EigenproblemEquationSystem.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 "EquationSystem.h"
 
#include <variant>
 
namespace Moose::MFEM
{
class EigensolverBase;
 
using EigenRHSCoefficient = std::variant<mfem::Coefficient *, mfem::MatrixCoefficient *>;
 
class EigenproblemEquationSystem : public EquationSystem
{
public:
  EigenproblemEquationSystem() = default;
  ~EigenproblemEquationSystem() override = default;
 
  void BuildEigenproblemJacobian(mfem::BlockVector & trueX, EigenRHSCoefficient rhs_coefficient);
 
  void PrepareEigensolver(EigensolverBase & solver);
 
  bool IsEigen() const override { return true; }
 
protected:
  virtual void ApplyEssentialBCs() override;
 
  virtual void CheckProblemIsHomogeneous();
 
  void FormEigenproblemMatrix();
 
  void FormMassMatrix(EigenRHSCoefficient rhs_coefficient);
 
private:
  friend class EigenproblemESProblemOperator;
 
  mfem::OperatorHandle _mass_rhs;
};
 
} // namespace Moose::MFEM
 
#endif