MFEMDiffusionKernel.C

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//* This file is part of the MOOSE framework
//* https://mooseframework.inl.gov
//*
//* All rights reserved, see COPYRIGHT for full restrictions
//* https://github.com/idaholab/moose/blob/master/COPYRIGHT
//*
//* Licensed under LGPL 2.1, please see LICENSE for details
//* https://www.gnu.org/licenses/lgpl-2.1.html

#ifdef MOOSE_MFEM_ENABLED

#include "MFEMDiffusionKernel.h"
#include "MFEMProblem.h"

registerMooseObject("MooseApp", MFEMDiffusionKernel);

InputParameters
MFEMDiffusionKernel::validParams()
{
  InputParameters params = MFEMKernel::validParams();
  params.addClassDescription("Adds the domain integrator to an MFEM problem for the bilinear form "
                             "$(k\\vec\\nabla u, \\vec\\nabla v)_\\Omega$ "
                             "arising from the weak form of the Laplacian operator "
                             "$- \\vec\\nabla \\cdot \\left( k \\vec \\nabla u \\right)$.");
  params.addParam<MFEMScalarCoefficientName>(
      "coefficient", "1.", "Name of property for diffusion coefficient k.");
  return params;
}

MFEMDiffusionKernel::MFEMDiffusionKernel(const InputParameters & parameters)
  : MFEMKernel(parameters), _coef(getScalarCoefficient("coefficient"))
// FIXME: The MFEM bilinear form can also handle vector and matrix
// coefficients, so ideally we'd handle all three too.
{
}

mfem::BilinearFormIntegrator *
MFEMDiffusionKernel::createBFIntegrator()
{
  return new mfem::DiffusionIntegrator(_coef);
}

#endif