mapping_q_eulerian.h

// ---------------------------------------------------------------------
//
// Copyright (C) 2001 - 2018 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, 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.
// The full text of the license can be found in the file LICENSE.md at
// the top level directory of deal.II.
//
// ---------------------------------------------------------------------


#ifndef dealii_mapping_q_eulerian_h
#define dealii_mapping_q_eulerian_h

#include <deal.II/base/config.h>

#include <deal.II/base/smartpointer.h>
#include <deal.II/base/thread_management.h>

#include <deal.II/dofs/dof_accessor.h>
#include <deal.II/dofs/dof_handler.h>

#include <deal.II/fe/fe_values.h>
#include <deal.II/fe/mapping_q.h>

#include <deal.II/grid/tria_iterator.h>


DEAL_II_NAMESPACE_OPEN

template <typename>
class Vector;



template <int dim, typename VectorType = Vector<double>, int spacedim = dim>
class MappingQEulerian : public MappingQ<dim, spacedim>
{
public:
  MappingQEulerian(const unsigned int               degree,
                   const DoFHandler<dim, spacedim> &euler_dof_handler,
                   const VectorType &               euler_vector,
                   const unsigned int level = numbers::invalid_unsigned_int);

  virtual std::array<Point<spacedim>, GeometryInfo<dim>::vertices_per_cell>
  get_vertices(const typename Triangulation<dim, spacedim>::cell_iterator &cell)
    const override;

  virtual std::unique_ptr<Mapping<dim, spacedim>>
  clone() const override;

  virtual bool
  preserves_vertex_locations() const override;

  DeclException0(ExcInactiveCell);

protected:
  virtual CellSimilarity::Similarity
  fill_fe_values(
    const typename Triangulation<dim, spacedim>::cell_iterator &cell,
    const CellSimilarity::Similarity                            cell_similarity,
    const Quadrature<dim> &                                     quadrature,
    const typename Mapping<dim, spacedim>::InternalDataBase &   internal_data,
    internal::FEValuesImplementation::MappingRelatedData<dim, spacedim>
      &output_data) const override;

  SmartPointer<const VectorType, MappingQEulerian<dim, VectorType, spacedim>>
    euler_vector;

  SmartPointer<const DoFHandler<dim, spacedim>,
               MappingQEulerian<dim, VectorType, spacedim>>
    euler_dof_handler;


private:
  const unsigned int level;

  class MappingQEulerianGeneric : public MappingQGeneric<dim, spacedim>
  {
  public:
    MappingQEulerianGeneric(
      const unsigned int                                 degree,
      const MappingQEulerian<dim, VectorType, spacedim> &mapping_q_eulerian);

    virtual std::array<Point<spacedim>, GeometryInfo<dim>::vertices_per_cell>
    get_vertices(const typename Triangulation<dim, spacedim>::cell_iterator
                   &cell) const override;

    virtual std::vector<Point<spacedim>>
    compute_mapping_support_points(
      const typename Triangulation<dim, spacedim>::cell_iterator &cell)
      const override;

    virtual bool
    preserves_vertex_locations() const override;

  private:
    const MappingQEulerian<dim, VectorType, spacedim> &mapping_q_eulerian;


    class SupportQuadrature : public Quadrature<dim>
    {
    public:
      SupportQuadrature(const unsigned int map_degree);
    };

    const SupportQuadrature support_quadrature;

    mutable FEValues<dim, spacedim> fe_values;

    mutable Threads::Mutex fe_values_mutex;
  };
};

/*----------------------------------------------------------------------*/

#ifndef DOXYGEN

template <int dim, typename VectorType, int spacedim>
inline bool
MappingQEulerian<dim, VectorType, spacedim>::preserves_vertex_locations() const
{
  return false;
}

#endif // DOXYGEN


DEAL_II_NAMESPACE_CLOSE


#endif // dealii_mapping_q_eulerian_h