FullSolveMultiApp

Performs a complete simulation during each execution.

Overview

The FullSolveMultiApp object is designed to perform a complete simulation every time it executes, thus it can be used for creating simulations that have portions that are on drastically different time scales.

Example Input File Syntax

The following code snippet demonstrates how to create a FullSolveMultiApp object.

[MultiApps]
  [full_solve]
    type = FullSolveMultiApp
    # not setting app_type to use the same app type of master, i.e. MooseTestApp
    execute_on = initial
    positions = '0 0 0'
    input_files = sub.i
  []
[]

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.
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.
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.
ignore_solve_not_convergeFalseTrue to continue main app even if a sub app's solve does not converge.
Default:False
C++ Type:bool
Options:
Description:True to continue main app even if a sub app's solve does not converge.
keep_full_output_historyFalseWhether or not to keep the full output history when this multiapp has multiple entries
Default:False
C++ Type:bool
Options:
Description:Whether or not to keep the full output history when this multiapp has multiple entries
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_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.
no_backup_and_restoreFalseTrue to turn off backup/restore for this multiapp. This is useful when doing steady-state Picard iterations where we want to use the solution of previous Picard iteration as the initial guess of the current Picard iteration
Default:False
C++ Type:bool
Options:
Description:True to turn off backup/restore for this multiapp. This is useful when doing steady-state Picard iterations where we want to use the solution of previous Picard iteration as the initial guess of the current Picard iteration
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
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
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.
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.
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/stochastic_tools/test/tests/multiapps/commandline_control/master_wrong_multiapp_type.i)
(test/tests/controls/restrict_exec_flag/exec_flag_error.i)
(test/tests/multiapps/command_line/master.i)
(test/tests/transfers/multiapp_copy_transfer/second_lagrange_from_sub/master.i)
(test/tests/restart/restart_subapp_not_master/two_step_solve_master.i)
(test/tests/misc/check_error/multi_master.i)
(test/tests/transfers/multiapp_copy_transfer/array_variable_transfer/master.i)
(modules/level_set/test/tests/transfers/copy_solution/master.i)
(test/tests/transfers/multiapp_copy_transfer/errors/master.i)
(test/tests/multiapps/secant/steady_main.i)
(test/tests/multiapps/secant_postprocessor/steady_main.i)
(test/tests/transfers/multiapp_copy_transfer/third_monomial_to_sub/master.i)
(test/tests/outputs/perf_graph/multi_app/master_full.i)
(test/tests/transfers/multiapp_copy_transfer/tagged_solution/main.i)
(test/tests/transfers/multiapp_conservative_transfer/master_power_density.i)
(test/tests/multiapps/initial_failure/master.i)
(test/tests/transfers/multiapp_high_order_variable_transfer/master_L2_Lagrange_conservative.i)
(test/tests/multiapps/steffensen/steady_main.i)
(test/tests/transfers/multiapp_copy_transfer/constant_monomial_to_sub/master.i)
(test/tests/multiapps/picard/pseudo_transient_picard_master.i)
(test/tests/multiapps/picard/steady_picard_master.i)
(test/tests/transfers/multiapp_conservative_transfer/primary_negative_adjuster.i)
(test/tests/restart/restart_transient_from_steady/steady_with_2subs.i)
(test/tests/multiapps/picard/steady_custom_picard_master.i)
(test/tests/multiapps/command_line/master_common.i)
(test/tests/multiapps/picard_multilevel/fullsolve_multilevel/master.i)
(test/tests/transfers/multiapp_copy_transfer/linear_lagrange_from_sub/master.i)
(test/tests/multiapps/picard_multilevel/2level_picard/mutilevel_app.i)
(test/tests/transfers/multiapp_projection_transfer/high_order_master.i)
(test/tests/problems/eigen_problem/eigensolvers/ne_coupled_picard.i)
(test/tests/transfers/multiapp_copy_transfer/linear_lagrange_to_sub/master.i)
(test/tests/transfers/multiapp_conservative_transfer/primary_skipped_adjuster.i)
(test/tests/multiapps/picard/picard_custom_postprocessor.i)
(test/tests/multiapps/picard_postprocessor/steady_main.i)
(test/tests/transfers/multiapp_copy_transfer/multivariable_copy/master.i)
(test/tests/transfers/multiapp_copy_transfer/second_lagrange_to_sub/master.i)
(modules/combined/test/tests/restart-transient-from-ss-with-stateful/master_ss.i)
(test/tests/multiapps/initial_transfer/master.i)
(test/tests/transfers/multiapp_copy_transfer/third_monomial_from_sub/master.i)
(test/tests/multiapps/full_solve_multiapp_reset/master.i)
(test/tests/multiapps/command_line/master_wrong_size.i)
(test/tests/vectorpostprocessors/csv_reader/transfer/master.i)
(test/tests/transfers/multiapp_high_order_variable_transfer/master_L2_Lagrange.i)
(test/tests/transfers/multiapp_high_order_variable_transfer/master_L2_Lagrange_userobject.i)
(test/tests/problems/eigen_problem/eigensolvers/ne_coupled_picard_subT.i)
(test/tests/transfers/multiapp_conservative_transfer/master_nearest_point.i)
(test/tests/transfers/multiapp_transfer_transformation/transfer_transformation.i)
(test/tests/transfers/from_full_solve/master.i)
(test/tests/transfers/multiapp_nearest_node_transfer/target_boundary_master.i)
(modules/stochastic_tools/test/tests/multiapps/batch_commandline_control/master_wrong_size.i)
(test/tests/transfers/multiapp_conservative_transfer/master_conservative_transfer.i)
(modules/stochastic_tools/test/tests/multiapps/batch_commandline_control/master_wrong_num_params.i)
(test/tests/multiapps/full_solve_multiapp/master_eigen.i)
(test/tests/multiapps/full_solve_multiapp/master.i)
(test/tests/multiapps/steffensen_postprocessor/steady_main.i)
(test/tests/transfers/multiapp_nearest_node_transfer/source_boundary_master.i)
(test/tests/transfers/multiapp_copy_transfer/constant_monomial_from_sub/master.i)
(test/tests/restart/restart_transient_from_steady/steady_with_sub.i)

Child Objects

(modules/stochastic_tools/include/multiapps/SamplerFullSolveMultiApp.h)

(test/tests/multiapps/full_solve_multiapp/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 = Steady

  solve_type = 'PJFNK'

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

[Outputs]
  exodus = true
  perf_graph = true
[]

[MultiApps]
  [full_solve]
    type = FullSolveMultiApp
    # not setting app_type to use the same app type of master, i.e. MooseTestApp
    execute_on = initial
    positions = '0 0 0'
    input_files = sub.i
  []
[]

(modules/stochastic_tools/test/tests/multiapps/commandline_control/master_wrong_multiapp_type.i)

[StochasticTools]
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    positions = '0 0 0
                 1 1 1'
    input_files = 'sub.i'
  []
[]

[Distributions]
  [uniform]
    type = Uniform
    lower_bound = 5
    upper_bound = 10
  []
[]

[Samplers]
  [sample]
    type = MonteCarlo
    num_rows = 2
    distributions = 'uniform'
    execute_on = PRE_MULTIAPP_SETUP
  []
[]

[Controls]
  [cmdline]
    type = MultiAppCommandLineControl
    multi_app = sub
    sampler = sample
    param_names = 'Mesh/nx'
  []
[]

(test/tests/controls/restrict_exec_flag/exec_flag_error.i)

[Mesh]
  type = GeneratedMesh
  dim = 1
[]

[Problem]
  type = FEProblem
  solve = false
[]

[Executioner]
  type = Steady
[]

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

[Controls]
  [test]
    type = TestControl
    test_type = 'execflag_error'
  []
[]

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

[Mesh]
  type = GeneratedMesh
  dim = 1
[]

[Problem]
  type = FEProblem
  solve = false
[]

[Executioner]
  type = Steady
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    positions = '0 0 0
                 1 1 1'
    input_files = 'sub.i'
    cli_args = 'Mesh/nx=10 Mesh/nx=100'
  []
[]

(test/tests/transfers/multiapp_copy_transfer/second_lagrange_from_sub/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  elem_type = QUAD8
[]

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

[Problem]
  type = FEProblem
  solve = false
[]

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

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    input_files = sub.i
    execute_on = initial
  [../]
[]

[Transfers]
  [./from_sub]
    type = MultiAppCopyTransfer
    direction = from_multiapp
    source_variable = u
    variable = u
    multi_app = sub
  [../]
[]

[Outputs]
  exodus = true
[]

(test/tests/restart/restart_subapp_not_master/two_step_solve_master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = -1
  xmax =  1
  ymin = -1
  ymax =  1
  nx = 2
  ny = 2
  elem_type = QUAD9
[]

[Functions]
  [./exact_fn]
    type = ParsedFunction
    value = t*t*(x*x+y*y)
  [../]

  [./forcing_fn]
    type = ParsedFunction
    value = 2*t*(x*x+y*y)-4*t*t
  [../]
[]

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

[ICs]
  active = ''
  [./u_var]
    type = FunctionIC
    variable = u
    function = exact_fn
  [../]
[]

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

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

  [./ffn]
    type = BodyForce
    variable = u
    function = forcing_fn
  [../]
[]

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

[Postprocessors]
  [./average]
    type = ElementAverageValue
    variable = u
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = Transient
  start_time = 2.0
  end_time = 4.0
  dt = 1.0
[]

[MultiApps]
  [./full_solve]
    type = FullSolveMultiApp
    execute_on = initial
    positions = '0 0 0'
    # input file will come from cli-args
  [../]
[]

[Transfers]
  [./transfer_u]
    type = MultiAppProjectionTransfer
    multi_app = full_solve
    direction = FROM_MULTIAPP
    variable = u
    source_variable = u
  [../]
[]

[Outputs]
  #file_base will come from cli-args
  exodus = true
[]

(test/tests/misc/check_error/multi_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 = Steady

  solve_type = 'PJFNK'

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

[Outputs]
  exodus = true
  perf_graph = true
[]

[MultiApps]
  [./full_solve]
    # not setting app_type to use the same app type of master, i.e. MooseTestApp
    type = FullSolveMultiApp
    execute_on = initial
    positions = '0 0 0'
    input_files = multi_sub.i
  [../]
[]

(test/tests/transfers/multiapp_copy_transfer/array_variable_transfer/master.i)

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

[Variables]
  # Array variable with two components
  [v]
    order = FIRST
    family = LAGRANGE
    components = 2
  []
[]

[Problem]
  type = FEProblem
  solve = false
[]

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

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    input_files = sub.i
    execute_on = initial
  [../]
[]

[Transfers]
  # Transfers all components together on the same mesh.
  [./from_sub]
    type = MultiAppCopyTransfer
    direction = from_multiapp
    source_variable = u
    variable = v
    multi_app = sub
  [../]
[]

[Outputs]
  exodus = true
[]

(modules/level_set/test/tests/transfers/copy_solution/master.i)

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

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

[ICs]
  [./u_ic]
    type = FunctionIC
    function = 'x*x*y'
    variable = u
  [../]
[]

[Problem]
  solve = false
[]

[Executioner]
  type = Transient
  num_steps = 1
[]

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    input_files = 'sub.i'
    execute_on = timestep_end
  [../]
[]

[Transfers]
  [./to_sub]
    type = MultiAppCopyTransfer
    variable = u
    source_variable = u
    direction = to_multiapp
    multi_app = sub
    execute_on = timestep_end
    check_multiapp_execute_on = false
  [../]
[]

[Outputs]
  exodus = true
[]

(test/tests/transfers/multiapp_copy_transfer/errors/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
  solve_type = 'PJFNK'
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    input_files = sub.i
    execute_on = timestep_end
  [../]
[]

[Transfers]
  [./to_sub]
    type = MultiAppCopyTransfer
    direction = to_multiapp
    source_variable = u
    variable = u
    multi_app = sub
  [../]
[]

[Outputs]
  exodus = true
[]

(test/tests/multiapps/secant/steady_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
  []
  [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 = Steady

  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 = FullSolveMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = 'steady_sub.i'
    clone_master_mesh = true

    transformed_variables = 'v'
  []
[]

[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/secant_postprocessor/steady_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
  []
  [source]
    type = BodyForce
    variable = u
    value = 1
  []
[]

[BCs]
  [left]
    type = PostprocessorDirichletBC
    variable = u
    boundary = left
    postprocessor = 'from_sub'
  []
[]

[Postprocessors]
  [from_sub]
    type = Receiver
    default = 0
  []
  [to_sub]
    type = SideAverageValue
    variable = u
    boundary = right
  []
  [average]
    type = ElementAverageValue
    variable = u
  []
[]

[Executioner]
  type = Steady

  # Solve parameters
  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 = 100
  transformed_postprocessors = 'from_sub'
[]

[Outputs]
  csv = true
  exodus = false
[]

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

    transformed_postprocessors = 'from_main'
  []
[]

[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_copy_transfer/third_monomial_to_sub/master.i)

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

[AuxVariables]
  [./aux]
    family = MONOMIAL
    order = THIRD
  [../]
[]

[AuxKernels]
  [./aux]
    type = FunctionAux
    function = x*y
    variable = aux
    execute_on = initial
  [../]
[]

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

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    input_files = sub.i
    execute_on = timestep_end
  [../]
[]

[Transfers]
  [./to_sub]
    type = MultiAppCopyTransfer
    direction = to_multiapp
    source_variable = aux
    variable = u
    multi_app = sub
  [../]
[]

[Outputs]
  hide = 'u'
  exodus = true
[]

(test/tests/outputs/perf_graph/multi_app/master_full.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 = Steady

  solve_type = 'PJFNK'

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

[Outputs]
  perf_graph = true
[]

[MultiApps]
  [./full_solve]
    type = FullSolveMultiApp
    execute_on = initial
    positions = '0 0 0'
    input_files = sub_full.i
  [../]
[]

(test/tests/transfers/multiapp_copy_transfer/tagged_solution/main.i)

[Problem]
  solve = false
[]

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

[MultiApps/sub]
  type = FullSolveMultiApp
  input_files = sub.i
[]

[Transfers/to_sub]
  type = MultiAppCopyTransfer
  direction = to_multiapp
  multi_app = sub
  source_variable = x
  to_solution_tag = tagged_aux_sol
  variable = force
[]

[AuxVariables/x]
  initial_condition = 1
[]

[Executioner]
  type = Steady
[]

(test/tests/transfers/multiapp_conservative_transfer/master_power_density.i)

[Mesh]
  [gen]
    type = GeneratedMeshGenerator
    dim = 2
    xmax = 1
    ymax = 1
    nx = 10
    ny = 10
  []
  [block1]
    input = gen
    type = SubdomainBoundingBoxGenerator
    block_id = 1
    bottom_left = '0.5 0 0'
    top_right = '1 1 0'
  []
[]

[Variables]
  [power_density]
  []
[]

[Functions]
  [pwr_func]
    type = ParsedFunction
    value = '1e3*x*(1-x)+5e2'
  []
[]

[Kernels]
  [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
  []
[]

[AuxVariables]
  [from_sub]
  []
[]

[Postprocessors]
  [pwr0]
    type = ElementIntegralVariablePostprocessor
    block = 0
    variable = power_density
  []
  [pwr1]
    type = ElementIntegralVariablePostprocessor
    block = 1
    variable = power_density
  []
  [from_sub0]
    type = ElementIntegralVariablePostprocessor
    block = 0
    variable = from_sub
    execute_on = 'transfer'
  []
  [from_sub1]
    type = ElementIntegralVariablePostprocessor
    block = 1
    variable = from_sub
    execute_on = 'transfer'
  []
[]

[Executioner]
  type = Steady
  solve_type = 'PJFNK'
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    input_files = sub_power_density.i
    positions = '0 0 0 0.5 0 0'
    execute_on = timestep_end
  []
[]

[Transfers]
  [to_sub]
    type = MultiAppMeshFunctionTransfer
    direction = to_multiapp
    source_variable = power_density
    variable = from_master
    multi_app = sub
    execute_on = timestep_end

    # The following inputs specify what postprocessors should be conserved
    # N pps are specified on the master side, where N is the number of subapps
    # 1 pp is specified on the subapp side
    from_postprocessors_to_be_preserved = 'pwr0 pwr1'
    to_postprocessors_to_be_preserved = 'from_master_pp'
  []

  [from_sub]
    type = MultiAppMeshFunctionTransfer
    direction = from_multiapp
    source_variable = sink
    variable = from_sub
    multi_app = sub
    execute_on = timestep_end

    # The following inputs specify what postprocessors should be conserved
    # N pps are specified on the master side, where N is the number of subapps
    # 1 pp is specified on the subapp side
    to_postprocessors_to_be_preserved = 'from_sub0 from_sub1'
    from_postprocessors_to_be_preserved = 'sink'
  []
[]

[Outputs]
  exodus = true
[]

(test/tests/multiapps/initial_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
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    execute_on = initial
    input_files = sub.i
  [../]
[]

(test/tests/transfers/multiapp_high_order_variable_transfer/master_L2_Lagrange_conservative.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 20
  ny = 20
[]

[Variables]
  [power_density]
    family = L2_LAGRANGE
    order = FIRST
  []
[]

[Functions]
  [pwr_func]
    type = ParsedFunction
    value = '1e3*x*(1-x)+5e2'
  []
[]

[Kernels]
  [diff]
    type = Reaction
    variable = power_density
  []

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

[Postprocessors]
  [pwr_avg]
    type = ElementAverageValue
    block = '0'
    variable = power_density
    execute_on = 'initial timestep_end'
  []
[]

[Executioner]
  type = Steady
  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
[]

[Postprocessors]
  [./from_postprocessor]
    type = ElementIntegralVariablePostprocessor
    variable = power_density
  [../]
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files  = sub_L2_Lagrange_conservative.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'
    from_postprocessors_to_be_preserved  = 'from_postprocessor'
    to_postprocessors_to_be_preserved  = 'pwr_density'
  []
[]

[Outputs]
  exodus = true
  perf_graph = true
[]

(test/tests/multiapps/steffensen/steady_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
  []
  [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 = Steady

  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'
  accept_on_max_fixed_point_iteration = true
[]

[Outputs]
  csv = true
  exodus = false
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = 'steady_sub.i'
    clone_master_mesh = true

    transformed_variables = 'v'
  []
[]

[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_copy_transfer/constant_monomial_to_sub/master.i)

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

[AuxVariables]
  [./aux]
    family = MONOMIAL
    order = CONSTANT
  [../]
[]

[AuxKernels]
  [./aux]
    type = FunctionAux
    function = x*y
    variable = aux
    execute_on = initial
  [../]
[]

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

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    input_files = sub.i
    execute_on = timestep_end
  [../]
[]

[Transfers]
  [./to_sub]
    type = MultiAppCopyTransfer
    direction = to_multiapp
    source_variable = aux
    variable = u
    multi_app = sub
  [../]
[]

[Outputs]
  exodus = true
[]

(test/tests/multiapps/picard/pseudo_transient_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
  [../]
  [./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
    execute_on = 'initial timestep_end'
  [../]
  [./vnorm]
    type = ElementL2Norm
    variable = v
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = Steady
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  fixed_point_rel_tol = 1e-6
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    input_files = pseudo_transient_picard_sub.i
    no_backup_and_restore = 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/picard/steady_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
  [../]
  [./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
    execute_on = 'initial timestep_end'
  [../]
  [./vnorm]
    type = ElementL2Norm
    variable = v
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = Steady
  nl_abs_tol = 1e-14
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 10
  fixed_point_rel_tol = 1e-6
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    input_files = steady_picard_sub.i
    no_backup_and_restore = 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_conservative_transfer/primary_negative_adjuster.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 1
  ny = 1
[]

[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
  []
[]

[AuxVariables]
  [var]
    family = MONOMIAL
    order = THIRD
  []
[]

[ICs]
  [var_ic]
    type = FunctionIC
    variable = var
    function = '-exp(x * y)'
  []
[]

[Executioner]
  type = Steady
  solve_type = 'PJFNK'
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    input_files = secondary_negative_adjuster.i
    execute_on = timestep_end
  []
[]

[Postprocessors]
  [from_postprocessor]
    type = ElementIntegralVariablePostprocessor
    variable = var
  []
[]

[Transfers]
  [to_sub]
    type = MultiAppMeshFunctionTransfer
    direction = to_multiapp
    source_variable = var
    variable = var
    multi_app = sub
    from_postprocessors_to_be_preserved  = 'from_postprocessor'
    to_postprocessors_to_be_preserved  = 'to_postprocessor'
  []
[]

[Outputs]
  exodus = true
[]

(test/tests/restart/restart_transient_from_steady/steady_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]
  [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 final'
  []
  [temp_max]
    type = ElementExtremeValue
    value_type = max
    variable = Tf
    execute_on = 'initial final'
  []
  [temp_min]
    type = ElementExtremeValue
    value_type = min
    variable = Tf
    execute_on = 'initial final'
  []
[]

[Executioner]
  type = Steady
  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

  fixed_point_rel_tol = 1E-7
  fixed_point_abs_tol = 1.0e-07
  fixed_point_max_its = 12
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    app_type = MooseTestApp
    positions = '0   0 0
                 0.5 0 0'
    input_files  = steady_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
  checkpoint = true
  execute_on = 'INITIAL TIMESTEP_END FINAL'
[]

(test/tests/multiapps/picard/steady_custom_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
  [../]
  [./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
    execute_on = 'initial timestep_end'
  [../]
  [./vnorm]
    type = ElementL2Norm
    variable = v
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = SteadyWithPicardCheck
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  disable_fixed_point_residual_norm_check = true
  pp_name = unorm
  pp_step_tol = 1e-4
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    input_files = steady_picard_sub.i
    no_backup_and_restore = 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/command_line/master_common.i)

[Mesh]
  type = GeneratedMesh
  dim = 1
[]

[Problem]
  type = FEProblem
  solve = false
[]

[Executioner]
  type = Steady
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    positions = '0 0 0
                 1 1 1'
    input_files = 'sub.i'
    cli_args = 'Mesh/nx=42'
  []
[]

(test/tests/multiapps/picard_multilevel/fullsolve_multilevel/master.i)

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

[Variables]
  [u]
  []
[]

[AuxVariables]
  [v]
    initial_condition = 50
  []
[]

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

[BCs]
  [dirichlet0]
    type = DirichletBC
    variable = u
    boundary = '3'
    value = 0
  []
  [dirichlet]
    type = DirichletBC
    variable = u
    boundary = '1'
    value = 100
  []
[]

[Postprocessors]
  [avg_u]
    type = ElementAverageValue
    variable = u
    execute_on = 'initial linear'
  []
  [avg_v]
    type = ElementAverageValue
    variable = v
    execute_on = 'initial linear'
  []
[]


[Executioner]
  type = Steady
  petsc_options_iname = '-pc_type -pc_hypre_type -ksp_gmres_restart '
  petsc_options_value = 'hypre boomeramg 100'

  fixed_point_rel_tol = 1E-3
  fixed_point_abs_tol = 1.0e-05
  fixed_point_max_its = 12
[]

[MultiApps]
  [level1-]
    type = FullSolveMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = sub_level1.i
    execute_on = 'timestep_end'

    # We have to make backups of the full tree in order to do a proper restore for the Picard iteration.
    no_backup_and_restore = false
  []
[]

[Transfers]
  [u_to_sub]
    type = MultiAppMeshFunctionTransfer
    direction = to_multiapp
    source_variable = u
    variable = u
    multi_app = level1-
    execute_on = 'timestep_end'
  []
  [v_from_sub]
    type = MultiAppMeshFunctionTransfer
    direction = from_multiapp
    source_variable = v
    variable = v
    multi_app = level1-
    execute_on = 'timestep_end'
  []
[]

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

(test/tests/transfers/multiapp_copy_transfer/linear_lagrange_from_sub/master.i)

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

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

[Problem]
  type = FEProblem
  solve = false
[]

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

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    input_files = sub.i
    execute_on = initial
  [../]
[]

[Transfers]
  [./from_sub]
    type = MultiAppCopyTransfer
    direction = from_multiapp
    source_variable = u
    variable = u
    multi_app = sub
  [../]
[]

[Outputs]
  exodus = true
[]

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

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

[Variables]
  [u]
  []
[]

[AuxVariables]
  [v]
    initial_condition = 50
  []
[]

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

[BCs]
  [dirichlet0]
    type = DirichletBC
    variable = u
    boundary = '3'
    value = 0
  []
  [dirichlet]
    type = DirichletBC
    variable = u
    boundary = '1'
    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'
  []
[]


[Executioner]
  type = Steady
  petsc_options_iname = '-pc_type -pc_hypre_type -ksp_gmres_restart '
  petsc_options_value = 'hypre boomeramg 100'

  fixed_point_rel_tol = 1E-3
  fixed_point_abs_tol = 1.0e-05
  fixed_point_max_its = 2
  accept_on_max_fixed_point_iteration = true
[]

[MultiApps]
  [level1-]
    type = FullSolveMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files = sub_level1.i
    execute_on = 'timestep_end'
    keep_solution_during_restore = true
  []
[]

[Transfers]
  [u_to_sub]
    type = MultiAppMeshFunctionTransfer
    direction = to_multiapp
    source_variable = u
    variable = u
    multi_app = level1-
    execute_on = 'timestep_end'
  []
  [v_from_sub]
    type = MultiAppMeshFunctionTransfer
    direction = from_multiapp
    source_variable = v
    variable = v
    multi_app = level1-
    execute_on = 'timestep_end'
  []
[]

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

(test/tests/transfers/multiapp_projection_transfer/high_order_master.i)

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

[Functions]
  [./test_function]
    type = ParsedFunction
    value = '2.5*x^2 + 0.75*y^2 + 0.15*x*y'
  [../]
[]

[AuxVariables]
  [./from_sub]
    family = monomial
    order = first
  [../]
  [./test_var]
    family = monomial
    order = first
    [./InitialCondition]
      type = FunctionIC
      function = test_function
    [../]
  [../]
[]

[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 = Steady
  solve_type = PJFNK
[]

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

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    app_type = MooseTestApp
    execute_on = initial
    positions = '0.0 0.0 0.0'
    input_files = high_order_sub.i
  [../]
[]

[Transfers]
  [./from]
    type = MultiAppProjectionTransfer
    direction = from_multiapp
    execute_on = same_as_multiapp
    multi_app = sub
    source_variable = test_var
    variable = from_sub
  [../]
  [./to]
    type = MultiAppProjectionTransfer
    direction = to_multiapp
    execute_on = same_as_multiapp
    multi_app = sub
    source_variable = test_var
    variable = from_master
  [../]
[]

(test/tests/problems/eigen_problem/eigensolvers/ne_coupled_picard.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0
  xmax = 10
  ymin = 0
  ymax = 10
  elem_type = QUAD4
  nx = 8
  ny = 8
[]

[Variables]
  [./u]
    order = FIRST
    family = LAGRANGE
    # set this so that the Picard initial norm is not zero
    initial_condition = 1
  [../]
[]

[AuxVariables]
  [./T]
    order = FIRST
    family = LAGRANGE
    # set this so that the Picard initial norm is not zero
    initial_condition = 1
  [../]
  [./power]
    order = FIRST
    family = LAGRANGE
  [../]
[]

[Kernels]
  [./diff]
    type = DiffMKernel
    variable = u
    mat_prop = diffusion
    offset = 0.0
  [../]

  [./rhs]
    type = CoefReaction
    variable = u
    coefficient = -1.0
    extra_vector_tags = 'eigen'
  [../]
[]

[AuxKernels]
  [./power_ak]
    type = NormalizationAux
    variable = power
    source_variable = u
    normalization = unorm
    # this coefficient will affect the eigenvalue.
    normal_factor = 10
    execute_on = timestep_end
  [../]
[]

[BCs]
  [./homogeneous]
    type = DirichletBC
    variable = u
    boundary = '0 1 2 3'
    value = 0
  [../]

  [./eigenU]
    type = EigenDirichletBC
    variable = u
    boundary = '0 1 2 3'
  [../]
[]

[Materials]
  [./dc]
    type = VarCouplingMaterial
    var = T
    block = 0
    base = 1.0
    coef = 1.0
  [../]
[]

[Executioner]
  type = Eigenvalue
  solve_type = PJFNK
  nl_abs_tol = 1e-8
  nl_rel_tol = 1e-6
  fixed_point_max_its = 10
  fixed_point_rel_tol = 1e-6
[]

[Postprocessors]
  [./unorm]
    type = ElementIntegralVariablePostprocessor
    variable = u
    execute_on = linear
  [../]
[]

[VectorPostprocessors]
  [./eigenvalues]
    type = Eigenvalues
    execute_on = 'timestep_end'
  [../]
[]

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

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    input_files = ne_coupled_picard_sub.i
    execute_on = timestep_end
  [../]
[]

[Transfers]
  [./T_from_sub]
    type = MultiAppMeshFunctionTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = T
    variable = T
  [../]
  [./power_to_sub]
    type = MultiAppMeshFunctionTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = power
    variable = power
  [../]
[]

(test/tests/transfers/multiapp_copy_transfer/linear_lagrange_to_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
  solve_type = 'PJFNK'
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    input_files = sub.i
    execute_on = timestep_end
  [../]
[]

[Transfers]
  [./to_sub]
    type = MultiAppCopyTransfer
    direction = to_multiapp
    source_variable = u
    variable = u
    multi_app = sub
  [../]
[]

[Outputs]
  exodus = true
[]

(test/tests/transfers/multiapp_conservative_transfer/primary_skipped_adjuster.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 1
  ny = 1
[]

[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
  []
[]

[AuxVariables]
  [var]
    family = MONOMIAL
    order = THIRD
  []
[]

[ICs]
  [var_ic]
    type = FunctionIC
    variable = var
    function = '-exp(x * y)'
  []
[]

[Executioner]
  type = Steady
  solve_type = 'PJFNK'
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    input_files = secondary_negative_adjuster.i
    execute_on = timestep_begin
  []
[]

[Postprocessors]
  [from_postprocessor]
    type = ElementIntegralVariablePostprocessor
    variable = var
  []
[]

[Transfers]
  [to_sub]
    type = MultiAppMeshFunctionTransfer
    direction = to_multiapp
    source_variable = var
    variable = var
    multi_app = sub
    from_postprocessors_to_be_preserved  = 'from_postprocessor'
    to_postprocessors_to_be_preserved  = 'to_postprocessor'
    allow_skipped_adjustment = true
  []
[]

[Outputs]
  exodus = true
[]

(test/tests/multiapps/picard/picard_custom_postprocessor.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
  [../]
  [./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_begin]
    type = ElementL2Norm
    variable = u
    execute_on = 'initial timestep_begin'
    outputs = none
  [../]
  [./unorm]
    type = ElementL2Norm
    variable = u
    execute_on = 'initial timestep_end'
  [../]
  [./unorm_err]
    type = RelativeDifferencePostprocessor
    value1 = unorm
    value2 = unorm_begin
    outputs = none
  [../]
  [./vnorm]
    type = ElementL2Norm
    variable = v
    execute_on = 'initial timestep_end'
  [../]
[]

[Executioner]
  type = Steady
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
  fixed_point_max_its = 30
  disable_fixed_point_residual_norm_check = true
  custom_pp = unorm_err
  nl_abs_tol = 1e-14
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    input_files = steady_picard_sub.i
    no_backup_and_restore = 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/picard_postprocessor/steady_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
  []
  [source]
    type = BodyForce
    variable = u
    value = 1
  []
[]

[BCs]
  [left]
    type = PostprocessorDirichletBC
    variable = u
    boundary = left
    postprocessor = 'from_sub'
  []
[]

[Postprocessors]
  [from_sub]
    type = Receiver
    default = 0
  []
  [to_sub]
    type = SideAverageValue
    variable = u
    boundary = right
  []
  [average]
    type = ElementAverageValue
    variable = u
  []
[]

[Executioner]
  type = Steady

  # Solve parameters
  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 = 100
  fixed_point_rel_tol = 0.5  # pseudo transient is slow to converge
  relaxation_factor = 0.8
  transformed_postprocessors = 'from_sub'
[]

[Outputs]
  csv = true
  exodus = false
[]

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

    relaxation_factor = 0.8
    transformed_postprocessors = 'from_main'
  []
[]

[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_copy_transfer/multivariable_copy/master.i)

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

[Variables]
  # Create two variables
  [./u]
  [../]
  [./v]
  [../]
[]

[Problem]
  type = FEProblem
  solve = false
[]

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

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    input_files = sub.i
    execute_on = initial
  [../]
[]

[Transfers]
  # Transfer both variables by inputting a vector of their names
  [./from_sub]
    type = MultiAppCopyTransfer
    direction = from_multiapp
    source_variable = 'u v'
    variable = 'u v'
    multi_app = sub
  [../]
[]

[Outputs]
  exodus = true
[]

(test/tests/transfers/multiapp_copy_transfer/second_lagrange_to_sub/master.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 10
  ny = 10
  elem_type = QUAD9
[]

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

[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'
[]

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    input_files = sub.i
    execute_on = timestep_end
  [../]
[]

[Transfers]
  [./to_sub]
    type = MultiAppCopyTransfer
    direction = to_multiapp
    source_variable = u
    variable = u
    multi_app = sub
  [../]
[]

[Outputs]
  exodus = true
[]

(modules/combined/test/tests/restart-transient-from-ss-with-stateful/master_ss.i)

[Mesh]
  [gen]
    type = GeneratedMeshGenerator
    nx = 8
    ny = 8
    xmin = -82.627
    xmax = 82.627
    ymin = -82.627
    ymax = 82.627
    dim = 2
  []
[]

[Variables]
  [./temp]
    order = FIRST
    family = LAGRANGE
    initial_condition = 500
  [../]
[]

[AuxVariables]
  [./power]
    order = FIRST
    family = L2_LAGRANGE
    initial_condition = 350
  [../]
[]

[Kernels]
  [./heat]
    type = HeatConduction
    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 = 'initial timestep_end'
  [../]
  [./avg_power]
    type = ElementAverageValue
    variable = power
  [../]
[]

[Executioner]
  type = Steady
  petsc_options_iname = '-pc_type -pc_hypre_type -ksp_gmres_restart'
  petsc_options_value = 'hypre boomeramg 300'
  line_search = 'none'

  l_tol = 1e-05
  nl_rel_tol = 1e-12
  nl_abs_tol = 1e-9

  l_max_its = 50
  nl_max_its = 25
[]

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

  [checkpoint]
    type = Checkpoint
    num_files = 2
    additional_execute_on = 'FINAL' # seems to be a necessary to avoid a Checkpoint bug
  []
[]

[MultiApps]
  [./bison]
    type = FullSolveMultiApp
    positions = '0 0 0'
    input_files = 'sub_ss.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/multiapps/initial_transfer/master.i)

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

[Problem]
  kernel_coverage_check = false
[]

[Variables][dummy][][]

[Functions]
  [func]
    type = ConstantFunction
    value = 1
  []
[]

[Postprocessors]
  [c]
    type = FunctionValuePostprocessor
    function = func
    execute_on = initial
    # this will force this postprocessor to be evaluated before transfer on initial
    force_preic = true
  []
[]

[Executioner]
  type = Steady
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    input_files = sub.i
    execute_on = initial
  [../]
[]

[Transfers]
  [to_sub]
    type = MultiAppPostprocessorTransfer
    direction = to_multiapp
    multi_app = sub
    from_postprocessor = c
    to_postprocessor = receiver
  []
[]

(test/tests/transfers/multiapp_copy_transfer/third_monomial_from_sub/master.i)

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

[Variables]
  [./u]
    family = MONOMIAL
    order = THIRD
  [../]
[]

[Problem]
  type = FEProblem
  solve = false
[]

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

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    input_files = sub.i
    execute_on = initial
  [../]
[]

[Transfers]
  [./from_sub]
    type = MultiAppCopyTransfer
    direction = from_multiapp
    source_variable = aux
    variable = u
    multi_app = sub
  [../]
[]

[Outputs]
  exodus = true
[]

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

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

[Variables]
  [u]
  []
[]

[Problem]
  kernel_coverage_check = false
  solve = false
[]

[Executioner]
  type = Transient
  num_steps = 2
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [full_solve]
    type = FullSolveMultiApp
    execute_on = initial
    positions = '0 0 0'
    input_files = sub.i
    reset_apps = '0'
    reset_time = 1
  [../]
[]

(test/tests/multiapps/command_line/master_wrong_size.i)

[Mesh]
  type = GeneratedMesh
  dim = 1
[]

[Problem]
  type = FEProblem
  solve = false
[]

[Executioner]
  type = Steady
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    positions = '0 0 0
                 1 1 1'
    input_files = 'sub.i'
    cli_args = 'Mesh/xmax=1.1 Mesh/xmax=1.2 Mesh/xmax=1.3'
  []
[]

(test/tests/vectorpostprocessors/csv_reader/transfer/master.i)

[Mesh]
  type = GeneratedMesh
  parallel_type = 'replicated'
  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
  [../]
[]

[MultiApps]
  [./master]
    type = FullSolveMultiApp
    input_files = 'sub.i'
    execute_on = initial
  [../]
[]

[Transfers]
  [./transfer]
    type = MultiAppUserObjectTransfer
    multi_app = master
    direction = to_multiapp
    user_object = data
    variable = aux
  [../]
[]

[VectorPostprocessors]
  [./data]
    type = CSVReader
    csv_file = 'example.csv'
  [../]
[]


[Executioner]
  type = Steady
  solve_type = 'PJFNK'
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[Outputs]
  exodus = true
[]

(test/tests/transfers/multiapp_high_order_variable_transfer/master_L2_Lagrange.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 20
  ny = 20
[]

[Variables]
  [power_density]
    family = L2_LAGRANGE
    order = FIRST
  []
[]

[Functions]
  [pwr_func]
    type = ParsedFunction
    value = '1e3*x*(1-x)+5e2'
  []
[]

[Kernels]
  [diff]
    type = Reaction
    variable = power_density
  []

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

[Postprocessors]
  [pwr_avg]
    type = ElementAverageValue
    block = '0'
    variable = power_density
    execute_on = 'initial timestep_end'
  []
[]

[Executioner]
  type = Steady
  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
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files  = sub_L2_Lagrange.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'
  []
[]

[Outputs]
  exodus = true
  perf_graph = true
[]

(test/tests/transfers/multiapp_high_order_variable_transfer/master_L2_Lagrange_userobject.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 20
  ny = 20
  parallel_type = replicated
[]

[Variables]
  [power_density]
    family = L2_LAGRANGE
    order = FIRST
  []
[]

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

[UserObjects]
  [./multi_layered_average]
    type = LayeredAverage
    variable = power_density
    direction = y
    num_layers = 4
  [../]
[]

[AuxKernels]
  [./layered_aux]
    type = SpatialUserObjectAux
    variable = multi_layered_average
    execute_on = 'nonlinear TIMESTEP_END'
    user_object = multi_layered_average
  [../]
[]

[Functions]
  [pwr_func]
    type = ParsedFunction
    value = '1e3*x*(1-x)+5e2'
  []
[]

[Kernels]
  [diff]
    type = Reaction
    variable = power_density
  []

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

[Postprocessors]
  [layered_avg]
    type = ElementAverageValue
    block = '0'
    variable = multi_layered_average
    execute_on = 'initial timestep_end'
  []
[]

[Executioner]
  type = Steady
  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
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files  = sub_L2_Lagrange.i
    execute_on = 'timestep_end'
  []
[]

[Transfers]
  [p_to_sub]
    type = MultiAppUserObjectTransfer
    direction = to_multiapp
    user_object = multi_layered_average
    variable = power_density
    multi_app = sub
    execute_on = 'timestep_end'
  []
[]

[Outputs]
  exodus = true
  perf_graph = true
[]

(test/tests/problems/eigen_problem/eigensolvers/ne_coupled_picard_subT.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  xmin = 0
  xmax = 10
  ymin = 0
  ymax = 10
  elem_type = QUAD4
  nx = 8
  ny = 8
[]

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

[AuxVariables]
  [./power]
    order = FIRST
    family = LAGRANGE
    initial_condition = 0.1
  [../]
[]

[Kernels]
  [./diff_T]
    type = Diffusion
    variable = T
  [../]
  [./src_T]
    type = CoupledForce
    variable = T
    v = power
  [../]
[]

[BCs]
  [./homogeneousT]
    type = DirichletBC
    variable = T
    boundary = '0 1 2 3'
    value = 0
  [../]
[]

[Executioner]
  type = Steady
  solve_type = PJFNK
  nl_abs_tol = 1e-8
  nl_rel_tol = 1e-6
  fixed_point_max_its = 20
  fixed_point_rel_tol = 1e-6
[]

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    keep_solution_during_restore = true
    input_files = ne_coupled_picard_subT_sub.i
    execute_on = timestep_end
  [../]
[]

[Transfers]
  [./T_to_sub]
    type = MultiAppMeshFunctionTransfer
    direction = to_multiapp
    multi_app = sub
    source_variable = T
    variable = T
    execute_on = timestep_end
  [../]
  [./power_from_sub]
    type = MultiAppMeshFunctionTransfer
    direction = from_multiapp
    multi_app = sub
    source_variable = power
    variable = power
    execute_on = timestep_end
  [../]
[]

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

(test/tests/transfers/multiapp_conservative_transfer/master_nearest_point.i)

[Mesh]
  [gen]
    type = GeneratedMeshGenerator
    dim = 2
    xmax = 1
    ymax = 1
    nx = 10
    ny = 10
  []
  [block1]
    input = gen
    type = SubdomainBoundingBoxGenerator
    block_id = 1
    bottom_left = '0.5 0 0'
    top_right = '1 1 0'
  []
[]

[Variables]
  [power_density]
  []
[]

[Functions]
  [pwr_func]
    type = ParsedFunction
    value = '1e3*x*(1-x)+5e2'
  []
[]

[Kernels]
  [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
  []
[]

[AuxVariables]
  [from_sub]
  []
[]

[VectorPostprocessors]
  [from_nearest_point]
    type = NearestPointIntegralVariablePostprocessor
    variable = power_density
    points = '0 0.5 0 1 0.5 0'
  []

  [to_nearest_point]
    type = NearestPointIntegralVariablePostprocessor
    variable = from_sub
    points = '0 0.5 0 1 0.5 0'
    execute_on = 'transfer'
  []
[]

[Executioner]
  type = Steady
  solve_type = 'PJFNK'
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    input_files = sub_nearest_point.i
    positions = '0 0 0 0.5 0 0'
    execute_on = timestep_end
  []
[]

[Transfers]
  [to_sub]
    type = MultiAppMeshFunctionTransfer
    direction = to_multiapp
    source_variable = power_density
    variable = from_master
    multi_app = sub
    execute_on = timestep_end

    # The following inputs specify what postprocessors should be conserved
    # 1 NearestPointIntegralVariablePostprocessor is specified on the master
    # side with N points, where N is the number of subapps
    # 1 pp is specified on the subapp side
    from_postprocessors_to_be_preserved = 'from_nearest_point'
    to_postprocessors_to_be_preserved = 'from_master_pp'
  []

  [from_sub]
    type = MultiAppMeshFunctionTransfer
    direction = from_multiapp
    source_variable = sink
    variable = from_sub
    multi_app = sub
    execute_on = timestep_end

    # The following inputs specify what postprocessors should be conserved
    # 1 NearestPointIntegralVariablePostprocessor is specified on the master
    # with N points, where N is the number of subapps
    # 1 pp is specified on the subapp side
    to_postprocessors_to_be_preserved = 'to_nearest_point'
    from_postprocessors_to_be_preserved = 'sink'
  []
[]

[Outputs]
  csv = true
  exodus = true
[]

(test/tests/transfers/multiapp_transfer_transformation/transfer_transformation.i)

[Mesh]
  [./gmg]
    type = GeneratedMeshGenerator
    dim = 2
    nx = 3
    ny = 5
    nz = 0
    xmax = 0.8
    xmin = 0.2
    zmin = 0
    zmax = 0
    elem_type = QUAD4
  []

  [./subdomain_id]
    type = ElementSubdomainIDGenerator
    input = gmg
    subdomain_ids = '0 1 2
                     0 1 2
                     0 1 2
                     0 1 2
                     0 1 2'
  []

  [./boundary01]
    type = SideSetsBetweenSubdomainsGenerator
    input = subdomain_id
    primary_block = '0'
    paired_block = '1'
    new_boundary = 'boundary01'
  []

  [./boundary10]
    type = SideSetsBetweenSubdomainsGenerator
    input = boundary01
    primary_block = '1'
    paired_block = '0'
    new_boundary = 'boundary10'
  []

  [./boundary12]
    type = SideSetsBetweenSubdomainsGenerator
    input = boundary10
    primary_block = '1'
    paired_block = '2'
    new_boundary = 'boundary12'
  []

  [./boundary21]
    type = SideSetsBetweenSubdomainsGenerator
    input = boundary12
    primary_block = '2'
    paired_block = '1'
    new_boundary = 'boundary21'
  []

  uniform_refine = 3
[]

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

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

[AuxVariables]
  [./fromsubelem]
    order = constant
    family = monomial
  [../]

  [./fromsub]
  []
[]

[BCs]
  [./left0]
    type = DirichletBC
    variable = u
    boundary = left
    value = 0
  [../]

  [./right0]
    type = DirichletBC
    variable = u
    boundary = boundary01
    value = 1
  [../]

  [./right1]
    type = DirichletBC
    variable = u
    boundary = boundary12
    value = 0
  [../]

  [./right2]
    type = DirichletBC
    variable = u
    boundary = right
    value = 1
  [../]
[]

[Executioner]
  type = Steady
  solve_type = 'NEWTON'
[]

[Outputs]
  exodus = true
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    app_type = MooseTestApp
    positions = '0.0  0.0  0.0'
    execute_on = 'timestep_end'
    input_files = transfer_transformation_sub.i
  []
[]

[Transfers]
  [from_sub]
    type = MultiAppInterpolationTransfer
    direction = from_multiapp
    multi_app = sub
    num_points = 1
    shrink_gap_width = 0.2
    shrink_mesh = 'source'
    source_variable = 'u'
    variable = 'fromsub'
    exclude_gap_blocks = '1 3'
  []

  [from_sub_elem]
    type = MultiAppInterpolationTransfer
    direction = from_multiapp
    multi_app = sub
    num_points = 4
    shrink_gap_width = 0.2
    shrink_mesh = 'source'
    source_variable = 'u'
    variable = 'fromsubelem'
    exclude_gap_blocks = '1 3'
  []

  [from_master]
    type = MultiAppInterpolationTransfer
    direction = to_multiapp
    multi_app = sub
    num_points = 1
    shrink_gap_width = 0.2
    shrink_mesh = 'target'
    source_variable = 'u'
    exclude_gap_blocks = '1 3'
    variable = 'frommaster'
  []

  [from_master_elem]
    type = MultiAppInterpolationTransfer
    direction = to_multiapp
    multi_app = sub
    num_points = 4
    shrink_gap_width = 0.2
    shrink_mesh = 'target'
    source_variable = 'u'
    exclude_gap_blocks = '1 3'
    variable = 'frommasterelem'
  []
[]

(test/tests/transfers/from_full_solve/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 CONSTANT MONOMIALS are currently not written
  # out correctly in this case.  For more information, see #2122.
  parallel_type = replicated
[]

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

[AuxVariables]
  [./from_full]
  [../]
[]

[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 = Steady

  solve_type = 'PJFNK'

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

[Outputs]
  exodus = true
[]

[MultiApps]
  [./full_solve]
    type = FullSolveMultiApp
    app_type = MooseTestApp
    execute_on = initial
    positions = '0 0 0'
    input_files = sub.i
  [../]
[]

[Transfers]
  [./from_full]
    type = MultiAppNearestNodeTransfer
    direction = from_multiapp
    multi_app = full_solve
    source_variable = u
    variable = from_full
  [../]
[]

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

[Mesh]
  [drmg]
    type = DistributedRectilinearMeshGenerator
    dim = 2
    nx = 30
    ny = 30
    xmax = 2
    elem_type = QUAD4
    partition = square
  []
[]

[Variables]
  [u][]
[]

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

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = 'left'
    value = 1
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = 'right'
    value = 10
  []
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    app_type = MooseTestApp
    input_files = 'target_boundary_sub.i'
    positions = '-1.0 0.0 0.0
                  2. 0.0 0.0'
    output_in_position = true
    execute_on = 'timestep_end'
  []
[]

[Transfers]
  [target_boundary]
    type = MultiAppNearestNodeTransfer
    source_variable = u
    direction = to_multiapp
    multi_app = sub
    variable = source
    target_boundary = 'right'
  []
[]

[Executioner]
  type = Steady
  nl_rel_tol = 1e-6
[]

[Outputs]
  exodus = true
[]

(modules/stochastic_tools/test/tests/multiapps/batch_commandline_control/master_wrong_size.i)

[StochasticTools]
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    positions = '0 0 0
                 1 1 1'
    input_files = 'sub.i'
  []
[]

[Distributions]
  [uniform]
    type = Uniform
    lower_bound = 5
    upper_bound = 10
  []
[]

[Samplers]
  [sample]
    type = MonteCarlo
    num_rows = 10
    distributions = 'uniform'
    execute_on = 'initial timestep_end'
  []
[]

[Controls]
  [cmdline]
    type = MultiAppCommandLineControl
    multi_app = sub
    sampler = sample
    arguments = 'Mesh/nx'
  []
[]

(test/tests/transfers/multiapp_conservative_transfer/master_conservative_transfer.i)

[Mesh]
  type = GeneratedMesh
  dim = 2
  nx = 20
  ny = 20
[]

[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 = Steady
  solve_type = 'PJFNK'
  petsc_options_iname = '-pc_type -pc_hypre_type'
  petsc_options_value = 'hypre boomeramg'
[]

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    input_files = sub_conservative_transfer.i
    execute_on = timestep_end
  [../]
[]

[Postprocessors]
  [./from_postprocessor]
    type = ElementIntegralVariablePostprocessor
    variable = u
  [../]
[]

[Transfers]
  [./to_sub]
    type = MultiAppMeshFunctionTransfer
    direction = to_multiapp
    source_variable = u
    variable = aux_u
    multi_app = sub
    from_postprocessors_to_be_preserved  = 'from_postprocessor'
    to_postprocessors_to_be_preserved  = 'to_postprocessor'
  [../]
[]

[Outputs]
  exodus = true
  [./console]
    type = Console
    execute_postprocessors_on = 'INITIAL nonlinear TIMESTEP_END'
  [../]
[]

(modules/stochastic_tools/test/tests/multiapps/batch_commandline_control/master_wrong_num_params.i)

[StochasticTools]
[]

[Distributions]
  [uniform]
    type = Uniform
    lower_bound = 5
    upper_bound = 10
  []
[]

[Samplers]
  [sample]
    type = MonteCarlo
    num_rows = 3
    distributions = 'uniform uniform'
    execute_on = 'initial timestep_end'
  []
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    positions = '0 0 0
                 1 1 1
                 2 2 2'
    input_files = 'sub.i'
  []
[]

[Controls]
  [cmdline]
    type = MultiAppCommandLineControl
    multi_app = sub
    sampler = sample
    param_names = 'Mesh/xmax Mesh/ymax Mesh/zmax'
  []
[]

(test/tests/multiapps/full_solve_multiapp/master_eigen.i)

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

[Variables]
  [u]
  []
[]

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

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

[Executioner]
  type = NonlinearEigen

  bx_norm = 'unorm'

  solve_type = 'PJFNK'

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

[Postprocessors]
  [unorm]
    type = ElementIntegralVariablePostprocessor
    variable = u
    # execute on residual is important for nonlinear eigen solver!
    execute_on = linear
  []
[]

[Outputs]
  exodus = true
  perf_graph = true
[]

[MultiApps]
  [full_solve]
    type = FullSolveMultiApp
    # not setting app_type to use the same app type of master, i.e. MooseTestApp
    execute_on = initial
    positions = '0 0 0'
    input_files = sub.i
  []
[]

(test/tests/multiapps/full_solve_multiapp/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 = Steady

  solve_type = 'PJFNK'

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

[Outputs]
  exodus = true
  perf_graph = true
[]

[MultiApps]
  [full_solve]
    type = FullSolveMultiApp
    # not setting app_type to use the same app type of master, i.e. MooseTestApp
    execute_on = initial
    positions = '0 0 0'
    input_files = sub.i
  []
[]

(test/tests/multiapps/steffensen_postprocessor/steady_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
  []
  [source]
    type = BodyForce
    variable = u
    value = 1
  []
[]

[BCs]
  [left]
    type = PostprocessorDirichletBC
    variable = u
    boundary = left
    postprocessor = 'from_sub'
  []
[]

[Postprocessors]
  [from_sub]
    type = Receiver
    default = 0
  []
  [to_sub]
    type = SideAverageValue
    variable = u
    boundary = right
  []
  [average]
    type = ElementAverageValue
    variable = u
  []
[]

[Executioner]
  type = Steady

  # Solve parameters
  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 = 100
  transformed_postprocessors = 'from_sub'
[]

[Outputs]
  csv = true
  exodus = false
[]

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

    transformed_postprocessors = 'from_main'
  []
[]

[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_nearest_node_transfer/source_boundary_master.i)

[Mesh]
  [drmg]
    type = DistributedRectilinearMeshGenerator
    dim = 2
    nx = 30
    ny = 30
    xmax = 2
    elem_type = QUAD4
    partition = square
  []
[]

[Variables]
  [u][]
[]

[AuxVariables]
  [from_sub][]
[]

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

[BCs]
  [left]
    type = DirichletBC
    variable = u
    boundary = 'left'
    value = 1
  []
  [right]
    type = DirichletBC
    variable = u
    boundary = 'right'
    value = 10
  []
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    app_type = MooseTestApp
    input_files = 'source_boundary_sub.i'
    positions = '-1.0 0.0 0.0
                  2. 0.0 0.0'
    output_in_position = true
    cli_args='BCs/right/value="1" BCs/right/value="10"'
  []
[]

[Transfers]
  [source_boundary]
    type = MultiAppNearestNodeTransfer
    source_variable = u
    direction = from_multiapp
    multi_app = sub
    variable = from_sub
    source_boundary = 'right'
  []
[]

[Executioner]
  type = Steady
  nl_rel_tol = 1e-6
[]

[Outputs]
  exodus = true
[]

(test/tests/transfers/multiapp_copy_transfer/constant_monomial_from_sub/master.i)

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

[Variables]
  [./u]
    family = MONOMIAL
    order = CONSTANT
  [../]
[]

[Problem]
  type = FEProblem
  solve = false
[]

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

[MultiApps]
  [./sub]
    type = FullSolveMultiApp
    input_files = sub.i
    execute_on = initial
  [../]
[]

[Transfers]
  [./from_sub]
    type = MultiAppCopyTransfer
    direction = from_multiapp
    source_variable = aux
    variable = u
    multi_app = sub
  [../]
[]

[Outputs]
  exodus = true
[]

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

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

[AuxVariables]
  [Tf]
  []
[]

[Variables]
  [power_density]
  []
[]

[Functions]
  [pwr_func]
    type = ParsedFunction
    value = '1e3*x*(1-x)+5e2'
  []
[]

[Kernels]
  [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
    variable = power_density
    execute_on = 'initial timestep_end'
  []
  [temp_avg]
    type = ElementAverageValue
    variable = Tf
    execute_on = 'initial final'
  []
  [temp_max]
    type = ElementExtremeValue
    value_type = max
    variable = Tf
    execute_on = 'initial final'
  []
  [temp_min]
    type = ElementExtremeValue
    value_type = min
    variable = Tf
    execute_on = 'initial final'
  []
[]

[Executioner]
  type = Steady
  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

  fixed_point_rel_tol = 1E-7
  fixed_point_abs_tol = 1.0e-07
  fixed_point_max_its = 12
[]

[MultiApps]
  [sub]
    type = FullSolveMultiApp
    app_type = MooseTestApp
    positions = '0 0 0'
    input_files  = steady_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
  checkpoint = true
  execute_on = 'INITIAL TIMESTEP_END FINAL'
[]

(modules/stochastic_tools/include/multiapps/SamplerFullSolveMultiApp.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 "FullSolveMultiApp.h"
#include "SamplerInterface.h"

#include "StochasticToolsTypes.h"

class Sampler;
class StochasticToolsTransfer;

class SamplerFullSolveMultiApp : public FullSolveMultiApp, public SamplerInterface
{
public:
  static InputParameters validParams();
  SamplerFullSolveMultiApp(const InputParameters & parameters);
  virtual bool solveStep(Real dt, Real target_time, bool auto_advance = true) override;
  virtual void preTransfer(Real dt, Real target_time) 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 for batch mode 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.
   */
  std::vector<std::shared_ptr<StochasticToolsTransfer>>
  getActiveStochasticToolsTransfers(Transfer::DIRECTION direction);

  // Flag indicating a solve has occured
  bool _solved_once;

  // Sampler size, to test if the MultiApp object needs to be re-initialize
  dof_id_type _number_of_sampler_rows;

  /// 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();
};

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