MFEMValueSamplerBase.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 "MFEMVectorPostprocessor.h"

/*
 * MFEM Postprocessor which samples values at points.
 *
 * Subclasses should override validParams and provide and use the constructor.
 */
class MFEMValueSamplerBase : public MFEMVectorPostprocessor
{
public:
  static InputParameters validParams();

  MFEMValueSamplerBase(const InputParameters & parameters, const std::vector<Point> & points);

  virtual void execute() override;

  virtual void finalize() override;

private:
  const VariableName & _var_name;
  const mfem::GridFunction & _var;
  mfem::ParMesh & _mesh;

  mfem::FindPointsGSLIB _finder;
  mfem::Ordering::Type _points_ordering;
  mfem::Vector _points;
  mfem::Vector _interp_vals;

  // VectorPostprocessor declared values - the values written to these are output
  std::vector<std::reference_wrapper<VectorPostprocessorValue>> _declared_points;
  std::vector<std::reference_wrapper<VectorPostprocessorValue>> _declared_vals;
};

#endif // MOOSE_MFEM_ENABLED