NormalNodalMechanicalContact

Similar to the NormalMortarMechanicalContact object except the contact forces are applied through a node-face geometric discretization as opposed to a mortar discretization. Some numerical experiments show that non-linear solve convergence with the node-face discretization for contact forces is comparable or only slightly worse than the mortar application.

!syntax description /Constraints/NormalNodalMechanicalContact

Input Parameters

componentThe force component constraint that this object is supplying
C++ Type:MooseEnum
Options:x y z
Description:The force component constraint that this object is supplying
lambdaThe normal lagrange multiplier
C++ Type:std::vector
Options:
Description:The normal lagrange multiplier
masterThe boundary ID associated with the master side
C++ Type:BoundaryName
Options:
Description:The boundary ID associated with the master side
master_variableThe variable on the master side of the domain
C++ Type:std::vector
Options:
Description:The variable on the master side of the domain
slaveThe boundary ID associated with the slave side
C++ Type:BoundaryName
Options:
Description:The boundary ID associated with the slave side
variableThe name of the variable that this constraint is applied to.
C++ Type:NonlinearVariableName
Options:
Description:The name of the variable that this constraint is applied to.

Required Parameters

execute_onLINEARThe 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:LINEAR
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.
normal_smoothing_distanceDistance from edge in parametric coordinates over which to smooth contact normal
C++ Type:double
Options:
Description:Distance from edge in parametric coordinates over which to smooth contact normal
normal_smoothing_methodMethod to use to smooth normals (edge_based|nodal_normal_based)
C++ Type:std::string
Options:
Description:Method to use to smooth normals (edge_based|nodal_normal_based)
orderFIRSTThe finite element order used for projections
Default:FIRST
C++ Type:MooseEnum
Options:FIRST SECOND THIRD FOURTH
Description:The finite element order used for projections
tangential_toleranceTangential distance to extend edges of contact surfaces
C++ Type:double
Options:
Description:Tangential distance to extend edges of contact surfaces

Optional Parameters

control_tagsAdds user-defined labels for accessing object parameters via control logic.
C++ Type:std::vector
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_meshTrueWhether 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:True
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

extra_matrix_tagsThe extra tags for the matrices this Kernel should fill
C++ Type:std::vector
Options:
Description:The extra tags for the matrices this Kernel should fill
extra_vector_tagsThe extra tags for the vectors this Kernel should fill
C++ Type:std::vector
Options:
Description:The extra tags for the vectors this Kernel should fill
matrix_tagssystemThe tag for the matrices this Kernel should fill
Default:system
C++ Type:MultiMooseEnum
Options:nontime system
Description:The tag for the matrices this Kernel should fill
vector_tagsnontimeThe tag for the vectors this Kernel should fill
Default:nontime
C++ Type:MultiMooseEnum
Options:nontime time
Description:The tag for the vectors this Kernel should fill

Tagging Parameters

Input Files

modules/contact/test/tests/bouncing-block-contact/frictionless-nodal-fb-lm-nodal-disp.i
modules/contact/test/tests/bouncing-block-contact/frictionless-nodal-min-lm-nodal-disp.i

modules/contact/test/tests/bouncing-block-contact/frictionless-nodal-fb-lm-nodal-disp.i

starting_point = 2e-1
offset = 1e-2

[GlobalParams]
  displacements = 'disp_x disp_y'
  diffusivity = 1e0
  scaling = 1e0
[]

[Mesh]
  file = long-bottom-block-1elem-blocks.e
[]

[Problem]
  kernel_coverage_check = false
[]

[Variables]
  [./disp_x]
    block = '1 2'
  [../]
  [./disp_y]
    block = '1 2'
  [../]
  [./normal_lm]
    block = 3
  [../]
[]

[ICs]
  [./disp_y]
    block = 2
    variable = disp_y
    value = ${fparse starting_point + offset}
    type = ConstantIC
  [../]
[]

[Kernels]
  [./disp_x]
    type = MatDiffusion
    variable = disp_x
  [../]
  [./disp_y]
    type = MatDiffusion
    variable = disp_y
  [../]
[]


[Constraints]
  [./lm]
    type = NormalNodalLMMechanicalContact
    slave = 10
    master = 20
    variable = normal_lm
    master_variable = disp_x
    disp_y = disp_y
    ncp_function_type = 'fb'
  [../]
  [./disp_x]
    type = NormalNodalMechanicalContact
    slave = 10
    master = 20
    variable = disp_x
    master_variable = disp_x
    lambda = normal_lm
    component = x
  [../]
  [./disp_y]
    type = NormalNodalMechanicalContact
    slave = 10
    master = 20
    variable = disp_y
    master_variable = disp_y
    lambda = normal_lm
    component = y
  [../]
[]

[BCs]
  [./botx]
    type = DirichletBC
    variable = disp_x
    preset = false
    boundary = 40
    value = 0.0
  [../]
  [./boty]
    type = DirichletBC
    variable = disp_y
    preset = false
    boundary = 40
    value = 0.0
  [../]
  [./topy]
    type = FunctionDirichletBC
    variable = disp_y
    preset = false
    boundary = 30
    function = '${starting_point} * cos(2 * pi / 40 * t) + ${offset}'
  [../]
  [./leftx]
    type = FunctionDirichletBC
    variable = disp_x
    preset = false
    boundary = 50
    function = '1e-2 * t'
  [../]
[]

[Executioner]
  type = Transient
  end_time = 200
  dt = 5
  dtmin = .1
  solve_type = 'PJFNK'
  petsc_options = '-snes_converged_reason -ksp_converged_reason -pc_svd_monitor -snes_linesearch_monitor'
  petsc_options_iname = '-pc_type -pc_factor_shift_type -pc_factor_shift_amount -mat_mffd_err'
  petsc_options_value = 'lu       NONZERO               1e-15                   1e-5'
  l_max_its = 30
  nl_max_its = 20
  line_search = 'none'
[]

[Debug]
  show_var_residual_norms = true
[]

[Outputs]
  exodus = true
[]

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

[Postprocessors]
  active = 'num_nl cumulative contact'
  [./num_nl]
    type = NumNonlinearIterations
  [../]
  [./cumulative]
    type = CumulativeValuePostprocessor
    postprocessor = num_nl
  [../]
  [contact]
    type = ContactDOFSetSize
    variable = normal_lm
    subdomain = '3'
    execute_on = 'nonlinear timestep_end'
  []
[]

modules/contact/test/tests/bouncing-block-contact/frictionless-nodal-min-lm-nodal-disp.i

starting_point = 2e-1
offset = 1e-2

[GlobalParams]
  displacements = 'disp_x disp_y'
  diffusivity = 1e0
  scaling = 1e0
[]

[Mesh]
  file = long-bottom-block-1elem-blocks.e
[]

[Problem]
  kernel_coverage_check = false
[]

[Variables]
  [./disp_x]
    block = '1 2'
  [../]
  [./disp_y]
    block = '1 2'
  [../]
  [./normal_lm]
    block = 3
  [../]
[]

[ICs]
  [./disp_y]
    block = 2
    variable = disp_y
    value = ${fparse starting_point + offset}
    type = ConstantIC
  [../]
[]

[Kernels]
  [./disp_x]
    type = MatDiffusion
    variable = disp_x
  [../]
  [./disp_y]
    type = MatDiffusion
    variable = disp_y
  [../]
[]


[Constraints]
  [./lm]
    type = NormalNodalLMMechanicalContact
    slave = 10
    master = 20
    variable = normal_lm
    master_variable = disp_x
    disp_y = disp_y
  [../]
  [./disp_x]
    type = NormalNodalMechanicalContact
    slave = 10
    master = 20
    variable = disp_x
    master_variable = disp_x
    lambda = normal_lm
    component = x
  [../]
  [./disp_y]
    type = NormalNodalMechanicalContact
    slave = 10
    master = 20
    variable = disp_y
    master_variable = disp_y
    lambda = normal_lm
    component = y
  [../]
[]

[BCs]
  [./botx]
    type = DirichletBC
    variable = disp_x
    boundary = 40
    value = 0.0
  [../]
  [./boty]
    type = DirichletBC
    variable = disp_y
    boundary = 40
    value = 0.0
  [../]
  [./topy]
    type = FunctionDirichletBC
    variable = disp_y
    boundary = 30
    function = '${starting_point} * cos(2 * pi / 40 * t) + ${offset}'
  [../]
  [./leftx]
    type = FunctionDirichletBC
    variable = disp_x
    boundary = 50
    function = '1e-2 * t'
  [../]
[]

[Executioner]
  type = Transient
  end_time = 200
  dt = 5
  dtmin = .1
  solve_type = 'PJFNK'
  petsc_options = '-snes_converged_reason -ksp_converged_reason -pc_svd_monitor -snes_linesearch_monitor'
  petsc_options_iname = '-pc_type -pc_factor_shift_type -pc_factor_shift_amount -mat_mffd_err'
  petsc_options_value = 'lu       NONZERO               1e-15                   1e-5'
  l_max_its = 30
  nl_max_its = 20
  line_search = 'none'
[]

[Debug]
  show_var_residual_norms = true
[]

[Outputs]
  exodus = true
  [dof]
    type = DOFMap
    execute_on = 'initial'
  []
[]

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

[Postprocessors]
  active = 'num_nl cumulative contact'
  [./num_nl]
    type = NumNonlinearIterations
  [../]
  [./cumulative]
    type = CumulativeValuePostprocessor
    postprocessor = num_nl
  [../]
  [contact]
    type = ContactDOFSetSize
    variable = normal_lm
    subdomain = '3'
    execute_on = 'nonlinear timestep_end'
  []
[]

References

Input Parameters
Input Files
References

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