MeshCut3DUserObject

Creates a UserObject for a mesh cutter in 3D problems

Overview

This class: (1) reads in a mesh describing the crack surface, (2) uses the mesh to do initial cutting of 3D elements, and (3) grows the mesh incrementally based on prescribed growth functions. Interfacing with the domain integral methods is needed to grow the surface mesh based on physically determined propagation directions and speeds.

Example Input Syntax

[UserObjects]
  [./cut_mesh]
    type = MeshCut3DUserObject
    mesh_file = mesh_edge_crack.xda
    size_control = 0.1
    n_step_growth = 1
    function_x = growth_func_x
    function_y = growth_func_y
    function_z = growth_func_z
  [../]
[]

Input Parameters

function_xGrowth function for x direction
C++ Type:FunctionName
Options:
Description:Growth function for x direction
function_yGrowth function for y direction
C++ Type:FunctionName
Options:
Description:Growth function for y direction
function_zGrowth function for z direction
C++ Type:FunctionName
Options:
Description:Growth function for z direction
mesh_fileMesh file for the XFEM geometric cut; currently only the xda type is supported
C++ Type:MeshFileName
Options:
Description:Mesh file for the XFEM geometric cut; currently only the xda type is supported

Required Parameters

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_onXFEM_MARKThe 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, XFEM_MARK.
Default:XFEM_MARK
C++ Type:ExecFlagEnum
Options:NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, FINAL, CUSTOM, XFEM_MARK
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, XFEM_MARK.
heal_alwaysFalseHeal previous cuts at every time step
Default:False
C++ Type:bool
Options:
Description:Heal previous cuts at every time step
n_step_growth0Number of steps for crack growth
Default:0
C++ Type:unsigned int
Options:
Description:Number of steps for crack growth
size_control0Criterion for refining elements while growing the crack
Default:0
C++ Type:double
Options:
Description:Criterion for refining elements while growing the crack

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
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/xfem/test/tests/solid_mechanics_basic/mesh_grow.i)
(modules/xfem/test/tests/solid_mechanics_basic/edge_crack_3d_propagation.i)

(modules/xfem/test/tests/solid_mechanics_basic/edge_crack_3d_propagation.i)

[GlobalParams]
  displacements = 'disp_x disp_y disp_z'
  volumetric_locking_correction = true
[]

[XFEM]
  geometric_cut_userobjects = 'cut_mesh'
  qrule = volfrac
  output_cut_plane = true
[]

[Mesh]
  type = GeneratedMesh
  dim = 3
  nx = 5
  ny = 5
  nz = 2
  xmin = 0.0
  xmax = 1.0
  ymin = 0.0
  ymax = 1.0
  zmin = 0.0
  zmax = 0.2
  elem_type = HEX8
[]

[UserObjects]
  [./cut_mesh]
    type = MeshCut3DUserObject
    mesh_file = mesh_edge_crack.xda
    size_control = 0.1
    n_step_growth = 1
    function_x = growth_func_x
    function_y = growth_func_y
    function_z = growth_func_z
  [../]
[]

[Functions]
  [./growth_func_x]
    type = ParsedFunction
    value = 1
  [../]
  [./growth_func_y]
    type = ParsedFunction
    value = 0
  [../]
  [./growth_func_z]
    type = ParsedFunction
    value = 0
  [../]
[]

[Modules/TensorMechanics/Master]
  [./all]
    strain = FINITE
    add_variables = true
    generate_output = 'stress_xx stress_yy stress_zz vonmises_stress'
  [../]
[]

[Functions]
  [./top_trac_y]
    type = ConstantFunction
    value = 10
  [../]
[]


[BCs]
  [./top_y]
    type = FunctionNeumannBC
    boundary = top
    variable = disp_y
    function = top_trac_y
  [../]
  [./bottom_x]
    type = DirichletBC
    boundary = bottom
    variable = disp_x
    value = 0.0
  [../]
  [./bottom_y]
    type = DirichletBC
    boundary = bottom
    variable = disp_y
    value = 0.0
  [../]
  [./bottom_z]
    type = DirichletBC
    boundary = bottom
    variable = disp_z
    value = 0.0
  [../]
[]

[Materials]
  [./elasticity_tensor]
    type = ComputeIsotropicElasticityTensor
    youngs_modulus = 207000
    poissons_ratio = 0.3
    block = 0
  [../]
  [./stress]
    type = ComputeFiniteStrainElasticStress
    block = 0
  [../]
[]

[Executioner]
  type = Transient

  solve_type = 'PJFNK'
  petsc_options_iname = '-ksp_gmres_restart -pc_type -pc_hypre_type -pc_hypre_boomeramg_max_iter'
  petsc_options_value = '201                hypre    boomeramg      8'

  line_search = 'none'

  [./Predictor]
    type = SimplePredictor
    scale = 1.0
  [../]

# controls for linear iterations
  l_max_its = 100
  l_tol = 1e-2

# controls for nonlinear iterations
  nl_max_its = 15
  nl_rel_tol = 1e-12
  nl_abs_tol = 1e-10

# time control
  start_time = 0.0
  dt = 1.0
  end_time = 5.0
  max_xfem_update = 1
[]

[Outputs]
  file_base = edge_crack_3d_propagation_out
  execute_on = 'timestep_end'
  exodus = true
  [./console]
    type = Console
    output_linear = true
  [../]
[]

(modules/xfem/test/tests/solid_mechanics_basic/mesh_grow.i)

[GlobalParams]
  displacements = 'disp_x disp_y disp_z'
  volumetric_locking_correction = true
[]

[XFEM]
  geometric_cut_userobjects = 'cut_mesh'
  output_cut_plane = true
  qrule = volfrac
[]

[Mesh]
  type = GeneratedMesh
  dim = 3
  nx = 5
  ny = 5
  nz = 5
  xmin = 0.0
  xmax = 1.0
  ymin = 0.0
  ymax = 1.0
  zmin = -0.4
  zmax = 0.6
  elem_type = HEX8
[]

[UserObjects]
  [./cut_mesh]
    type = MeshCut3DUserObject
    mesh_file = mesh_grow.xda
    function_x = growth_func_x
    function_y = growth_func_y
    function_z = growth_func_z
# The current gold file does not grow the cutting mesh, but this is something
# that needs to be tested more in the future.
#    size_control = 0.05
#    n_step_growth = 50
  [../]
[]

[Functions]
  [./growth_func_x]
    type = ParsedFunction
    value = 5*(x-0.3)+z
  [../]
  [./growth_func_y]
    type = ParsedFunction
    value = 5*(y-0.5)+(z+x)/2
  [../]
  [./growth_func_z]
    type = ParsedFunction
    value = 5*(z-0.1)+x
  [../]
[]

[Modules/TensorMechanics/Master]
  [./all]
    strain = FINITE
    add_variables = true
    generate_output = 'stress_xx stress_yy stress_zz vonmises_stress'
  [../]
[]

[Functions]
  [./top_trac_y]
    type = ConstantFunction
    value = 10
  [../]
[]


[BCs]
  [./top_y]
    type = FunctionNeumannBC
    boundary = top
    variable = disp_y
    function = top_trac_y
  [../]
  [./bottom_x]
    type = DirichletBC
    boundary = bottom
    variable = disp_x
    value = 0.0
  [../]
  [./bottom_y]
    type = DirichletBC
    boundary = bottom
    variable = disp_y
    value = 0.0
  [../]
  [./bottom_z]
    type = DirichletBC
    boundary = bottom
    variable = disp_z
    value = 0.0
  [../]
[]

[Materials]
  [./elasticity_tensor]
    type = ComputeIsotropicElasticityTensor
    youngs_modulus = 207000
    poissons_ratio = 0.3
  [../]
  [./stress]
    type = ComputeFiniteStrainElasticStress
  [../]
[]

[Executioner]
  type = Transient

  solve_type = 'PJFNK'
  petsc_options_iname = '-ksp_gmres_restart -pc_type -pc_hypre_type -pc_hypre_boomeramg_max_iter'
  petsc_options_value = '201                hypre    boomeramg      8'

  line_search = 'none'

  [./Predictor]
    type = SimplePredictor
    scale = 1.0
  [../]

# controls for linear iterations
  l_max_its = 100
  l_tol = 1e-2

# controls for nonlinear iterations
  nl_max_its = 15
  nl_rel_tol = 1e-12
  nl_abs_tol = 1e-10

# time control
  start_time = 0.0
  dt = 1.0
  end_time = 1.0
[]

[Outputs]
  file_base = mesh_grow
  execute_on = 'timestep_end'
  exodus = true
  [./console]
    type = Console
    output_linear = true
  [../]
[]

(modules/xfem/test/tests/solid_mechanics_basic/edge_crack_3d_propagation.i)

[GlobalParams]
  displacements = 'disp_x disp_y disp_z'
  volumetric_locking_correction = true
[]

[XFEM]
  geometric_cut_userobjects = 'cut_mesh'
  qrule = volfrac
  output_cut_plane = true
[]

[Mesh]
  type = GeneratedMesh
  dim = 3
  nx = 5
  ny = 5
  nz = 2
  xmin = 0.0
  xmax = 1.0
  ymin = 0.0
  ymax = 1.0
  zmin = 0.0
  zmax = 0.2
  elem_type = HEX8
[]

[UserObjects]
  [./cut_mesh]
    type = MeshCut3DUserObject
    mesh_file = mesh_edge_crack.xda
    size_control = 0.1
    n_step_growth = 1
    function_x = growth_func_x
    function_y = growth_func_y
    function_z = growth_func_z
  [../]
[]

[Functions]
  [./growth_func_x]
    type = ParsedFunction
    value = 1
  [../]
  [./growth_func_y]
    type = ParsedFunction
    value = 0
  [../]
  [./growth_func_z]
    type = ParsedFunction
    value = 0
  [../]
[]

[Modules/TensorMechanics/Master]
  [./all]
    strain = FINITE
    add_variables = true
    generate_output = 'stress_xx stress_yy stress_zz vonmises_stress'
  [../]
[]

[Functions]
  [./top_trac_y]
    type = ConstantFunction
    value = 10
  [../]
[]


[BCs]
  [./top_y]
    type = FunctionNeumannBC
    boundary = top
    variable = disp_y
    function = top_trac_y
  [../]
  [./bottom_x]
    type = DirichletBC
    boundary = bottom
    variable = disp_x
    value = 0.0
  [../]
  [./bottom_y]
    type = DirichletBC
    boundary = bottom
    variable = disp_y
    value = 0.0
  [../]
  [./bottom_z]
    type = DirichletBC
    boundary = bottom
    variable = disp_z
    value = 0.0
  [../]
[]

[Materials]
  [./elasticity_tensor]
    type = ComputeIsotropicElasticityTensor
    youngs_modulus = 207000
    poissons_ratio = 0.3
    block = 0
  [../]
  [./stress]
    type = ComputeFiniteStrainElasticStress
    block = 0
  [../]
[]

[Executioner]
  type = Transient

  solve_type = 'PJFNK'
  petsc_options_iname = '-ksp_gmres_restart -pc_type -pc_hypre_type -pc_hypre_boomeramg_max_iter'
  petsc_options_value = '201                hypre    boomeramg      8'

  line_search = 'none'

  [./Predictor]
    type = SimplePredictor
    scale = 1.0
  [../]

# controls for linear iterations
  l_max_its = 100
  l_tol = 1e-2

# controls for nonlinear iterations
  nl_max_its = 15
  nl_rel_tol = 1e-12
  nl_abs_tol = 1e-10

# time control
  start_time = 0.0
  dt = 1.0
  end_time = 5.0
  max_xfem_update = 1
[]

[Outputs]
  file_base = edge_crack_3d_propagation_out
  execute_on = 'timestep_end'
  exodus = true
  [./console]
    type = Console
    output_linear = true
  [../]
[]

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Example Input Syntax
Input Parameters
Input Files

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