_Li rate_NO3 rate_O2aq rate_H2O temperature'
    variable = 'pf_rate_H pf_rate_Cl pf_rate_SO4 pf_rate_HCO3 pf_rate_SiO2aq pf_rate_Al pf_rate_Ca pf_rate_Mg pf_rate_Fe pf_rate_K pf_rate_Na pf_rate_Sr pf_rate_F pf_rate_BOH pf_rate_Br pf_rate_Ba pf_rate_Li pf_rate_NO3 pf_rate_O2aq pf_rate_H2O temperature'
    multi_app = react
  []
  [massfrac_from_geochem]
    type = MultiAppCopyTransfer
    direction = from_multiapp
    source_variable = 'massfrac_H massfrac_Cl massfrac_SO4 massfrac_HCO3 massfrac_SiO2aq massfrac_Al massfrac_Ca massfrac_Mg massfrac_Fe massfrac_K massfrac_Na massfrac_Sr massfrac_F massfrac_BOH massfrac_Br massfrac_Ba massfrac_Li massfrac_NO3 massfrac_O2aq '
    variable = 'f_H f_Cl f_SO4 f_HCO3 f_SiO2aq f_Al f_Ca f_Mg f_Fe f_K f_Na f_Sr f_F f_BOH f_Br f_Ba f_Li f_NO3 f_O2aq '
    multi_app = react
  []
[]

(test/tests/transfers/multiapp_postprocessor_to_scalar/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [u]
  []
[]

[Kernels]
  [diff]
    type = CoefDiffusion
    variable = u
    coef = 0.01
  []
  [td]
    type = TimeDerivative
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Postprocessors]
  [average]
    type = ElementAverageValue
    variable = u
  []
[]

[Executioner]
  type = Transient
  solve_type = 'PJFNK'
  num_steps = 5
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'

  nl_rel_tol = 1e-12
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [pp_sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0.5 0.5 0 0.7 0.7 0'
    execute_on = timestep_end
    input_files = sub.i
  []
[]

[Transfers]
  [pp_transfer]
    type = MultiAppPostprocessorToAuxScalarTransfer
    direction = to_multiapp
    multi_app = pp_sub
    from_postprocessor = average
    to_aux_scalar = from_master_app
  []
[]

(modules/functional_expansion_tools/examples/2D_interface_no_material/main.i)

# Derived from the example '2D_interface' with the following differences:
#
#   1) No materials are used
[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0.0
  xmax = 0.4
  nx = 6
  ymin = 0.0
  ymax = 10.0
  ny = 20
[]

[Variables]
  [./m]
  [../]
[]

[Kernels]
  [./diff_m]
    type = Diffusion
    variable = m
  [../]
  [./time_diff_m]
    type = TimeDerivative
    variable = m
  [../]
  [./source_m]
    type = BodyForce
    variable = m
    value = 100
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    value = 2
    variable = m
  [../]
[]

[BCs]
  [./interface_value]
    type = FXValueBC
    variable = m
    boundary = right
    function = FX_Basis_Value_Main
  [../]
  [./interface_flux]
    type = FXFluxBC
    boundary = right
    variable = m
    function = FX_Basis_Flux_Main
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '4'
    physical_bounds = '0.0 10'
    y = Legendre
  [../]
  [./FX_Basis_Flux_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '5'
    physical_bounds = '0.0 10'
    y = Legendre
  [../]
[]

[UserObjects]
  [./FX_Flux_UserObject_Main]
    type = FXBoundaryFluxUserObject
    function = FX_Basis_Flux_Main
    variable = m
    boundary = right
    diffusivity = 0.1
  [../]
[]

[Postprocessors]
  [./average_interface_value]
    type = SideAverageValue
    variable = m
    boundary = right
  [../]
  [./total_flux]
    type = SideDiffusiveFluxIntegral
    variable = m
    boundary = right
    diffusivity = 0.1
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 1.0
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = sub.i
    sub_cycling = true
  [../]
[]

[Transfers]
  [./FluxToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Flux_UserObject_Main
    multi_app_object_name = FX_Basis_Flux_Sub
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
  [./FluxToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Flux_Main
    multi_app_object_name = FX_Flux_UserObject_Sub
  [../]
[]

(test/tests/transfers/multiapp_nearest_node_transfer/fromsub_fixed_meshes_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./from_sub]
  [../]
  [./elemental_from_sub]
    order = CONSTANT
    family = MONOMIAL
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 4
  dt = 0.01
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0.1 0.45 0'
    input_files = fromsub_fixed_meshes_sub.i
  [../]
[]

[Transfers]
  # Note: it's not generally advised to use "fixed_meshes = true" with displaced
  # meshes.  We only do that for this test to make sure the test will fail if
  # "fixed_meshes" isn't working properly.
  [./from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u
    variable = from_sub
    fixed_meshes = true
    displaced_source_mesh = true
  [../]
  [./elemental_from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u
    variable = elemental_from_sub
    fixed_meshes = true
    displaced_source_mesh = true
  [../]
[]

(test/tests/multiapps/steffensen/transient_main.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 5
  ny = 5
  parallel_type = replicated
  uniform_refine = 1
[]

[Variables]
  [u]
  []
[]

[AuxVariables]
  [v]
  []
[]

[Kernels]
  [diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  []
  [time]
    type = TimeDerivative
    variable = u
  []
  [force_u]
    type = CoupledForce
    variable = u
    v = v
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Postprocessors]
  [coupling_its]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  []
  [unorm]
    type = ElementL2Norm
    variable = u
  []
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  nl_abs_tol = 1e-14

  fixed_point_algorithm = 'steffensen'
  fixed_point_max_its = 30
  transformed_variables = 'u'
[]

[Outputs]
  csv = true
  exodus = false
[]

[MultiApps]
  [sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = 'transient_sub.i'
    clone_master_mesh = true
    execute_on = 'timestep_begin'
  []
[]

[Transfers]
  [v_from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = v
    variable = v
    execute_on = 'timestep_begin'
  []
  [u_to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = u
    execute_on = 'timestep_begin'
  []
[]

(test/tests/multiapps/relaxation/picard_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./v]
    initial_condition = 1
  [../]
  [./inverse_v]
    initial_condition = 1
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
  [./force_u]
    type = CoupledForce
    variable = u
    v = inverse_v
  [../]
[]

[AuxKernels]
  [./invert_v]
    type = QuotientAux
    variable = inverse_v
    denominator = v
    numerator = 20.0
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./Neumann_right]
    type = NeumannBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Postprocessors]
  [picard_its]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 4
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_abs_tol = 1e-14
[]

[Outputs]
  exodus = true
  execute_on = 'INITIAL TIMESTEP_END'
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_begin
    positions = '0 0 0'
    input_files = picard_relaxed_sub.i
  [../]
[]

[Transfers]
  [./v_from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = v
    variable = v
  [../]
  [./u_to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = u
  [../]
[]

(test/tests/multiapps/move_and_reset/multilevel_sub.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.01

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '1 1 0'
    input_files = multilevel_sub_sub.i
    output_in_position = true
  [../]
[]

(test/tests/multiapps/restart_subapp_ic/master2.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0
  ymin = 0
  xmax = 1
  ymax = 1
  nx = 10
  ny = 10
[]

[Functions]
  [./v_fn]
    type = ParsedFunction
    value = t*x
  [../]
  [./ffn]
    type = ParsedFunction
    value = x
  [../]
[]

[AuxVariables]
  [./v]
  [../]
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
  [./ufn]
    type = BodyForce
    variable = u
    function = ffn
  [../]
[]

[BCs]
  [./all]
    type = FunctionDirichletBC
    variable = u
    boundary = 'left right top bottom'
    function = v_fn
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 5
  dt = 0.1
  solve_type = 'PJFNK'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub_app]
    app_type = MooseTestApp
    type = TransientMultiApp
    input_files = 'sub2.i'
    execute_on = timestep_end
    positions = '0 -1 0'
  [../]
[]

[Transfers]
  [./from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub_app
    source_variable = u
    variable = v
  [../]
[]

[Problem]
  restart_file_base = master_out_cp/0005
[]

(modules/functional_expansion_tools/examples/3D_volumetric_Cartesian/main.i)

# Basic example coupling a master and sub app in a 3D Cartesian volume.
#
# The master app provides field values to the sub app via Functional Expansions, which then performs
# its calculations. The sub app's solution field values are then transferred back to the master app
# and coupled into the solution of the master app solution.
#
# This example couples Functional Expansions via AuxVariable.
#
# Note: this problem is not light, and may take a few minutes to solve.
[Mesh]
  type = GeneratedMesh
  dim = 3

  xmin = 0.0
  xmax = 10.0
  nx = 15

  ymin = 1.0
  ymax = 11.0
  ny = 25

  zmin = 2.0
  zmax = 12.0
  nz = 35
[]

[Variables]
  [./m]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[AuxVariables]
  [./s_in]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff_m]
    type = HeatConduction
    variable = m
  [../]
  [./time_diff_m]
    type = HeatConductionTimeDerivative
    variable = m
  [../]
  [./s_in] # Add in the contribution from the SubApp
    type = CoupledForce
    variable = m
    v = s_in
  [../]
[]

[AuxKernels]
  [./reconstruct_s_in]
    type = FunctionSeriesToAux
    variable = s_in
    function = FX_Basis_Value_Main
  [../]
[]

[Materials]
  [./Unobtanium]
    type = GenericConstantMaterial
    prop_names =  'thermal_conductivity specific_heat density'
    prop_values = '1.0                  1.0           1.0' # W/(cm K), J/(g K), g/cm^3
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    variable = m
    value = 1
  [../]
[]

[BCs]
  [./surround]
    type = DirichletBC
    variable = m
    value = 1
    boundary = 'top bottom left right front back'
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '3   4   5'
    physical_bounds = '0.0  10.0    1.0 11.0    2.0 12.0'
    x = Legendre
    y = Legendre
    z = Legendre
  [../]
[]

[UserObjects]
  [./FX_Value_UserObject_Main]
    type = FXVolumeUserObject
    function = FX_Basis_Value_Main
    variable = m
  [../]
[]

[Postprocessors]
  [./average_value]
    type = ElementAverageValue
    variable = m
  [../]
  [./peak_value]
    type = ElementExtremeValue
    value_type = max
    variable = m
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = sub.i
  [../]
[]

[Transfers]
  [./ValueToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Value_UserObject_Main
    multi_app_object_name = FX_Basis_Value_Sub
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
[]

(test/tests/restart/restart_transient_from_steady/restart_trans_with_2subs.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  parallel_type = 'replicated'
[]

[Problem]
  restart_file_base = steady_with_2subs_out_cp/LATEST
  skip_additional_restart_data = true
[]

[AuxVariables]
  [Tf]
  []
[]

[Variables]
  [power_density]
  []
[]

[Functions]
  [pwr_func]
    type = ParsedFunction
    value = '1e3*x*(1-x)+5e2' # increase this function to drive transient
  []
[]

[Kernels]
  [timedt]
    type = TimeDerivative
    variable = power_density
  []

  [diff]
    type = Diffusion
    variable = power_density
  []

  [coupledforce]
    type = BodyForce
    variable = power_density
    function = pwr_func
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = power_density
    boundary = left
    value = 50
  []
  [right]
    type = DirichletBC
    variable = power_density
    boundary = right
    value = 1e3
  []
[]

[Postprocessors]
  [pwr_avg]
    type = ElementAverageValue
    block = '0'
    variable = power_density
    execute_on = 'initial timestep_end'
  []
  [temp_avg]
    type = ElementAverageValue
    variable = Tf
    block = '0'
    execute_on = 'initial timestep_end'
  []
  [temp_max]
    type = ElementExtremeValue
    value_type = max
    variable = Tf
    block = '0'
    execute_on = 'initial timestep_end'
  []
  [temp_min]
    type = ElementExtremeValue
    value_type = min
    variable = Tf
    block = '0'
    execute_on = 'initial timestep_end'
  []
[]

[Executioner]
  type = Transient
  start_time = 0
  end_time = 3
  dt = 1.0

  petsc_options_iname = '-pc_type -pc_hypre_type -ksp_gmres_restart '
  petsc_options_value = 'hypre boomeramg 100'

  nl_abs_tol = 1e-8
  nl_rel_tol = 1e-7

  fixed_point_rel_tol = 1e-7
  fixed_point_abs_tol = 1e-07
  fixed_point_max_its = 4

  line_search = none
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0   0 0
                 0.5 0 0'
    input_files  = restart_trans_with_sub_sub.i
    execute_on = 'timestep_end'
  [../]
[]

[Transfers]
  [p_to_sub]
    type = MultiAppProjectionTransfer
    direction = to_multiapp
    source_variable = power_density
    variable = power_density
    multi_app = sub
    execute_on = 'timestep_end'
  []
  [t_from_sub]
    type = MultiAppInterpolationTransfer
    direction = from_multiapp
    source_variable = temp
    variable = Tf
    multi_app = sub
    execute_on = 'timestep_end'
  []
[]

[Outputs]
  exodus = true
  csv = true
  perf_graph = true
[]

(test/tests/transfers/multiapp_postprocessor_transfer/from_one_sub_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./from_sub]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Postprocessors]
  [./sub_average]
    type = Receiver
  [../]
  [./sub_sum]
    type = Receiver
  [../]
  [./sub_maximum]
    type = Receiver
  [../]
  [./sub_minimum]
    type = Receiver
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    positions = '0.2 0.2 0'
    type = TransientMultiApp
    app_type = MooseTestApp
    input_files = 'sub0.i'
  [../]
[]

[Transfers]
  [./pp_transfer_ave]
    type = MultiAppPostprocessorTransfer
    reduction_type = average
    direction = from_multiapp
    multi_app = sub
    from_postprocessor = average
    to_postprocessor = sub_average
  [../]
  [./pp_transfer_sum]
    type = MultiAppPostprocessorTransfer
    reduction_type = sum
    direction = from_multiapp
    multi_app = sub
    from_postprocessor = average
    to_postprocessor = sub_sum
  [../]
  [./pp_transfer_min]
    type = MultiAppPostprocessorTransfer
    reduction_type = minimum
    direction = from_multiapp
    multi_app = sub
    from_postprocessor = average
    to_postprocessor = sub_minimum
  [../]
  [./pp_transfer_max]
    type = MultiAppPostprocessorTransfer
    reduction_type = maximum
    direction = from_multiapp
    multi_app = sub
    from_postprocessor = average
    to_postprocessor = sub_maximum
  [../]
[]

(test/tests/transfers/multiapp_nearest_node_transfer/to_multiple_boundaries_master.i)

# Master mesh and sub mesh are same with 4x4 quad8 elements.
# master mesh has top boundary fixed at u=2 and bottom fixed at u=-1
# sub mesh has top boundary fixed at v=2 and bottom fixed at v=1
# The u variable is transferred to the left and bottom boundaries of the sub,
# while the v variable is transferred to the right and top boundaries of the master.

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 4
  ny = 4
[]

[Variables]
  [u]
  []
[]

[AuxVariables]
  [from_sub]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
[]

[BCs]
  [top]
    type = DirichletBC
    variable = u
    boundary = top
    value = 2.0
  []
  [bottom]
    type = DirichletBC
    variable = u
    boundary = bottom
    value = -1.0
  []
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    input_files = to_multiple_boundaries_sub.i
    execute_on = timestep_end
  []
[]

[Transfers]
  [to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    target_boundary = 'left bottom'
    variable = from_master
  []
  [from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = v
    target_boundary = 'right top'
    variable = from_sub
  []
[]

(test/tests/transfers/multiapp_projection_transfer/tosub_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0
  xmax = 9
  ymin = 0
  ymax = 9
  nx = 9
  ny = 9
[]

[Variables]
  [u]
  []
[]

[AuxVariables]
  [x]
    order = CONSTANT
    family = MONOMIAL
  []
[]

[Functions]
  [x_func]
    type = ParsedFunction
    value = x
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
[]

[AuxKernels]
  [x_func_aux]
    type = FunctionAux
    variable = x
    function = x_func
    execute_on = initial
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'NEWTON'
[]

[Outputs]
  exodus = true
[]

[Debug]
#  show_actions = true
[]

[MultiApps]
  [sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '1 1 0 5 5 0'
    input_files = tosub_sub.i
  []
[]

[Transfers]
  [tosub]
    type = MultiAppProjectionTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = u_nodal
  []
  [elemental_tosub]
    type = MultiAppProjectionTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = u_elemental
  []
  [elemental_to_sub_elemental]
    type = MultiAppProjectionTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = x
    variable = x_elemental
  []
  [elemental_to_sub_nodal]
    type = MultiAppProjectionTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = x
    variable = x_nodal
  []
[]

(test/tests/multiapps/picard_multilevel/multilevel_dt_rejection/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./v]
  [../]
[]

[AuxKernels]
  [./set_v]
    type = FunctionAux
    variable = v
    function = 't'
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./coupled_force]
    type = CoupledForce
    variable = u
    v = v
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  solve_type = PJFNK
  num_steps = 2
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 1
  auto_advance = false
[]

[MultiApps]
  [./sub1]
    type = TransientMultiApp
    positions = '0 0 0'
    input_files = picard_sub.i
    execute_on = 'timestep_end'
  [../]
[]

[Transfers]
  [./u_to_v2]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub1
    source_variable = u
    variable = v2
  [../]
  [time_to_sub]
    type = MultiAppPostprocessorTransfer
    from_postprocessor = time
    to_postprocessor = master_time
    direction = to_multiapp
    multi_app = sub1
  []
  [dt_to_sub]
    type = MultiAppPostprocessorTransfer
    from_postprocessor = dt
    to_postprocessor = master_dt
    direction = to_multiapp
    multi_app = sub1
  []
[]

[Postprocessors]
  [time]
    type = TimePostprocessor
    execute_on = 'timestep_end'
  []
  [dt]
    type = TimestepSize
    execute_on = 'timestep_end'
  []
[]

(test/tests/outputs/perf_graph/multi_app/master_sub_cycle.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 5
  dt = 0.2

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  perf_graph = true
[]

[MultiApps]
  [./sub_app]
    positions = '0 0 0'
    type = TransientMultiApp
    input_files = 'sub_sub_cycle.i'
    app_type = MooseTestApp
    sub_cycling = true
  [../]
[]

(test/tests/multiapps/picard_postprocessor/transient_main.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 5
  ny = 5
  parallel_type = replicated
  uniform_refine = 1
[]

[Variables]
  [u]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
  [time]
    type = TimeDerivative
    variable = u
  []
  [source]
    type = BodyForce
    variable = u
    value = 1
  []
[]

[BCs]
  [left]
    type = PostprocessorDirichletBC
    variable = u
    boundary = left
    postprocessor = 'from_sub'
  []
[]

[Postprocessors]
  [coupling_its]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  []
  [from_sub]
    type = Receiver
    default = 0
  []
  [to_sub]
    type = SideAverageValue
    variable = u
    boundary = right
  []
  [average]
    type = ElementAverageValue
    variable = u
  []
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  nl_abs_tol = 1e-14

  # App coupling parameters
  fixed_point_max_its = 30
  relaxation_factor = 0.8
  transformed_postprocessors = 'from_sub'
[]

[Outputs]
  csv = true
  exodus = false
[]

[MultiApps]
  [sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = 'transient_sub.i'
    clone_master_mesh = true
    execute_on = 'timestep_begin'
  []
[]

[Transfers]
  [left_from_sub]
    type = MultiAppPostprocessorTransfer
    direction = from_multiapp
    multi_app = sub
    from_postprocessor = 'to_main'
    to_postprocessor = 'from_sub'
    reduction_type = 'average'
  []
  [right_to_sub]
    type = MultiAppPostprocessorTransfer
    direction = to_multiapp
    multi_app = sub
    from_postprocessor = 'to_sub'
    to_postprocessor = 'from_main'
  []
[]

(test/tests/userobjects/postprocessor_spatial_user_object/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 4
  ny = 4
[]

[Functions]
  [./ic_fn]
    type = ParsedFunction
    value = 'x * y'
  [../]
[]

[Variables]
  [./u]
    family = LAGRANGE
    order = FIRST
  [../]
[]

[ICs]
  [./u_ic]
    type = FunctionIC
    variable = u
    function = ic_fn
  [../]

  [./a_ic]
    type = ConstantIC
    variable = a
    value = 1
  [../]
[]

[AuxVariables]
  [./a]
  [../]
[]

[Kernels]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
  [./rhs]
    type = BodyForce
    variable = u
    function = 1
  [../]
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    input_files = 'sub.i'
    positions = '
      0.25 0.25 0
      0.75 0.75 0'
    execute_on = 'initial timestep_end'
  [../]
[]

[Transfers]
  [./master_to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = a
  [../]

  [./sub_to_master]
    type = MultiAppUserObjectTransfer
    direction = from_multiapp
    multi_app = sub
    user_object = fn_uo
    variable = a
  [../]
[]

[Executioner]
  type = Transient
  dt = 0.1
  num_steps = 10
[]

[Outputs]
  exodus = true
[]

(test/tests/multiapps/multilevel/time_dt_from_master_sub.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  xmax = 100
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
  [./console]
    type = Console
    output_file = true
  [../]
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0 0.5 0.5 0'
    input_files = time_dt_from_master_subsub.i
  [../]
[]

(tutorials/tutorial02_multiapps/step02_transfers/04_master_multiscale.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [u]
  []
[]

[AuxVariables]
  [vt]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
  [force]
    type = BodyForce
    variable = u
    value = 1.
  []
  [td]
    type = TimeDerivative
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Executioner]
  type = Transient
  end_time = 2
  dt = 0.2

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [micro]
    type = TransientMultiApp
    positions = '0.15 0.15 0  0.45 0.45 0  0.75 0.75 0'
    input_files = '04_sub_multiscale.i'
    cli_args = 'BCs/right/value=1 BCs/right/value=2 BCs/right/value=3'
    execute_on = timestep_end
    output_in_position = true
  []
[]

[Transfers]
  [push_u]
    type = MultiAppVariableValueSampleTransfer
    multi_app = micro
    direction = to_multiapp
    source_variable = u
    variable = ut
  []

  [pull_v]
    type = MultiAppPostprocessorInterpolationTransfer
    multi_app = micro
    direction = from_multiapp
    variable = vt
    postprocessor = average_v
  []
[]

(test/tests/multiapps/max_procs_per_app/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '0 0 0'
    input_files = sub.i
    max_procs_per_app = 1
  [../]
[]

(test/tests/multiapps/relaxation/sub_relaxed_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./v]
    initial_condition = 1
  [../]
  [./inverse_v]
    initial_condition = 1
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
  [./force_u]
    type = CoupledForce
    variable = u
    v = inverse_v
  [../]
[]

[AuxKernels]
  [./invert_v]
    type = QuotientAux
    variable = inverse_v
    denominator = v
    numerator = 20.0
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./Neumann_right]
    type = NeumannBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Postprocessors]
  [picard_its]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 4
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_abs_tol = 1e-14
[]

[Outputs]
  exodus = true
  execute_on = 'INITIAL TIMESTEP_END'
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_begin
    positions = '0 0 0'
    input_files = sub_relaxed_sub.i
    transformed_variables = v
    relaxation_factor = 0.94
  [../]
[]

[Transfers]
  [./v_from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = v
    variable = v
  [../]
  [./u_to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = u
  [../]
[]

(modules/functional_expansion_tools/test/tests/standard_use/interface_coupled.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0.0
  xmax = 0.4
  nx = 6
  ymin = 0.0
  ymax = 10.0
  ny = 20
[]

[Variables]
  [./m]
  [../]
[]

[Kernels]
  [./diff_m]
    type = Diffusion
    variable = m
  [../]
  [./time_diff_m]
    type = TimeDerivative
    variable = m
  [../]
  [./source_m]
    type = BodyForce
    variable = m
    value = 100
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    value = 2
    variable = m
  [../]
[]

[BCs]
  [./interface_value]
    type = FXValueBC
    variable = m
    boundary = right
    function = FX_Basis_Value_Main
  [../]
  [./interface_flux]
    type = FXFluxBC
    boundary = right
    variable = m
    function = FX_Basis_Flux_Main
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '4'
    physical_bounds = '0.0 10'
    y = Legendre
  [../]
  [./FX_Basis_Flux_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '5'
    physical_bounds = '0.0 10'
    y = Legendre
  [../]
[]

[UserObjects]
  [./FX_Flux_UserObject_Main]
    type = FXBoundaryFluxUserObject
    function = FX_Basis_Flux_Main
    variable = m
    boundary = right
    diffusivity = 0.1
  [../]
[]

[Postprocessors]
  [./average_interface_value]
    type = SideAverageValue
    variable = m
    boundary = right
  [../]
  [./total_flux]
    type = SideDiffusiveFluxIntegral
    variable = m
    boundary = right
    diffusivity = 0.1
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 4
  dt = 1.0
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = interface_sub.i
    sub_cycling = true
  [../]
[]

[Transfers]
  [./FluxToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Flux_UserObject_Main
    multi_app_object_name = FX_Basis_Flux_Sub
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
  [./FluxToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Flux_Main
    multi_app_object_name = FX_Flux_UserObject_Sub
  [../]
[]

(test/tests/multiapps/picard/picard_abs_tol_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./v]
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
  [./force_u]
    type = CoupledForce
    variable = u
    v = v
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 20
  dt = 0.1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  nl_abs_tol = 1e-12
  fixed_point_max_its = 10
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = picard_sub.i
  [../]
[]

[Transfers]
  [./v_from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = v
    variable = v
  [../]
  [./u_to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = u
  [../]
[]

(tutorials/tutorial02_multiapps/step03_coupling/01_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [u]
  []
[]

[AuxVariables]
  [vt]
  []
[]

[Kernels]
  [diff]
    type = MatDiffusion
    variable = u
  []
  [force]
    type = BodyForce
    variable = u
    value = 1.
  []
  [td]
    type = TimeDerivative
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Materials]
  [diff]
    type = ParsedMaterial
    f_name = D
    args = 'vt'
    function = 'vt'
  []
[]

[Executioner]
  type = Transient
  end_time = 2
  dt = 0.2

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [micro]
    type = TransientMultiApp
    positions = '0.15 0.15 0  0.45 0.45 0  0.75 0.75 0'
    input_files = '01_sub.i'
    execute_on = timestep_end
    output_in_position = true
  []
[]

[Transfers]
  [push_u]
    type = MultiAppVariableValueSampleTransfer
    multi_app = micro
    direction = to_multiapp
    source_variable = u
    variable = ut
  []

  [pull_v]
    type = MultiAppPostprocessorInterpolationTransfer
    multi_app = micro
    direction = from_multiapp
    variable = vt
    postprocessor = average_v
  []
[]

(test/tests/transfers/multiapp_userobject_transfer/3d_1d_master.i)

# This does a dummy diffusion solve in 3D space, then computes a layered average
# in the z direction. Those values are transferred into a sub-app that has 1D mesh
# in the z-direction (the mesh was displaced so that it is aligned in such a way).
# The sub-app also does a dummy diffusion solve and then computes layered average
# in the z-direction. Those value are transferred back to the master app.
#
# Physically the 1D sub-app is placed in the center of the 3D mesh and is oriented
# in the z-direction.  The bounding box of the sub-app is expanded such that it
# contains the 4 central elements of the 3D mesh (i.e. the values are transferred
# only into a part of master mesh)

[Mesh]
  type = GeneratedMesh
  dim = 3
  nx = 4
  ny = 4
  nz = 10
  # The MultiAppUserObjectTransfer object only works with ReplicatedMesh
  parallel_type = replicated
[]

[AuxVariables]
  [./from_sub_app_var]
    order = CONSTANT
    family = MONOMIAL
  [../]
[]

[UserObjects]
  [master_uo]
    type = LayeredAverage
    direction = z
    num_layers = 10
    variable = u
  []
[]

[Variables]
  [u]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
  [td]
    type = TimeDerivative
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = front
    value = -1
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = back
    value = 1
  []
[]

[Executioner]
  type = Transient
  num_steps = 2
  dt = 5

  solve_type = 'NEWTON'
  l_tol = 1e-8
  nl_rel_tol = 1e-10
[]

[Outputs]
  exodus = true
  execute_on = final
[]

[MultiApps]
  [sub_app]
    positions = '0.5 0.5 0.0'
    type = TransientMultiApp
    input_files = 3d_1d_sub.i
    app_type = MooseTestApp
    bounding_box_padding = '0.25 0.25 0'
    bounding_box_inflation = 0
    use_displaced_mesh = true
    execute_on = TIMESTEP_END
  []
[]

[Transfers]
  [layered_transfer_to_sub_app]
    type = MultiAppUserObjectTransfer
    direction = to_multiapp
    user_object = master_uo
    variable = sub_app_var
    multi_app = sub_app
    displaced_target_mesh = true
  []
  [layered_transfer_from_sub_app]
    type = MultiAppUserObjectTransfer
    direction = from_multiapp
    user_object = sub_app_uo
    variable = from_sub_app_var
    multi_app = sub_app
    displaced_source_mesh = true
  []
[]

(test/tests/transfers/multiapp_scalar_to_auxscalar_transfer/to_sub/master_wrong_order.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[AuxVariables]
  [./a]
    family = SCALAR
    order = FIFTH
  [../]
[]

[Variables]
  [./dummy]
  [../]
[]

[Kernels]
  [./dummy]
    type = Diffusion
    variable = dummy
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    positions = '0 0 0'
    input_files = 'sub_wrong_order.i'
  [../]
[]

[Transfers]
  [./to_sub]
    type = MultiAppScalarToAuxScalarTransfer
    multi_app = sub
    source_variable = 'a'
    to_aux_scalar = 'b'
    direction = to_multiapp
  [../]
[]

[Outputs]
    exodus = true
[]

(test/tests/transfers/multiapp_interpolation_transfer/fromrestrictedsub_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  # The MultiAppInterpolationTransfer object only works with ReplicatedMesh
  parallel_type = replicated
[]

[Variables]
  [u]
  []
[]

[AuxVariables]
  [elemental_from_sub]
    order = CONSTANT
    family = MONOMIAL
  []
  [nodal_from_sub]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0.05 0.5 0 0.55 0.5 0'
    input_files = fromrestrictedsub_sub.i
    output_in_position = true
  []
[]

[Transfers]
  [elemental_fromsub]
    type = MultiAppInterpolationTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = elemental
    variable = elemental_from_sub
  []
  [nodal_fromsub]
    type = MultiAppInterpolationTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = nodal
    variable = nodal_from_sub
  []
[]

(test/tests/multiapps/move_and_reset/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.01

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '1 1 0'
    input_files = sub.i
    reset_apps = 0
    reset_time = 0.05
    move_time = 0.05
    move_positions = '2 2 0'
    move_apps = 0
    output_in_position = true
  [../]
[]

(test/tests/multiapps/multilevel/dt_from_master_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 0.25

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
  [./out]
    type = Console
    output_file = true
  [../]
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0 0.5 0.5 0'
    input_files = dt_from_master_sub.i
  [../]
[]

(test/tests/multiapps/multilevel/time_dt_from_master_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  xmax = 100
[]

[Functions]
  [./dts]
    type = PiecewiseLinear
    x = '0     1'
    y = '0.25  1'
  [../]
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 4

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'

  dt = 0.25
  [./TimeStepper]
    type = FunctionDT
    function = dts
  [../]
[]

[Outputs]
  exodus = true
  [./out]
    type = Console
    output_file = true
  [../]
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0 0.5 0.5 0'
    input_files = time_dt_from_master_sub.i
  [../]
[]

(test/tests/transfers/multiapp_mesh_function_transfer/tosub.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [u]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub]
    positions = '.1 .1 0 0.6 0.6 0 0.6 0.1 0'
    type = TransientMultiApp
    app_type = MooseTestApp
    input_files = tosub_sub.i
    execute_on = timestep_end
  []
[]

[Transfers]
  [to_sub]
    source_variable = u
    direction = to_multiapp
    variable = transferred_u
    type = MultiAppMeshFunctionTransfer
    multi_app = sub
  []

  [elemental_to_sub]
    source_variable = u
    direction = to_multiapp
    variable = elemental_transferred_u
    type = MultiAppMeshFunctionTransfer
    multi_app = sub
  []
[]

(tutorials/tutorial02_multiapps/step01_multiapps/06_master_twoapps.i)

[Mesh]
  type = GeneratedMesh
  dim = 3
  nx = 40
  ny = 40
  nz = 40
[]

[Variables]
  [u]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
  [force]
    type = BodyForce
    variable = u
    value = 1.
  []
  [td]
    type = TimeDerivative
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 0
  []
[]

[Executioner]
  type = Transient
  end_time = 1
  dt = 1.

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
  perf_graph = true
[]

[MultiApps]
  [app1]
    type = TransientMultiApp
    positions   = '0 0 0  1 0 0  2 0 0'
    input_files = '06_sub_twoapps.i'
  []

  [app2]
    type = TransientMultiApp
    positions   = '0 0 0  1 0 0'
    input_files = '06_sub_twoapps.i'
  []
[]

(test/tests/transfers/multiapp_interpolation_transfer/fromsub_master.i)

###########################################################
# This is a test of the Transfer System. This test
# uses the Multiapp System to solve independent problems
# related geometrically. Solutions are then interpolated
# and transferred from a non-aligned domain.
#
# @Requirement F7.20
###########################################################


[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  displacements = 'disp_x disp_y'
  # The MultiAppInterpolationTransfer object only works with ReplicatedMesh
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./from_sub]
  [../]
  [./elemental_from_sub]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./radial_from_sub]
  [../]
  [./radial_elemental_from_sub]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./disp_x]
    initial_condition = 0.2
  [../]
  [./disp_y]
  [../]
  [./displaced_target_from_sub]
  [../]
  [./displaced_source_from_sub]
  [../]
  [./nodal_from_sub_elemental]
  [../]
  [./elemental_from_sub_elemental]
    order = CONSTANT
    family = MONOMIAL
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0 0.6 0 0'
    input_files = fromsub_sub.i
  [../]
[]

[Transfers]
  [./fromsub]
    type = MultiAppInterpolationTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u
    variable = from_sub
  [../]
  [./elemental_fromsub]
    type = MultiAppInterpolationTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u
    variable = elemental_from_sub
  [../]
  [./radial_fromsub]
    type = MultiAppInterpolationTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u
    variable = radial_from_sub
    interp_type = radial_basis
  [../]
  [./radial_elemental_fromsub]
    type = MultiAppInterpolationTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u
    variable = radial_elemental_from_sub
    interp_type = radial_basis
  [../]
  [./displaced_target_fromsub]
    type = MultiAppInterpolationTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u
    variable = displaced_target_from_sub
    displaced_target_mesh = true
  [../]
  [./displaced_source_fromsub]
    type = MultiAppInterpolationTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = u
    variable = displaced_source_from_sub
    displaced_source_mesh = true
  [../]
  [./elemental_from_sub_elemental]
    type = MultiAppInterpolationTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = elemental
    variable = elemental_from_sub_elemental
  [../]
  [./nodal_from_sub_elemental]
    type = MultiAppInterpolationTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = elemental
    variable = nodal_from_sub_elemental
  [../]
[]

(test/tests/multiapps/detect_steady_state/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 20
  ny = 20
  xmax = 10
  ymax = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 3
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = sub.i
    sub_cycling = true
    steady_state_tol = 1e-5
    detect_steady_state = true
  [../]
[]

(tutorials/tutorial02_multiapps/step01_multiapps/02_master_sublimit.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [u]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
  [force]
    type = BodyForce
    variable = u
    value = 1.
  []
  [td]
    type = TimeDerivative
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 0
  []
[]

[Executioner]
  type = Transient
  end_time = 2
  dt = 1.

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub_app]
    type = TransientMultiApp
    positions = '0 0 0'
    input_files = '02_sub_sublimit.i'
  []
[]

(test/tests/transfers/multiapp_copy_transfer/aux_to_aux/from_sub.i)

[Problem]
  solve = false
[]

[Mesh]
  type = GeneratedMesh
  dim = 2
[]

[MultiApps/sub]
  type = TransientMultiApp
  input_files = sub.i
[]

[Transfers/from_sub]
  type = MultiAppCopyTransfer
  direction = from_multiapp
  multi_app = sub
  source_variable = aux
  variable = x
[]

[AuxVariables/x]
[]

[Executioner]
  type = Transient
  num_steps = 1
[]

[Outputs]
  execute_on = 'FINAL'
  exodus = true
[]

(modules/functional_expansion_tools/test/tests/errors/multiapp_missing_sub_object.i)

[Mesh]
  type = GeneratedMesh
  dim = 1

  xmin = 0.0
  xmax = 10.0
  nx = 15
[]

[Variables]
  [./m]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[AuxVariables]
  [./s_in]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff_m]
    type = Diffusion
    variable = m
  [../]
  [./time_diff_m]
    type = TimeDerivative
    variable = m
  [../]
  [./s_in]
    type = CoupledForce
    variable = m
    v = s_in
  [../]
[]

[AuxKernels]
  [./reconstruct_s_in]
    type = FunctionSeriesToAux
    variable = s_in
    function = FX_Basis_Value_Main
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    variable = m
    value = 1
  [../]
[]

[BCs]
  [./surround]
    type = DirichletBC
    variable = m
    value = 1
    boundary = 'left right'
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '3'
    physical_bounds = '0.0  10.0'
    x = Legendre
  [../]
[]

[UserObjects]
  [./FX_Value_UserObject_Main]
    type = FXVolumeUserObject
    function = FX_Basis_Value_Main
    variable = m
  [../]
[]

[Postprocessors]
  [./average_value]
    type = ElementAverageValue
    variable = m
  [../]
  [./peak_value]
    type = ElementExtremeValue
    value_type = max
    variable = m
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = multiapp_sub.i
  [../]
[]

[Transfers]
  [./ValueToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Value_UserObject_Main
    multi_app_object_name = FX_Basis_Value
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
[]

(test/tests/transfers/multiapp_mesh_function_transfer/fromsub_target_displaced.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  displacements = 'x_disp y_disp'
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./transferred_u]
  [../]
  [./elemental_transferred_u]
    order = CONSTANT
    family = MONOMIAL
  [../]
  [./x_disp]
    initial_condition = -0.1
  [../]
  [./y_disp]
    initial_condition = -0.1
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    positions = '.099 .099 0 .599 .599 0 0.599 0.099 0'
    type = TransientMultiApp
    app_type = MooseTestApp
    input_files = fromsub_sub.i
  [../]
[]

[Transfers]
  [./from_sub]
    source_variable = sub_u
    direction = from_multiapp
    variable = transferred_u
    type = MultiAppMeshFunctionTransfer
    multi_app = sub
    displaced_target_mesh = true
  [../]
  [./elemental_from_sub]
    source_variable = sub_u
    direction = from_multiapp
    variable = elemental_transferred_u
    type = MultiAppMeshFunctionTransfer
    multi_app = sub
    displaced_target_mesh = true
  [../]
[]

(test/tests/transfers/multiapp_postprocessor_to_scalar/master2.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./from_sub_app]
    order = THIRD
    family = SCALAR
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.01
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Postprocessors]
  [./average]
    type = ElementAverageValue
    variable = u
  [../]
  [./point_value_0]
    type = ScalarVariable
    variable = from_sub_app
    component = 0
  [../]
  [./point_value_1]
    type = ScalarVariable
    variable = from_sub_app
    component = 1
  [../]
  [./point_value_2]
    type = ScalarVariable
    variable = from_sub_app
    component = 2
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'

  nl_rel_tol = 1e-12
[]

[Outputs]
  exodus = true
  hide = from_sub_app
[]

[MultiApps]
  [./pp_sub]
    app_type = MooseTestApp
    positions = '0.5 0.5 0
                 0.7 0.7 0
                 0.8 0.8 0'
    execute_on = timestep_end
    type = TransientMultiApp
    input_files = sub2.i
  [../]
[]

[Transfers]
  [./pp_transfer]
    type = MultiAppPostprocessorToAuxScalarTransfer
    direction = from_multiapp
    multi_app = pp_sub
    from_postprocessor = point_value
    to_aux_scalar = from_sub_app
  [../]
[]

(tutorials/tutorial02_multiapps/step01_multiapps/03_master_subcycle.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [u]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
  [force]
    type = BodyForce
    variable = u
    value = 1.
  []
  [td]
    type = TimeDerivative
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 0
  []
[]

[Executioner]
  type = Transient
  end_time = 2
  dt = 1.

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub_app]
    type = TransientMultiApp
    positions = '0 0 0'
    input_files = '03_sub_subcycle.i'
    sub_cycling = true
#    output_sub_cycles = true
  []
[]

(modules/functional_expansion_tools/examples/1D_volumetric_Cartesian/main.i)

# Basic example coupling a master and sub app in a 1D Cartesian volume.
#
# The master app provides field values to the sub app via Functional Expansions, which then performs
# its calculations. The sub app's solution field values are then transferred back to the master app
# and coupled into the solution of the master app solution.
#
# This example couples Functional Expansions via AuxVariable.
[Mesh]
  type = GeneratedMesh
  dim = 1

  xmin = 0.0
  xmax = 10.0
  nx = 15
[]

[Variables]
  [./m]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[AuxVariables]
  [./s_in]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff_m]
    type = HeatConduction
    variable = m
  [../]
  [./time_diff_m]
    type = HeatConductionTimeDerivative
    variable = m
  [../]
  [./s_in] # Add in the contribution from the SubApp
    type = CoupledForce
    variable = m
    v = s_in
  [../]
[]

[AuxKernels]
  [./reconstruct_s_in]
    type = FunctionSeriesToAux
    variable = s_in
    function = FX_Basis_Value_Main
  [../]
[]

[Materials]
  [./Unobtanium]
    type = GenericConstantMaterial
    prop_names =  'thermal_conductivity specific_heat density'
    prop_values = '1.0                  1.0           1.0' # W/(cm K), J/(g K), g/cm^3
  [../]
[]

[ICs]
  [./start_m]
    type = ConstantIC
    variable = m
    value = 1
  [../]
[]

[BCs]
  [./surround]
    type = DirichletBC
    variable = m
    value = 1
    boundary = 'left right'
  [../]
[]

[Functions]
  [./FX_Basis_Value_Main]
    type = FunctionSeries
    series_type = Cartesian
    orders = '3'
    physical_bounds = '0.0  10.0'
    x = Legendre
  [../]
[]

[UserObjects]
  [./FX_Value_UserObject_Main]
    type = FXVolumeUserObject
    function = FX_Basis_Value_Main
    variable = m
  [../]
[]

[Postprocessors]
  [./average_value]
    type = ElementAverageValue
    variable = m
  [../]
  [./peak_value]
    type = ElementExtremeValue
    value_type = max
    variable = m
  [../]
  [./picard_iterations]
    type = NumFixedPointIterations
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.5
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_rel_tol = 1e-8
  nl_abs_tol = 1e-9
  fixed_point_rel_tol = 1e-8
  fixed_point_abs_tol = 1e-9
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./FXTransferApp]
    type = TransientMultiApp
    input_files = sub.i
  [../]
[]

[Transfers]
  [./ValueToSub]
    type = MultiAppFXTransfer
    direction = to_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Value_UserObject_Main
    multi_app_object_name = FX_Basis_Value_Sub
  [../]
  [./ValueToMe]
    type = MultiAppFXTransfer
    direction = from_multiapp
    multi_app = FXTransferApp
    this_app_object_name = FX_Basis_Value_Main
    multi_app_object_name = FX_Value_UserObject_Sub
  [../]
[]

(test/tests/transfers/multiapp_copy_transfer/aux_to_aux/to_sub.i)

[Problem]
  solve = false
[]

[Mesh]
  type = GeneratedMesh
  dim = 2
[]

[MultiApps/sub]
  type = TransientMultiApp
  input_files = sub.i
[]

[Transfers/from_sub]
  type = MultiAppCopyTransfer
  direction = to_multiapp
  multi_app = sub
  source_variable = x
  variable = aux
[]

[AuxVariables/x]
  initial_condition = 1949
[]

[Executioner]
  type = Transient
  num_steps = 1
[]

[Outputs]
  execute_on = 'FINAL'
  exodus = true
[]

(test/tests/restart/restart_transient_from_transient/pseudo_trans_with_2subs.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  parallel_type = 'replicated'
[]

[AuxVariables]
  [Tf]
  []
[]

[Variables]
  [power_density]
  []
[]

[Functions]
  [pwr_func]
    type = ParsedFunction
    value = '1e3*x*(1-x)+5e2'
  []
[]

[Kernels]
  [timedt]
    type = TimeDerivative
    variable = power_density
  []
  [diff]
    type = Diffusion
    variable = power_density
  []
  [coupledforce]
    type = BodyForce
    variable = power_density
    function = pwr_func
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = power_density
    boundary = left
    value = 50
  []
  [right]
    type = DirichletBC
    variable = power_density
    boundary = right
    value = 1e3
  []
[]

[Postprocessors]
  [pwr_avg]
    type = ElementAverageValue
    variable = power_density
    execute_on = 'initial timestep_end'
  []
  [temp_avg]
    type = ElementAverageValue
    variable = Tf
    execute_on = 'initial timestep_end'
  []
  [temp_max]
    type = ElementExtremeValue
    value_type = max
    variable = Tf
    execute_on = 'initial timestep_end'
  []
  [temp_min]
    type = ElementExtremeValue
    value_type = min
    variable = Tf
    execute_on = 'initial timestep_end'
  []
[]

[Executioner]
  type = Transient
  petsc_options_iname = '-pc_type -pc_hypre_type -ksp_gmres_restart '
  petsc_options_value = 'hypre boomeramg 100'

  nl_abs_tol = 1e-8
  nl_rel_tol = 1e-12

  end_time = 20
  dt = 2.0
[]

[MultiApps]
  [sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0   0 0
                 0.5 0 0'
    input_files  = pseudo_trans_with_2subs_sub.i
    execute_on = 'timestep_end'
  []
[]

[Transfers]
  [p_to_sub]
    type = MultiAppProjectionTransfer
    direction = to_multiapp
    source_variable = power_density
    variable = power_density
    multi_app = sub
    execute_on = 'timestep_end'
  []
  [t_from_sub]
    type = MultiAppInterpolationTransfer
    direction = from_multiapp
    source_variable = temp
    variable = Tf
    multi_app = sub
    execute_on = 'timestep_end'
  []
[]

[Outputs]
  exodus = true
  csv = true
  perf_graph = true
  checkpoint = true
  execute_on = 'INITIAL TIMESTEP_END FINAL'
[]

(test/tests/multiapps/secant_postprocessor/transient_main.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 5
  ny = 5
  parallel_type = replicated
  uniform_refine = 1
[]

[Variables]
  [u]
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
  [time]
    type = TimeDerivative
    variable = u
  []
  [source]
    type = BodyForce
    variable = u
    value = 1
  []
[]

[BCs]
  [left]
    type = PostprocessorDirichletBC
    variable = u
    boundary = left
    postprocessor = 'from_sub'
  []
[]

[Postprocessors]
  [coupling_its]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  []
  [from_sub]
    type = Receiver
    default = 0
  []
  [to_sub]
    type = SideAverageValue
    variable = u
    boundary = right
  []
  [average]
    type = ElementAverageValue
    variable = u
  []
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  nl_abs_tol = 1e-14

  # App coupling parameters
  fixed_point_algorithm = 'secant'
  fixed_point_max_its = 30
  transformed_postprocessors = 'from_sub'
[]

[Outputs]
  csv = true
  exodus = false
[]

[MultiApps]
  [sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = 'transient_sub.i'
    clone_master_mesh = true
    execute_on = 'timestep_begin'
  []
[]

[Transfers]
  [left_from_sub]
    type = MultiAppPostprocessorTransfer
    direction = from_multiapp
    multi_app = sub
    from_postprocessor = 'to_main'
    to_postprocessor = 'from_sub'
    reduction_type = 'average'
  []
  [right_to_sub]
    type = MultiAppPostprocessorTransfer
    direction = to_multiapp
    multi_app = sub
    from_postprocessor = 'to_sub'
    to_postprocessor = 'from_main'
  []
[]

(modules/porous_flow/examples/multiapp_fracture_flow/fracture_diffusion/matrix_app_dirac.i)

# A fracture, which is a 1D line of elements, is embedded in a matrix, which is a 2D surface of elements.
# The meshes conform: all fracture nodes are also matrix nodes (the fracture elements are sides of matrix elements).
#
# The heat equation governs temperature in the fracture and matrix system, and heat energy is transferred between the two using a MultiApp approach
[Mesh]
  [generate]
    type = GeneratedMeshGenerator
    dim = 2
    nx = 20
    xmin = 0
    xmax = 10.0
    ny = 20 # anything less than this produces over/under-shoots
    ymin = -2
    ymax = 2
  []
[]

[Variables]
  [matrix_T]
  []
[]

[Kernels]
  [dot]
    type = TimeDerivative
    variable = matrix_T
  []
  [matrix_diffusion]
    type = AnisotropicDiffusion
    variable = matrix_T
    tensor_coeff = '1E-3 0 0 0 1E-3 0 0 0 1E-3'
  []
[]

[DiracKernels]
  [heat_from_fracture]
    type = ReporterPointSource
    variable = matrix_T
    value_name = heat_transfer_rate/transferred_joules_per_s
    x_coord_name = heat_transfer_rate/x
    y_coord_name = heat_transfer_rate/y
    z_coord_name = heat_transfer_rate/z
  []
[]

[VectorPostprocessors]
  [heat_transfer_rate]
    type = ConstantVectorPostprocessor
    vector_names = 'transferred_joules_per_s x y z'
    value = '0; 0; 0; 0'
    outputs = none
  []
[]

[Preconditioning]
  [entire_jacobian]
    type = SMP
    full = true
  []
[]

[Executioner]
  type = Transient
  solve_type = NEWTON
  dt = 100
  end_time = 100
  nl_rel_tol = 1e-8
  petsc_options_iname = '-pc_type  -pc_factor_mat_solver_package'
  petsc_options_value = 'lu        superlu_dist'
[]


[Outputs]
  print_linear_residuals = false
  exodus = false
  csv=true
[]

[MultiApps]
  [fracture_app]
    type = TransientMultiApp
    input_files = fracture_app_dirac.i
    execute_on = TIMESTEP_BEGIN
  []
[]

[Transfers]
  [T_to_fracture]
    type = MultiAppInterpolationTransfer
    direction = to_multiapp
    multi_app = fracture_app
    source_variable = matrix_T
    variable = transferred_matrix_T
  []
  [heat_from_fracture]
    type = MultiAppReporterTransfer
    direction = from_multiapp
    multi_app = fracture_app
    from_reporters = 'heat_transfer_rate/joules_per_s heat_transfer_rate/x heat_transfer_rate/y heat_transfer_rate/z'
    to_reporters = 'heat_transfer_rate/transferred_joules_per_s heat_transfer_rate/x heat_transfer_rate/y heat_transfer_rate/z'
  []
[]

(modules/combined/test/tests/restart-transient-from-ss-with-stateful/master_tr.i)

[Problem]
  restart_file_base = master_ss_checkpoint_cp/LATEST
  force_restart = true
  skip_additional_restart_data = true
[]

[Mesh]
  file = master_ss_checkpoint_cp/LATEST
[]

[Variables]
  [./temp]
    # no initial condition for restart.
  [../]
[]

[AuxVariables]
  [./power]
    order = FIRST
    family = L2_LAGRANGE
    initial_condition = 350
  [../]
[]

[Kernels]
  [./heat]
    type = HeatConduction
    variable = temp
  [../]
  [./heat_ie]
    type = HeatConductionTimeDerivative
    variable = temp
  [../]
  [./heat_source_fuel]
    type = CoupledForce
    variable = temp
    v = 'power'
  [../]
[]

[BCs]
  [./all]
    type = DirichletBC
    variable = temp
    boundary = 'bottom top left right'
    value = 300
  [../]
[]

[Materials]
  [./heat_material]
    type = HeatConductionMaterial
    temp = temp
    specific_heat = 1000
    thermal_conductivity = 500
  [../]
  [./density]
    type = Density
    density = 2000
  [../]
[]

[Postprocessors]
  [./avg_temp]
    type = ElementAverageValue
    variable = temp
    execute_on = 'timestep_end'
  [../]
  [./avg_power]
    type = ElementAverageValue
    variable = power
    execute_on = 'timestep_end'
  [../]
[]

[Executioner]
  type = Transient
  petsc_options_iname = '-pc_type -pc_hypre_type -ksp_gmres_restart'
  petsc_options_value = 'hypre boomeramg 300'
  line_search = 'none'

  l_tol = 1e-02
  nl_rel_tol = 5e-05
  nl_abs_tol = 5e-05

  l_max_its = 50
  nl_max_its = 25

  start_time = 0
  end_time = 40
  dt = 10
[]

[Outputs]
  print_linear_residuals = false
  perf_graph = true
  color = true
  exodus = true
[]

[MultiApps]
  [./bison]
    type = TransientMultiApp
    positions = '0 0 0'
    input_files = 'sub_tr.i'
    execute_on = 'timestep_end'
  [../]
[]

[Transfers]
  [./to_bison_mechanics]
    type = MultiAppProjectionTransfer
    direction = to_multiapp
    multi_app = bison
    variable = temp
    source_variable = temp
    execute_on = 'timestep_end'
  [../]
[]

(test/tests/transfers/multiapp_postprocessor_to_scalar/master2_wrong_positions.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./from_sub_app]
    order = THIRD
    family = SCALAR
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.01
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Postprocessors]
  [./average]
    type = ElementAverageValue
    variable = u
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 5

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./pp_sub]
    app_type = MooseTestApp
    positions = '0.5 0.5 0'
    execute_on = timestep_end
    type = TransientMultiApp
    input_files = sub2.i
  [../]
[]

[Transfers]
  [./pp_transfer]
    type = MultiAppPostprocessorToAuxScalarTransfer
    direction = from_multiapp
    multi_app = pp_sub
    from_postprocessor = point_value
    to_aux_scalar = from_sub_app
  [../]
[]

(test/tests/multiapps/cliargs_from_file/cliargs_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 1 # This will be constrained by the multiapp

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub_app]
    positions_file = positions.txt
    cli_args_files = cliargs.txt
    type = TransientMultiApp
    input_files = 'cliargs_sub.i'
    app_type = MooseTestApp
  [../]
[]

(test/tests/transfers/multiapp_scalar_to_auxscalar_transfer/from_sub/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[AuxVariables]
  [a]
    family = SCALAR
    order = SIXTH
  []
[]

[Variables]
  [dummy]
  []
[]

[Kernels]
  [dummy]
    type = Diffusion
    variable = dummy
  []
[]

[Executioner]
  type = Transient
  num_steps = 1
[]

[MultiApps]
  [sub]
    type = TransientMultiApp
    positions = '0 0 0'
    input_files = 'sub.i'
  []
[]

[Transfers]
  [from_sub]
    type = MultiAppScalarToAuxScalarTransfer
    multi_app = sub
    source_variable = 'b'
    to_aux_scalar = 'a'
    direction = from_multiapp
  []
[]

[Outputs]
    exodus = true
[]

(test/tests/transfers/multiapp_mesh_function_transfer/exec_on_mismatch.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [u]
  []
[]

[AuxVariables]
  [transferred_u]
  []
  [elemental_transferred_u]
    order = CONSTANT
    family = MONOMIAL
  []
[]

[Kernels]
  [diff]
    type = Diffusion
    variable = u
  []
[]

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  []
[]

[Executioner]
  type = Transient
  num_steps = 1
  dt = 1

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub]
    positions = '.099 .099 0 .599 .599 0 0.599 0.099 0'
    type = TransientMultiApp
    app_type = MooseTestApp
    input_files = fromsub_sub.i
    execute_on = 'initial timestep_begin'
  []
[]

[Transfers]
  [from_sub]
    source_variable = sub_u
    direction = from_multiapp
    variable = transferred_u
    type = MultiAppMeshFunctionTransfer
    multi_app = sub
    execute_on = 'initial timestep_end'
  []
  [elemental_from_sub]
    source_variable = sub_u
    direction = from_multiapp
    variable = elemental_transferred_u
    type = MultiAppMeshFunctionTransfer
    multi_app = sub
  []
[]

(test/tests/multiapps/picard_multilevel/fullsolve_multilevel/sub_level1.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0
  xmax = 1
  ymin = 0
  ymax = 1
  nx = 10
  ny = 10
[]

[Variables]
  [v]
  []
[]

[AuxVariables]
  [u]
  []
  [w]
  []
[]

[Kernels]
  [time_derivative]
    type = TimeDerivative
    variable = v
  []
  [diffusion]
    type = Diffusion
    variable = v
  []
  [source]
    type = CoupledForce
    variable = v
    v = u
  []
[]

[BCs]
  [dirichlet0]
    type = DirichletBC
    variable = v
    boundary = '0'
    value = 0
  []
  [dirichlet]
    type = DirichletBC
    variable = v
    boundary = '2'
    value = 100
  []
[]

[Postprocessors]
  [avg_u]
    type = ElementAverageValue
    variable = u
    execute_on = 'initial linear'
  []
  [avg_v]
    type = ElementAverageValue
    variable = v
    execute_on = 'initial linear'
  []
  [avg_w]
    type = ElementAverageValue
    variable = w
    execute_on = 'initial linear'
  []
[]

[Executioner]
  type = Transient

  petsc_options_iname = '-pc_type -pc_hypre_type -ksp_gmres_restart '
  petsc_options_value = 'hypre boomeramg 100'

  end_time = 0.1
  dt = 0.02
[]


[MultiApps]
  [level2-]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = sub_level2.i
    execute_on = 'timestep_end'
    # sub_cycling = true
  []
[]

[Transfers]
  [v_to_sub]
    type = MultiAppMeshFunctionTransfer
    direction = to_multiapp
    source_variable = v
    variable = v
    multi_app = level2-
    execute_on = 'timestep_end'
  []
  [w_from_sub]
    type = MultiAppMeshFunctionTransfer
    direction = from_multiapp
    source_variable = w
    variable = w
    multi_app = level2-
    execute_on = 'timestep_end'
  []
[]

[Outputs]
  exodus = true
  csv = true
  perf_graph = true
  # print_linear_residuals = false
[]

(test/tests/multiapps/move_and_reset/multilevel_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
[]

[Variables]
  [./u]
  [../]
[]

[Kernels]
  [./diff]
    type = Diffusion
    variable = u
  [../]
  [./td]
    type = TimeDerivative
    variable = u
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 10
  dt = 0.01

  solve_type = 'PJFNK'

  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    execute_on = timestep_end
    positions = '1 1 0'
    input_files = multilevel_sub.i
    output_in_position = true
    reset_apps = 0
    reset_time = 0.05
    move_time = 0.05
    move_positions = '2 2 0'
    move_apps = 0
  [../]
[]

(test/tests/multiapps/picard_catch_up/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 2
  ny = 2
  parallel_type = replicated
[]

[Variables]
  [./u]
  [../]
[]

[AuxVariables]
  [./v]
  [../]
[]

[Kernels]
  [./diff]
    type = CoefDiffusion
    variable = u
    coef = 0.1
  [../]
  [./time]
    type = TimeDerivative
    variable = u
  [../]
  [./force_u]
    type = CoupledForce
    variable = u
    v = 'v'
  [../]
[]

[BCs]
  [./left]
    type = DirichletBC
    variable = u
    preset = false
    boundary = 'left'
    value = 0
  [../]
  [./right]
    type = DirichletBC
    variable = u
    preset = false
    boundary = 'right'
    value = 1
  [../]
[]

[Postprocessors]
  [picard_its]
    type = NumFixedPointIterations
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = Transient
  num_steps = 2
  dt = 0.1
  solve_type = PJFNK
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  nl_abs_tol = 1e-14
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = TransientMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = 'sub.i'
    max_catch_up_steps = 100
    max_failures = 100
    catch_up = true
  [../]
[]

[Transfers]
  [./v_from_sub]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = v
    variable = v
  [../]
  [./u_to_sub]
    type = MultiAppNearestNodeTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = u
    variable = u
  [../]
[]

(modules/stochastic_tools/include/multiapps/SamplerTransientMultiApp.h)

// This file is part of the MOOSE framework
// https://www.mooseframework.org
//
// All rights reserved, see COPYRIGHT for full restrictions
// https://github.com/idaholab/moose/blob/master/COPYRIGHT
//
// Licensed under LGPL 2.1, please see LICENSE for details
// https://www.gnu.org/licenses/lgpl-2.1.html

#pragma once

// MOOSE includes
#include "TransientMultiApp.h"
#include "SamplerInterface.h"

#include "StochasticToolsTypes.h"

class Sampler;
class StochasticToolsTransfer;

class SamplerTransientMultiApp : public TransientMultiApp, public SamplerInterface
{
public:
  static InputParameters validParams();

  SamplerTransientMultiApp(const InputParameters & parameters);

  /**
   * Override solveStep to allow for batch execution.
   */
  virtual bool solveStep(Real dt, Real target_time, bool auto_advance = true) override;

  /**
   * Override to initialize batch backups.
   */
  virtual void initialSetup() override;

protected:
  /// Sampler to utilize for creating MultiApps
  Sampler & _sampler;

  /// The Sup-application solve mode
  const StochasticTools::MultiAppMode _mode;

  /// Counter for extracting command line arguments in batch mode
  dof_id_type _local_batch_app_index;

  /// Override to allow to get correct cli_args
  virtual std::string getCommandLineArgsParamHelper(unsigned int local_app) override;

private:
  /**
   * Helper method for running in mode='batch'
   * */
  bool solveStepBatch(Real dt, Real target_time, bool auto_advance = true);

  /**
   * Checks whether the MultiApp partitioning is consistent with the sampler
   */
  void checkRankConfig();

  /**
   * Helper function for updating _row_data and _local_row_index.
   * This allows multiple calls to the same row index
   */
  void updateRowData(dof_id_type local_index);

  /**
   * Helper for getting StochasticToolsTransfer objects.
   *
   * This is a copy from SamplerFullSolveMultiapp, but the alternative is to create an intermediate
   * base. But, given the inheritance difference between these object that gets rather complex, so
   * a few lines of copied code is better for now.
   */
  std::vector<std::shared_ptr<StochasticToolsTransfer>>
  getActiveStochasticToolsTransfers(Transfer::DIRECTION direction);

  /// Store the number of rows initialized, if this changes error because it doesn't make sense
  const dof_id_type _number_of_sampler_rows;
  /// Storage for batch-restore mode; the outer vector if for the local stochastic data and the
  /// inner vector is for the number of sub-apps. The later is 1 for this object, but it is included
  /// in case that changes in the future or in child classes
  std::vector<std::vector<std::shared_ptr<Backup>>> _batch_backup;

  /// Current row of data updated by updateRowData. Used by transfers and setting command line args
  std::vector<Real> _row_data;
  /// Current local index representing _row_data
  dof_id_type _local_row_index = std::numeric_limits<dof_id_type>::max();
};

(framework/include/multiapps/CentroidMultiApp.h)

// This file is part of the MOOSE framework
// https://www.mooseframework.org
//
// All rights reserved, see COPYRIGHT for full restrictions
// https://github.com/idaholab/moose/blob/master/COPYRIGHT
//
// Licensed under LGPL 2.1, please see LICENSE for details
// https://www.gnu.org/licenses/lgpl-2.1.html

#pragma once

#include "TransientMultiApp.h"
#include "BlockRestrictable.h"

class CentroidMultiApp;

template <>
InputParameters validParams<CentroidMultiApp>();

/**
 * Automatically generates Sub-App positions from centroids of elements in the master mesh.
 */
class CentroidMultiApp : public TransientMultiApp, public BlockRestrictable
{
public:
  static InputParameters validParams();

  CentroidMultiApp(const InputParameters & parameters);

protected:
  /**
   * fill in _positions with the positions of the sub-aps
   */
  virtual void fillPositions() override;
};

Overview
Time state of TransientMultiApps
Handing sub - application solve failures
Example Input File Syntax
Input Parameters
Input Files
Child Objects

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