fe_raviart_thomas.h

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// ------------------------------------------------------------------------
//
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2003 - 2025 by the deal.II authors
//
// This file is part of the deal.II library.
//
// Part of the source code is dual licensed under Apache-2.0 WITH
// LLVM-exception OR LGPL-2.1-or-later. Detailed license information
// governing the source code and code contributions can be found in
// LICENSE.md and CONTRIBUTING.md at the top level directory of deal.II.
//
// ------------------------------------------------------------------------
 
#ifndef dealii_fe_raviart_thomas_h
#define dealii_fe_raviart_thomas_h
 
#include <deal.II/base/config.h>
 
#include <deal.II/base/mutex.h>
#include <deal.II/base/table.h>
 
#include <deal.II/fe/fe.h>
#include <deal.II/fe/fe_poly_tensor.h>
 
#include <vector>
 
DEAL_II_NAMESPACE_OPEN


template <int dim>
class FE_RaviartThomas : public FE_PolyTensor<dim>
{
public:
  FE_RaviartThomas(const unsigned int p);

  virtual std::string
  get_name() const override;
 
  // documentation inherited from the base class
  virtual std::unique_ptr<FiniteElement<dim, dim>>
  clone() const override;

  static std::vector<unsigned int>
  get_lexicographic_numbering(const unsigned int degree);

  virtual bool
  has_support_on_face(const unsigned int shape_index,
                      const unsigned int face_index) const override;
 
  // documentation inherited from the base class
  virtual void
  convert_generalized_support_point_values_to_dof_values(
    const std::vector<Vector<double>> &support_point_values,
    std::vector<double>               &nodal_values) const override;

  virtual std::pair<Table<2, bool>, std::vector<unsigned int>>
  get_constant_modes() const override;
 
  virtual std::size_t
  memory_consumption() const override;
 
private:
  static std::vector<unsigned int>
  get_dpo_vector(const unsigned int degree);

  void
  initialize_support_points(const unsigned int rt_degree);

  void
  initialize_restriction();

  Table<2, double> boundary_weights;

  Table<3, double> interior_weights;

  void
  initialize_quad_dof_index_permutation_and_sign_change();
 
  // Allow access from other dimensions.
  template <int dim1>
  friend class FE_RaviartThomas;
};
 
 

template <int dim>
class FE_RaviartThomasNodal : public FE_PolyTensor<dim>
{
public:
  FE_RaviartThomasNodal(const unsigned int p);

  virtual std::string
  get_name() const override;
 
  // documentation inherited from the base class
  virtual std::unique_ptr<FiniteElement<dim, dim>>
  clone() const override;
 
  virtual void
  get_face_interpolation_matrix(const FiniteElement<dim> &source,
                                FullMatrix<double>       &matrix,
                                const unsigned int face_no = 0) const override;
 
  virtual void
  get_subface_interpolation_matrix(
    const FiniteElement<dim> &source,
    const unsigned int        subface,
    FullMatrix<double>       &matrix,
    const unsigned int        face_no = 0) const override;
 
  virtual void
  convert_generalized_support_point_values_to_dof_values(
    const std::vector<Vector<double>> &support_point_values,
    std::vector<double>               &nodal_values) const override;
 
  virtual bool
  hp_constraints_are_implemented() const override;
 
  virtual std::vector<std::pair<unsigned int, unsigned int>>
  hp_vertex_dof_identities(const FiniteElement<dim> &fe_other) const override;
 
  virtual std::vector<std::pair<unsigned int, unsigned int>>
  hp_line_dof_identities(const FiniteElement<dim> &fe_other) const override;
 
  virtual std::vector<std::pair<unsigned int, unsigned int>>
  hp_quad_dof_identities(const FiniteElement<dim> &fe_other,
                         const unsigned int        face_no = 0) const override;

  virtual FiniteElementDomination::Domination
  compare_for_domination(const FiniteElement<dim> &fe_other,
                         const unsigned int codim = 0) const override final;
 
  virtual const FullMatrix<double> &
  get_restriction_matrix(
    const unsigned int         child,
    const RefinementCase<dim> &refinement_case =
      RefinementCase<dim>::isotropic_refinement) const override;
 
  virtual const FullMatrix<double> &
  get_prolongation_matrix(
    const unsigned int         child,
    const RefinementCase<dim> &refinement_case =
      RefinementCase<dim>::isotropic_refinement) const override;
 
private:
  virtual bool
  has_support_on_face(const unsigned int shape_index,
                      const unsigned int face_index) const override;

  void
  initialize_quad_dof_index_permutation_and_sign_change();

  mutable Threads::Mutex restriction_matrix_mutex;
  mutable Threads::Mutex prolongation_matrix_mutex;
};

 
/* -------------- declaration of explicit specializations ------------- */
 
#ifndef DOXYGEN
 
template <>
void
FE_RaviartThomas<1>::initialize_restriction();
 
#endif // DOXYGEN
 
DEAL_II_NAMESPACE_CLOSE
 
#endif