MFEMWeakFormProblemComposer

Overview

MFEMWeakFormProblemComposer is the builder class for EquationSystemProblemOperator.

Example Input File Syntax

[Problem<<<{"href": "../../../syntax/Problem/index.html"}>>>]
  type = MFEMProblem
[]

[ProblemComposers<<<{"href": "../../../syntax/ProblemComposers/index.html"}>>>]
  [default_steady]
    type = MFEMWeakFormProblemComposer<<<{"description": "Creates a real-valued equation-system problem operator.", "href": "MFEMWeakFormProblemComposer.html"}>>>
  []
[]

Input Parameters

weak_formName of the weak form in the WeakForms block whose equation system this operator solves. May be omitted only if the problem has a single weak form, whose equation system is then used.
C++ Type:MFEMWeakFormName
Controllable:No
Description:Name of the weak form in the WeakForms block whose equation system this operator solves. May be omitted only if the problem has a single weak form, whose equation system is then used.

Optional 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:No
Description:Set the enabled status of the MooseObject.

Advanced Parameters

Input Files

(test/tests/mfem/weakforms/named_weakform.i)
(test/tests/mfem/problemcomposers/explicit_composer_darcy.i)
(test/tests/mfem/problemcomposers/two_problem_composers.i)

(test/tests/mfem/weakforms/named_weakform.i)

!include ../kernels/darcy.i

# Two weak forms are present, so the problem composer and the solver must each name the one
# whose equation system they act on.
[WeakForms]
  [Darcy]
    type = MFEMWeakForm
    kernels = 'VelocityMass PressureGrad VelocityDiv'
    bcs = 'flux_boundaries'
  []
  [VelocityOnly]
    type = MFEMWeakForm
    kernels = 'VelocityMass'
    bcs = 'flux_boundaries'
  []
[]

[ProblemComposers]
  [Darcy]
    type = MFEMWeakFormProblemComposer
    weak_form = Darcy
  []
[]

[Solvers]
  [main]
    weak_form = Darcy
  []
[]

(test/tests/mfem/problemcomposers/two_problem_composers.i)

# Two decoupled Poisson problems on the same mesh, each with its own EquationSystem built by its
# own weak form and solved by its own ProblemOperator. Each problem has constant Dirichlet data on
# every boundary, so the exact solution of each is that constant: u1 == 1 and u2 == 2. The
# postprocessors therefore report zero error only if both operators solve their own system without
# disturbing the other.

[Mesh]
  type = MFEMFileMesh
  file = ../mesh/star.mesh
[]

[Problem]
  type = MFEMProblem
[]

[FESpaces]
  [H1FESpace]
    type = MFEMScalarFESpace
    fec_type = H1
    fec_order = FIRST
  []
[]

[Variables]
  [u1]
    type = MFEMVariable
    fespace = H1FESpace
  []
  [u2]
    type = MFEMVariable
    fespace = H1FESpace
  []
[]

[BCs]
  [u1_boundaries]
    type = MFEMScalarDirichletBC
    variable = u1
    boundary = '1'
    coefficient = 1.0
  []
  [u2_boundaries]
    type = MFEMScalarDirichletBC
    variable = u2
    boundary = '1'
    coefficient = 2.0
  []
[]

[Kernels]
  [diff_u1]
    type = MFEMDiffusionKernel
    variable = u1
  []
  [diff_u2]
    type = MFEMDiffusionKernel
    variable = u2
  []
[]

[WeakForms]
  [FirstSystem]
    type = MFEMWeakForm
    kernels = 'diff_u1'
    bcs = 'u1_boundaries'
  []
  [SecondSystem]
    type = MFEMWeakForm
    kernels = 'diff_u2'
    bcs = 'u2_boundaries'
  []
[]

[ProblemComposers]
  [FirstOperator]
    type = MFEMWeakFormProblemComposer
    weak_form = FirstSystem
  []
  [SecondOperator]
    type = MFEMWeakFormProblemComposer
    weak_form = SecondSystem
  []
[]

[Solvers]
  [main]
    type = MFEMMUMPS
    weak_form = FirstSystem
  []
[]

[Executioner]
  type = MFEMSteady
  device = cpu
[]

[Postprocessors]
  [u1_error]
    type = MFEML2Error
    variable = u1
    function = 1.0
  []
  [u2_error]
    type = MFEML2Error
    variable = u2
    function = 2.0
  []
[]

[Outputs]
  [TwoComposersCSV]
    type = CSV
    file_base = OutputData/TwoProblemComposers
  []
[]

Overview
Example Input File Syntax
Input Parameters
Input Files

MFEMWeakFormProblemComposer

Overview

Example Input File Syntax

Input Parameters

Optional Parameters

Advanced Parameters

Input Files

(test/tests/mfem/problemcomposers/explicit_composer_darcy.i)

(test/tests/mfem/weakforms/named_weakform.i)

(test/tests/mfem/problemcomposers/explicit_composer_darcy.i)

(test/tests/mfem/problemcomposers/two_problem_composers.i)