dg_fem_context.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2025 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner

// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.

// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA



#ifndef LIBMESH_DG_FEM_CONTEXT_H
#define LIBMESH_DG_FEM_CONTEXT_H

// Local Includes
#include "libmesh/fem_context.h"


namespace libMesh
{

class DGFEMContext : public FEMContext
{
public:

  explicit
  DGFEMContext (const System & sys);

  virtual ~DGFEMContext ();

  virtual void side_fe_reinit () override;

  void neighbor_side_fe_reinit ();

  const std::vector<dof_id_type> & get_neighbor_dof_indices() const
  { return _neighbor_dof_indices; }

  const std::vector<dof_id_type> & get_neighbor_dof_indices( unsigned int var ) const
  { return _neighbor_dof_indices_var[var]; }

  const DenseVector<Number> & get_neighbor_residual() const
  { return _neighbor_residual; }

  DenseVector<Number> & get_neighbor_residual()
  { return _neighbor_residual; }

  const DenseSubVector<Number> & get_neighbor_residual( unsigned int var ) const
  { return *(_neighbor_subresiduals[var]); }

  DenseSubVector<Number> & get_neighbor_residual( unsigned int var )
  { return *(_neighbor_subresiduals[var]); }

  const DenseMatrix<Number> & get_elem_elem_jacobian() const
  { return _elem_elem_jacobian; }

  DenseMatrix<Number> & get_elem_elem_jacobian()
  { return _elem_elem_jacobian; }

  const DenseSubMatrix<Number> & get_elem_elem_jacobian( unsigned int var1, unsigned int var2 ) const
  { return *(_elem_elem_subjacobians[var1][var2]); }

  DenseSubMatrix<Number> & get_elem_elem_jacobian( unsigned int var1, unsigned int var2 )
  { return *(_elem_elem_subjacobians[var1][var2]); }

  const DenseMatrix<Number> & get_elem_neighbor_jacobian() const
  { return _elem_neighbor_jacobian; }

  DenseMatrix<Number> & get_elem_neighbor_jacobian()
  { return _elem_neighbor_jacobian; }

  const DenseSubMatrix<Number> & get_elem_neighbor_jacobian( unsigned int var1, unsigned int var2 ) const
  { return *(_elem_neighbor_subjacobians[var1][var2]); }

  DenseSubMatrix<Number> & get_elem_neighbor_jacobian( unsigned int var1, unsigned int var2 )
  { return *(_elem_neighbor_subjacobians[var1][var2]); }

  const DenseMatrix<Number> & get_neighbor_elem_jacobian() const
  { return _neighbor_elem_jacobian; }

  DenseMatrix<Number> & get_neighbor_elem_jacobian()
  { return _neighbor_elem_jacobian; }

  const DenseSubMatrix<Number> & get_neighbor_elem_jacobian( unsigned int var1, unsigned int var2 ) const
  { return *(_neighbor_elem_subjacobians[var1][var2]); }

  DenseSubMatrix<Number> & get_neighbor_elem_jacobian( unsigned int var1, unsigned int var2 )
  { return *(_neighbor_elem_subjacobians[var1][var2]); }

  const DenseMatrix<Number> & get_neighbor_neighbor_jacobian() const
  { return _neighbor_neighbor_jacobian; }

  DenseMatrix<Number> & get_neighbor_neighbor_jacobian()
  { return _neighbor_neighbor_jacobian; }

  const DenseSubMatrix<Number> & get_neighbor_neighbor_jacobian( unsigned int var1, unsigned int var2 ) const
  { return *(_neighbor_neighbor_subjacobians[var1][var2]); }

  DenseSubMatrix<Number> & get_neighbor_neighbor_jacobian( unsigned int var1, unsigned int var2 )
  { return *(_neighbor_neighbor_subjacobians[var1][var2]); }

  void set_neighbor(const Elem & neighbor)
  { _neighbor = &neighbor; }

  const Elem & get_neighbor() const
  { return *_neighbor; }

  bool dg_terms_are_active() const
  { return _dg_terms_active; }

  template<typename OutputShape>
  void get_neighbor_side_fe( unsigned int var, FEGenericBase<OutputShape> *& fe ) const;

private:

  const Elem * _neighbor;

  DenseVector<Number> _neighbor_residual;

  DenseMatrix<Number> _elem_elem_jacobian;
  DenseMatrix<Number> _elem_neighbor_jacobian;
  DenseMatrix<Number> _neighbor_elem_jacobian;
  DenseMatrix<Number> _neighbor_neighbor_jacobian;

  std::vector<std::unique_ptr<DenseSubVector<Number>>> _neighbor_subresiduals;
  std::vector<std::vector<std::unique_ptr<DenseSubMatrix<Number>>>> _elem_elem_subjacobians;
  std::vector<std::vector<std::unique_ptr<DenseSubMatrix<Number>>>> _elem_neighbor_subjacobians;
  std::vector<std::vector<std::unique_ptr<DenseSubMatrix<Number>>>> _neighbor_elem_subjacobians;
  std::vector<std::vector<std::unique_ptr<DenseSubMatrix<Number>>>> _neighbor_neighbor_subjacobians;

  std::vector<dof_id_type> _neighbor_dof_indices;
  std::vector<std::vector<dof_id_type>> _neighbor_dof_indices_var;

  std::map<FEType, std::unique_ptr<FEAbstract>> _neighbor_side_fe;

  std::vector<FEAbstract *> _neighbor_side_fe_var;

  bool _dg_terms_active;
};

template<typename OutputShape>
inline
void DGFEMContext::get_neighbor_side_fe( unsigned int var, FEGenericBase<OutputShape> *& fe ) const
{
  libmesh_assert_less ( var, _neighbor_side_fe_var.size() );
  fe = cast_ptr<FEGenericBase<OutputShape> *>( _neighbor_side_fe_var[var] );
}

} // namespace libMesh

#endif // LIBMESH_FEM_CONTEXT_H