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 at
// the top level of the deal.II distribution.
//
// ---------------------------------------------------------------------


#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/grid/tria_iterator.h>
#include <deal.II/dofs/dof_handler.h>
#include <deal.II/dofs/dof_accessor.h>
#include <deal.II/fe/fe_values.h>
#include <deal.II/fe/mapping_q.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