CutElementSubdomainModifier

Change element subdomain based on CutSubdomainID

Overview

CutElementSubdomainModifier switches the element subdomain ID based on the CutSubdomainID marked by geometric cut userobjects. This object extends the capabilities described in CoupledVarThresholdElementSubdomainModifier to allow subdomains to be defined based on XFEM interfaces.

Example Input File Syntax

[UserObjects]
  [level_set_cut_uo]
    type = LevelSetCutUserObject
    level_set_var = ls
    heal_always = true
  []
  [esm]
    type = CutElementSubdomainModifier
    geometric_cut_userobject = level_set_cut_uo
    apply_initial_conditions = false
  []
[]

Input Parameters

geometric_cut_userobjectThe geometric cut userobject that assigns the CutSubdomainID
C++ Type:UserObjectName
Options:
Description:The geometric cut userobject that assigns the CutSubdomainID

Required Parameters

apply_initial_conditionsTrueWhether to apply initial conditions on the moved nodes and elements
Default:True
C++ Type:bool
Options:
Description:Whether to apply initial conditions on the moved nodes and elements
blockThe list of block ids (SubdomainID) that this object will be applied
C++ Type:std::vector<SubdomainName>
Options:
Description:The list of block ids (SubdomainID) that this object will be applied
execute_onTIMESTEP_ENDThe 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_END
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.
moving_boundary_nameBoundary to modify when an element is moved. A boundary with the provided name will be created if not already exists on the mesh.
C++ Type:BoundaryName
Options:
Description:Boundary to modify when an element is moved. A boundary with the provided name will be created if not already exists on the mesh.

Optional Parameters

allow_duplicate_execution_on_initialFalseIn the case where this UserObject is depended upon by an initial condition, allow it to be executed twice during the initial setup (once before the IC and again after mesh adaptivity (if applicable).
Default:False
C++ Type:bool
Options:
Description:In the case where this UserObject is depended upon by an initial condition, allow it to be executed twice during the initial setup (once before the IC and again after mesh adaptivity (if applicable).
control_tagsAdds user-defined labels for accessing object parameters via control logic.
C++ Type:std::vector<std::string>
Options:
Description:Adds user-defined labels for accessing object parameters via control logic.
enableTrueSet the enabled status of the MooseObject.
Default:True
C++ Type:bool
Options:
Description:Set the enabled status of the MooseObject.
implicitTrueDetermines whether this object is calculated using an implicit or explicit form
Default:True
C++ Type:bool
Options:
Description:Determines whether this object is calculated using an implicit or explicit form
seed0The seed for the master random number generator
Default:0
C++ Type:unsigned int
Options:
Description:The seed for the master random number generator

Advanced Parameters

Input Files

(modules/xfem/test/tests/moving_interface/moving_bimaterial_finite_strain_esm.i)

(modules/xfem/test/tests/moving_interface/moving_bimaterial_finite_strain_esm.i)

# This test is for two layer materials with different youngs modulus with AD
# The global stress is determined by switching the stress based on level set values
# The material interface is marked by a level set function
# The two layer materials are glued together

[GlobalParams]
  displacements = 'disp_x disp_y'
[]

[XFEM]
  output_cut_plane = true
[]

[UserObjects]
  [level_set_cut_uo]
    type = LevelSetCutUserObject
    level_set_var = ls
    heal_always = true
  []
  [esm]
    type = CutElementSubdomainModifier
    geometric_cut_userobject = level_set_cut_uo
    apply_initial_conditions = false
  []
[]

[Mesh]
  use_displaced_mesh = true
  [generated_mesh]
    type = GeneratedMeshGenerator
    dim = 2
    nx = 10
    ny = 10
    xmin = 0
    xmax = 5
    ymin = 0
    ymax = 5
    elem_type = QUAD4
  []
  [bottom]
    type = SubdomainBoundingBoxGenerator
    input = generated_mesh
    block_id = 0
    bottom_left = '0 0 0'
    top_right = '5 2.5 0'
  []
  [top]
    type = SubdomainBoundingBoxGenerator
    input = bottom
    block_id = 1
    bottom_left = '0 2.5 0'
    top_right = '5 5 0'
  []
[]

[Functions]
  [ls_func]
    type = ParsedFunction
    value = 'y-2.73+t'
  []
[]

[Variables]
  [disp_x]
  []
  [disp_y]
  []
[]

[AuxVariables]
  [ls]
  []
  [strain_xx]
    order = CONSTANT
    family = MONOMIAL
  []
  [strain_yy]
    order = CONSTANT
    family = MONOMIAL
  []
  [strain_xy]
    order = CONSTANT
    family = MONOMIAL
  []
  [stress_xx]
    order = CONSTANT
    family = MONOMIAL
  []
  [stress_yy]
    order = CONSTANT
    family = MONOMIAL
  []
  [stress_xy]
    order = CONSTANT
    family = MONOMIAL
  []
[]

[AuxKernels]
  [ls_function]
    type = FunctionAux
    variable = ls
    function = ls_func
  []
  [strain_xx]
    type = RankTwoAux
    variable = strain_xx
    rank_two_tensor = total_strain
    index_i = 0
    index_j = 0
  []
  [strain_yy]
    type = RankTwoAux
    variable = strain_yy
    rank_two_tensor = total_strain
    index_i = 1
    index_j = 1
  []
  [strain_xy]
    type = RankTwoAux
    variable = strain_xy
    rank_two_tensor = total_strain
    index_i = 0
    index_j = 1
  []
  [stress_xx]
    type = RankTwoAux
    variable = stress_xx
    rank_two_tensor = stress
    index_i = 0
    index_j = 0
  []
  [stress_xy]
    type = RankTwoAux
    variable = stress_xy
    rank_two_tensor = stress
    index_i = 0
    index_j = 1
  []
  [stress_yy]
    type = RankTwoAux
    variable = stress_yy
    rank_two_tensor = stress
    index_i = 1
    index_j = 1
  []
[]

[Kernels]
  [solid_x]
    type = StressDivergenceTensors
    variable = disp_x
    component = 0
    use_displaced_mesh = true
  []
  [solid_y]
    type = StressDivergenceTensors
    variable = disp_y
    component = 1
    use_displaced_mesh = true
  []
[]

[Constraints]
  [dispx_constraint]
    type = XFEMSingleVariableConstraint
    use_displaced_mesh = false
    variable = disp_x
    alpha = 1e8
    geometric_cut_userobject = 'level_set_cut_uo'
  []
  [dispy_constraint]
    type = XFEMSingleVariableConstraint
    use_displaced_mesh = false
    variable = disp_y
    alpha = 1e8
    geometric_cut_userobject = 'level_set_cut_uo'
  []
[]

[BCs]
  [bottomx]
    type = DirichletBC
    boundary = bottom
    variable = disp_x
    value = 0.0
  []
  [bottomy]
    type = DirichletBC
    boundary = bottom
    variable = disp_y
    value = 0.0
  []
  [topx]
    type = FunctionDirichletBC
    boundary = top
    variable = disp_x
    function = 0.03*t
  []
  [topy]
    type = FunctionDirichletBC
    boundary = top
    variable = disp_y
    function = '0.03*t'
  []
[]

[Materials]
  [elasticity_tensor_A]
    type = ComputeIsotropicElasticityTensor
    block = 1
    youngs_modulus = 1e9
    poissons_ratio = 0.3
  []
  [strain_A]
    type = ComputeFiniteStrain
    block = 1
  []
  [stress_A]
    type = ComputeFiniteStrainElasticStress
    block = 1
  []
  [elasticity_tensor_B]
    type = ComputeIsotropicElasticityTensor
    block = 0
    youngs_modulus = 1e7
    poissons_ratio = 0.3
  []
  [strain_B]
    type = ComputeFiniteStrain
    block = 0
  []
  [stress_B]
    type = ComputeFiniteStrainElasticStress
    block = 0
  []
[]

[Postprocessors]
  [disp_x_norm]
    type = ElementL2Norm
    variable = disp_x
  []
  [disp_y_norm]
    type = ElementL2Norm
    variable = disp_y
  []
[]

[Executioner]
  type = Transient

  solve_type = NEWTON
  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'
  automatic_scaling = true

  # controls for nonlinear iterations
  nl_max_its = 15
  nl_rel_tol = 1e-13
  nl_abs_tol = 1e-50

  # time control
  start_time = 0.0
  dt = 0.1
  num_steps = 4

  max_xfem_update = 1
[]

[Outputs]
  print_linear_residuals = false
  exodus = true
[]

(modules/xfem/test/tests/moving_interface/moving_bimaterial_finite_strain_esm.i)

# This test is for two layer materials with different youngs modulus with AD
# The global stress is determined by switching the stress based on level set values
# The material interface is marked by a level set function
# The two layer materials are glued together

[GlobalParams]
  displacements = 'disp_x disp_y'
[]

[XFEM]
  output_cut_plane = true
[]

[UserObjects]
  [level_set_cut_uo]
    type = LevelSetCutUserObject
    level_set_var = ls
    heal_always = true
  []
  [esm]
    type = CutElementSubdomainModifier
    geometric_cut_userobject = level_set_cut_uo
    apply_initial_conditions = false
  []
[]

[Mesh]
  use_displaced_mesh = true
  [generated_mesh]
    type = GeneratedMeshGenerator
    dim = 2
    nx = 10
    ny = 10
    xmin = 0
    xmax = 5
    ymin = 0
    ymax = 5
    elem_type = QUAD4
  []
  [bottom]
    type = SubdomainBoundingBoxGenerator
    input = generated_mesh
    block_id = 0
    bottom_left = '0 0 0'
    top_right = '5 2.5 0'
  []
  [top]
    type = SubdomainBoundingBoxGenerator
    input = bottom
    block_id = 1
    bottom_left = '0 2.5 0'
    top_right = '5 5 0'
  []
[]

[Functions]
  [ls_func]
    type = ParsedFunction
    value = 'y-2.73+t'
  []
[]

[Variables]
  [disp_x]
  []
  [disp_y]
  []
[]

[AuxVariables]
  [ls]
  []
  [strain_xx]
    order = CONSTANT
    family = MONOMIAL
  []
  [strain_yy]
    order = CONSTANT
    family = MONOMIAL
  []
  [strain_xy]
    order = CONSTANT
    family = MONOMIAL
  []
  [stress_xx]
    order = CONSTANT
    family = MONOMIAL
  []
  [stress_yy]
    order = CONSTANT
    family = MONOMIAL
  []
  [stress_xy]
    order = CONSTANT
    family = MONOMIAL
  []
[]

[AuxKernels]
  [ls_function]
    type = FunctionAux
    variable = ls
    function = ls_func
  []
  [strain_xx]
    type = RankTwoAux
    variable = strain_xx
    rank_two_tensor = total_strain
    index_i = 0
    index_j = 0
  []
  [strain_yy]
    type = RankTwoAux
    variable = strain_yy
    rank_two_tensor = total_strain
    index_i = 1
    index_j = 1
  []
  [strain_xy]
    type = RankTwoAux
    variable = strain_xy
    rank_two_tensor = total_strain
    index_i = 0
    index_j = 1
  []
  [stress_xx]
    type = RankTwoAux
    variable = stress_xx
    rank_two_tensor = stress
    index_i = 0
    index_j = 0
  []
  [stress_xy]
    type = RankTwoAux
    variable = stress_xy
    rank_two_tensor = stress
    index_i = 0
    index_j = 1
  []
  [stress_yy]
    type = RankTwoAux
    variable = stress_yy
    rank_two_tensor = stress
    index_i = 1
    index_j = 1
  []
[]

[Kernels]
  [solid_x]
    type = StressDivergenceTensors
    variable = disp_x
    component = 0
    use_displaced_mesh = true
  []
  [solid_y]
    type = StressDivergenceTensors
    variable = disp_y
    component = 1
    use_displaced_mesh = true
  []
[]

[Constraints]
  [dispx_constraint]
    type = XFEMSingleVariableConstraint
    use_displaced_mesh = false
    variable = disp_x
    alpha = 1e8
    geometric_cut_userobject = 'level_set_cut_uo'
  []
  [dispy_constraint]
    type = XFEMSingleVariableConstraint
    use_displaced_mesh = false
    variable = disp_y
    alpha = 1e8
    geometric_cut_userobject = 'level_set_cut_uo'
  []
[]

[BCs]
  [bottomx]
    type = DirichletBC
    boundary = bottom
    variable = disp_x
    value = 0.0
  []
  [bottomy]
    type = DirichletBC
    boundary = bottom
    variable = disp_y
    value = 0.0
  []
  [topx]
    type = FunctionDirichletBC
    boundary = top
    variable = disp_x
    function = 0.03*t
  []
  [topy]
    type = FunctionDirichletBC
    boundary = top
    variable = disp_y
    function = '0.03*t'
  []
[]

[Materials]
  [elasticity_tensor_A]
    type = ComputeIsotropicElasticityTensor
    block = 1
    youngs_modulus = 1e9
    poissons_ratio = 0.3
  []
  [strain_A]
    type = ComputeFiniteStrain
    block = 1
  []
  [stress_A]
    type = ComputeFiniteStrainElasticStress
    block = 1
  []
  [elasticity_tensor_B]
    type = ComputeIsotropicElasticityTensor
    block = 0
    youngs_modulus = 1e7
    poissons_ratio = 0.3
  []
  [strain_B]
    type = ComputeFiniteStrain
    block = 0
  []
  [stress_B]
    type = ComputeFiniteStrainElasticStress
    block = 0
  []
[]

[Postprocessors]
  [disp_x_norm]
    type = ElementL2Norm
    variable = disp_x
  []
  [disp_y_norm]
    type = ElementL2Norm
    variable = disp_y
  []
[]

[Executioner]
  type = Transient

  solve_type = NEWTON
  petsc_options_iname = '-pc_type'
  petsc_options_value = 'lu'
  automatic_scaling = true

  # controls for nonlinear iterations
  nl_max_its = 15
  nl_rel_tol = 1e-13
  nl_abs_tol = 1e-50

  # time control
  start_time = 0.0
  dt = 0.1
  num_steps = 4

  max_xfem_update = 1
[]

[Outputs]
  print_linear_residuals = false
  exodus = true
[]

Overview
Example Input File Syntax
Input Parameters
Input Files

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