- blockThe list of blocks (ids) that this object will be applied to. Leave empty to apply to all blocks.
C++ Type:std::vector<SubdomainName>
Controllable:No
Description:The list of blocks (ids) that this object will be applied to. Leave empty to apply to all blocks.
- lambdaName of MFEM Lame constant lambda to multiply the div(u)*I term by. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number.
C++ Type:MooseFunctorName
Unit:(no unit assumed)
Controllable:No
Description:Name of MFEM Lame constant lambda to multiply the div(u)*I term by. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number.
- muName of MFEM Lame constant mu to multiply the gradients term by. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number.
C++ Type:MooseFunctorName
Unit:(no unit assumed)
Controllable:No
Description:Name of MFEM Lame constant mu to multiply the gradients term by. A functor is any of the following: a variable, a functor material property, a function, a post-processor, or a number.
- variableVariable labelling the weak form this kernel is added to
C++ Type:std::string
Controllable:No
Description:Variable labelling the weak form this kernel is added to
MFEMLinearElasticityKernel
Summary
The isotropic linear elasticity operator with weak form , to be added to an MFEM problem, where is the isotropic elasticity tensor, , is the first Lamé parameter, , is the second Lamé parameter, , where is Young's modulus and is Poisson's ratio.
Overview
Adds the domain integrator for integrating the bilinear form
where , and is the stress tensor of a material with an isotropic stress/strain relation, with components given by
and
noting that the Einstein summation convention has been used throughout.
The two material-dependent Lamé parameters and can be expressed in terms of the material Young's modulus and the Poisson ratio using
Example Input File Syntax
[Mesh]
type = MFEMMesh
file = gold/beam-tet.mesh
dim = 3
uniform_refine = 2
displacement = "displacement"
[]
[Problem]
type = MFEMProblem
[]
[FESpaces]
[H1FESpace]
type = MFEMVectorFESpace
fec_type = H1
fec_order = FIRST
range_dim = 3
ordering = "vdim"
[]
[]
[Variables]
[displacement]
type = MFEMVariable
fespace = H1FESpace
[]
[]
[BCs]
[dirichlet]
type = MFEMVectorDirichletBC
variable = displacement
boundary = '1'
values = '0.0 0.0 0.0'
[]
[pull_down]
type = MFEMVectorBoundaryIntegratedBC
variable = displacement
boundary = '2'
values = '0.0 0.0 -0.01'
[]
[]
[Materials]
[Rigidium]
type = MFEMGenericConstantMaterial
prop_names = 'lambda mu'
prop_values = '50.0 50.0'
block = 1
[]
[Bendium]
type = MFEMGenericConstantMaterial
prop_names = 'lambda mu'
prop_values = '1.0 1.0'
block = 2
[]
[]
[Kernels]
[diff]
type = MFEMLinearElasticityKernel
variable = displacement
lambda = lambda
mu = mu
[]
[]
[Preconditioner]
[boomeramg]
type = MFEMHypreBoomerAMG
l_max_its = 500
l_tol = 1e-8
print_level = 2
[]
[]
[Solver]
type = MFEMHyprePCG
#preconditioner = boomeramg
l_max_its = 5000
l_tol = 1e-8
l_abs_tol = 0.0
print_level = 2
[]
[Executioner]
type = MFEMSteady
device = "cpu"
[]
[Outputs]
[ParaViewDataCollection]
type = MFEMParaViewDataCollection
file_base = OutputData/LinearElasticity
vtk_format = ASCII
[]
[]
Input 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
Controllable:No
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).
- execute_onTIMESTEP_ENDThe list of flag(s) indicating when this object should be executed. For a description of each flag, see https://mooseframework.inl.gov/source/interfaces/SetupInterface.html.
Default:TIMESTEP_END
C++ Type:ExecFlagEnum
Controllable:No
Description:The list of flag(s) indicating when this object should be executed. For a description of each flag, see https://mooseframework.inl.gov/source/interfaces/SetupInterface.html.
- execution_order_group0Execution order groups are executed in increasing order (e.g., the lowest number is executed first). Note that negative group numbers may be used to execute groups before the default (0) group. Please refer to the user object documentation for ordering of user object execution within a group.
Default:0
C++ Type:int
Controllable:No
Description:Execution order groups are executed in increasing order (e.g., the lowest number is executed first). Note that negative group numbers may be used to execute groups before the default (0) group. Please refer to the user object documentation for ordering of user object execution within a group.
- force_postauxFalseForces the UserObject to be executed in POSTAUX
Default:False
C++ Type:bool
Controllable:No
Description:Forces the UserObject to be executed in POSTAUX
- force_preauxFalseForces the UserObject to be executed in PREAUX
Default:False
C++ Type:bool
Controllable:No
Description:Forces the UserObject to be executed in PREAUX
- force_preicFalseForces the UserObject to be executed in PREIC during initial setup
Default:False
C++ Type:bool
Controllable:No
Description:Forces the UserObject to be executed in PREIC during initial setup
Execution Scheduling Parameters
- control_tagsAdds user-defined labels for accessing object parameters via control logic.
C++ Type:std::vector<std::string>
Controllable:No
Description:Adds user-defined labels for accessing object parameters via control logic.
- enableTrueSet the enabled status of the MooseObject.
Default:True
C++ Type:bool
Controllable:Yes
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
Controllable:No
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
- prop_getter_suffixAn optional suffix parameter that can be appended to any attempt to retrieve/get material properties. The suffix will be prepended with a '_' character.
C++ Type:MaterialPropertyName
Unit:(no unit assumed)
Controllable:No
Description:An optional suffix parameter that can be appended to any attempt to retrieve/get material properties. The suffix will be prepended with a '_' character.
- use_interpolated_stateFalseFor the old and older state use projected material properties interpolated at the quadrature points. To set up projection use the ProjectedStatefulMaterialStorageAction.
Default:False
C++ Type:bool
Controllable:No
Description:For the old and older state use projected material properties interpolated at the quadrature points. To set up projection use the ProjectedStatefulMaterialStorageAction.