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// $Id: mapping_q1_eulerian.h 20159 2009-11-24 03:25:41Z bangerth $
// Version: $Name$
//
// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2008, 2009 by the deal.II authors
//
// This file is subject to QPL and may not be distributed
// without copyright and license information. Please refer
// to the file deal.II/doc/license.html for the text and
// further information on this license.
//
//---------------------------------------------------------------------------
#ifndef __deal2__mapping_q1_eulerian_h
#define __deal2__mapping_q1_eulerian_h
#include <base/config.h>
#include <base/smartpointer.h>
#include <fe/mapping_q1.h>
DEAL_II_NAMESPACE_OPEN
/*!@addtogroup mapping */
/*@{*/
/**
* Eulerian mapping of general unit cells by d-linear shape
* functions. Each cell is thus shifted in space by values given to
* the mapping through a finite element field.
*
* <h3>Usage</h3>
*
* The constructor of this class takes two arguments: a reference to
* the vector that defines the mapping from the reference
* configuration to the current configuration and a reference to the
* DoFHandler. The vector should then represent a (flattened out
* version of a) vector valued field defined at nodes defined by the
* the DoFHandler, where the number of components of the vector
* field equals the number of space dimensions. Thus, the
* DoFHandler shall operate on a finite element that has as many
* components as space dimensions. As an additional requirement, we
* impose that it have as many degree of freedom per vertex as there
* are space dimensions; since this object only evaluates the finite
* element field at the vertices, the values
* of all other degrees of freedom (not associated to vertices) are
* ignored. These requirements are met if the finite element which the
* given DoFHandler operates on is constructed as a system
* element (FESystem) from @p dim continuous FE_Q()
* objects.
*
* In many cases, the shift vector will also be the solution vector of
* the problem under investigation. If this is not the case (i.e. the
* number of components of the solution variable is not equal to the
* space dimension, e.g. for scalar problems in <tt>dim>1</tt> where the
* Eulerian coordinates only give a background field) or for coupled
* problems where more variables are computed than just the flow
* field), then a different DoFHandler has to be set up on the
* given triangulation, and the shift vector has then to be associated
* to it.
*
* An example is shown below:
* @verbatim
* FESystem<dim> fe(FE_Q<dim>(1), dim);
* DoFHandler<dim> flowfield_dof_handler(triangulation);
* flowfield_dof_handler.distribute_dofs(fe);
* Vector<double> map_points(flowfield_dof_handler.n_dofs());
* MappingQ1Eulerian<dim> mymapping(map_points, flowfield_dof_handler);
* @endverbatim
*
* Note that since the vector of shift values and the dof handler are
* only associated to this object at construction time, you have to
* make sure that whenever you use this object, the given objects
* still represent valid data.
*
* To enable the use of the MappingQ1Eulerian class also in the context
* of parallel codes using the PETSc wrapper classes, the type of
* the vector can be specified as template parameter <tt>EulerVectorType</tt>
* Not specifying this template argument in applications using the PETSc
* vector classes leads to the construction of a copy of the vector
* which is not acccessible afterwards!
*
* For more information about the <tt>spacedim</tt> template parameter
* check the documentation of FiniteElement or the one of
* Triangulation.
*
* @author Michael Stadler, 2001
*/
template <int dim, class VECTOR = Vector<double>, int spacedim=dim >
class MappingQ1Eulerian : public MappingQ1<dim,spacedim>
{
public:
/**
* Constructor. It takes a
* <tt>Vector<double> &</tt> as its
* first argument to specify the
* transformation of the whole
* problem from the reference to
* the current configuration.
* The organization of the
* elements in the @p Vector
* must follow the concept how
* deal.II stores solutions that
* are associated to a
* triangulation. This is
* automatically the case if the
* @p Vector represents the
* solution of the previous step
* of a nonlinear problem.
* Alternatively, the @p Vector
* can be initialized by
* <tt>DoFAccessor::set_dof_values()</tt>.
*/
MappingQ1Eulerian (const VECTOR &euler_transform_vectors,
const DoFHandler<dim,spacedim> &shiftmap_dof_handler);
/**
* Return a pointer to a copy of the
* present object. The caller of this
* copy then assumes ownership of it.
*/
virtual
Mapping<dim,spacedim> * clone () const;
/**
* Always returns @p false because
* MappingQ1Eulerian does not in general
* preserve vertex locations (unless the
* translation vector happens to provide
* for zero displacements at vertex
* locations).
*/
bool preserves_vertex_locations () const;
/**
* Exception
*/
DeclException0 (ExcWrongNoOfComponents);
/**
* Exception.
*/
DeclException2 (ExcWrongVectorSize,
int, int,
<< "Vector has wrong size " << arg1
<< ", expected size " << arg2);
/**
* Exception.
*/
DeclException0 (ExcInactiveCell);
protected:
/**
* Implementation of the interface in
* MappingQ1. Overrides the function in
* the base class, since we cannot use
* any cell similarity for this class.
*/
virtual void
fill_fe_values (const typename Triangulation<dim,spacedim>::cell_iterator &cell,
const Quadrature<dim> &quadrature,
typename Mapping<dim,spacedim>::InternalDataBase &mapping_data,
typename std::vector<Point<spacedim> > &quadrature_points,
std::vector<double> &JxW_values,
std::vector<Tensor<2,spacedim> > &jacobians,
std::vector<Tensor<3,spacedim> > &jacobian_grads,
std::vector<Tensor<2,spacedim> > &inverse_jacobians,
std::vector<Point<spacedim> > &cell_normal_vectors,
CellSimilarity::Similarity &cell_similarity) const;
/**
* Reference to the vector of
* shifts.
*/
const VECTOR &euler_transform_vectors;
/**
* Pointer to the DoFHandler to
* which the mapping vector is
* associated.
*/
const SmartPointer<const DoFHandler<dim,spacedim>,MappingQ1Eulerian<dim,VECTOR,spacedim> > shiftmap_dof_handler;
private:
/**
* Computes the support points of
* the mapping. For
* @p MappingQ1Eulerian these
* are the vertices.
*/
virtual void compute_mapping_support_points(
const typename Triangulation<dim,spacedim>::cell_iterator &cell,
std::vector<Point<spacedim> > &a) const;
};
/*@}*/
/*----------------------------------------------------------------------*/
#ifndef DOXYGEN
template <int dim, class VECTOR, int spacedim>
inline
bool
MappingQ1Eulerian<dim,VECTOR,spacedim>::preserves_vertex_locations () const
{
return false;
}
#endif // DOXYGEN
DEAL_II_NAMESPACE_CLOSE
#endif
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