SetMeshFESpaceAction

Summary

Sets the nodal mesh FESpace to use the same FESpace as the MFEMVariable used to describe node displacements.

Overview

Action called to set the nodal mesh FESpace to use the same FESpace as the variable used to describe node displacements in problems involving deformed meshes, parsing content inside the Mesh block in the user input. Only has an effect if the Problem type is set to MFEMProblem, the Mesh type is set to MFEMMesh and the displacement field is set.

Example Input File Syntax

[Mesh]
  type = MFEMMesh
  file = gold/beam-tet.mesh
  dim = 3
  uniform_refine = 2
  displacement = "displacement"
[]

(test/tests/kernels/linearelasticity.i)

[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
  []
[]

Summary
Overview
Example Input File Syntax