MFEMGradAux.h

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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

#pragma once

#include "libmesh/ignore_warnings.h"
#include "mfem/miniapps/common/pfem_extras.hpp"
#include "libmesh/restore_warnings.h"
#include "MFEMAuxKernel.h"

class MFEMGradAux : public MFEMAuxKernel
{
public:
  static InputParameters validParams();

  MFEMGradAux(const InputParameters & parameters);

  virtual ~MFEMGradAux() = default;

  virtual void execute() override;

  // Updates grad operator.
  virtual void update() override;

protected:
  const VariableName _source_var_name;
  const mfem::ParGridFunction & _source_var;
  const mfem::real_t _scale_factor;
  mfem::common::ParDiscreteGradOperator _grad;
};

#endif