periodic_boundaries.C

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2019 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
 
// Local Includes
#include "libmesh/libmesh_config.h"
 
#ifdef LIBMESH_ENABLE_PERIODIC
 
#include "libmesh/periodic_boundaries.h"
#include "libmesh/point_locator_base.h"
#include "libmesh/elem.h"
#include "libmesh/periodic_boundary.h"
#include "libmesh/mesh_base.h"
 
namespace libMesh
{
 
PeriodicBoundaries::~PeriodicBoundaries()
{
  for (auto & pr : *this)
    delete pr.second;
}
 
 
 
PeriodicBoundaryBase * PeriodicBoundaries::boundary(boundary_id_type id)
{
  iterator i = this->find(id);
  if (i == this->end())
    return nullptr;
  return i->second;
}
 
 
 
const PeriodicBoundaryBase * PeriodicBoundaries::boundary(boundary_id_type id) const
{
  const_iterator i = this->find(id);
  if (i == this->end())
    return nullptr;
  return i->second;
}
 
 
 
 
const Elem * PeriodicBoundaries::neighbor(boundary_id_type boundary_id,
                                          const PointLocatorBase & point_locator,
                                          const Elem * e,
                                          unsigned int side) const
{
  // Find a point on that side (and only that side)
 
  Point p = e->build_side_ptr(side)->centroid();
 
  const PeriodicBoundaryBase * b = this->boundary(boundary_id);
  libmesh_assert (b);
  p = b->get_corresponding_pos(p);
 
  std::set<const Elem *> candidate_elements;
  point_locator.operator()(p, candidate_elements);
 
  // We might have found multiple elements, e.g. if two distinct periodic
  // boundaries are overlapping (see systems_of_equations_ex9, for example).
  // As a result, we need to search for the element that has boundary_id.
  const MeshBase & mesh = point_locator.get_mesh();
  for(const Elem * elem_it : candidate_elements)
    {
      unsigned int s_neigh =
        mesh.get_boundary_info().side_with_boundary_id(elem_it, b->pairedboundary);
 
      // If s_neigh is not invalid then we have found an element that contains
      // boundary_id, so return this element
      if(s_neigh != libMesh::invalid_uint)
        {
          return elem_it;
        }
    }
 
  libmesh_error_msg("Periodic boundary neighbor not found");
  return nullptr;
}
 
} // namespace libMesh
 
 
 
 
 
#endif // LIBMESH_ENABLE_PERIODIC