MultiMeshDirichletBC.h

// Copyright (C) 2014-2016 Anders Logg
//
// This file is part of DOLFIN.
//
// DOLFIN 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 4 of the License, or
// (at your option) any later version.
//
// DOLFIN 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 DOLFIN. If not, see <http://www.gnu.org/licenses/>.
//
// First added:  2014-05-12
// Last changed: 2016-03-02

#ifndef __MULTI_MESH_DIRICHLET_BC_H
#define __MULTI_MESH_DIRICHLET_BC_H

#include <vector>
#include <memory>
#include <dolfin/mesh/SubDomain.h>

namespace dolfin
{

  // Forward declarations
  class MultiMeshFunctionSpace;
  class GenericFunction;
  class SubDomain;
  class GenericMatrix;
  class GenericVector;
  class DirichletBC;


  class MultiMeshDirichletBC
  {
  public:

    MultiMeshDirichletBC(std::shared_ptr<const MultiMeshFunctionSpace> V,
                         std::shared_ptr<const GenericFunction> g,
                         std::shared_ptr<const SubDomain> sub_domain,
                         std::string method="topological",
                         bool check_midpoint=true,
                         bool exclude_overlapped_boundaries=true);

    MultiMeshDirichletBC(std::shared_ptr<const MultiMeshFunctionSpace> V,
                         std::shared_ptr<const GenericFunction> g,
                         std::shared_ptr<const MeshFunction<std::size_t>> sub_domains,
                         std::size_t sub_domain,
                         std::size_t part,
                         std::string method="topological");

    MultiMeshDirichletBC(const MultiMeshDirichletBC& bc);

    ~MultiMeshDirichletBC();

    std::shared_ptr<const MultiMeshFunctionSpace> function_space() const
    { return _function_space; }

    std::shared_ptr<DirichletBC> view(std::size_t part) const
    {
      dolfin_assert(part < _bcs.size());
      return _bcs[part];
    }

    void apply(GenericMatrix& A) const;

    void apply(GenericVector& b) const;

    void apply(GenericMatrix& A,
               GenericVector& b) const;

    void apply(GenericVector& b,
               const GenericVector& x) const;

    void apply(GenericMatrix& A,
               GenericVector& b,
               const GenericVector& x) const;

    void zero(GenericMatrix& A) const;

    void homogenize();

  private:

    // Subclass of SubDomain wrapping user-defined subdomain
    class MultiMeshSubDomain : public SubDomain
    {
    public:

      // Constructor
      MultiMeshSubDomain(std::shared_ptr<const SubDomain> sub_domain,
                         std::shared_ptr<const MultiMesh> multimesh,
                         bool exclude_overlapped_boundaries);

      // Destructor
      ~MultiMeshSubDomain();

      // Callback for checking whether point is in domain
      bool inside(const Array<double>& x, bool on_boundary) const;

      // Set current part
      void set_current_part(std::size_t current_part);

    private:

      // User-defined subdomain
      std::shared_ptr<const SubDomain> _user_sub_domain;

      // Multimesh
      std::shared_ptr<const MultiMesh> _multimesh;

      // Current part
      std::size_t _current_part;

      // Check whether to exclude boundaries overlapped by other meshes
      bool _exclude_overlapped_boundaries;

    };

    // Multimesh function space
    std::shared_ptr<const MultiMeshFunctionSpace> _function_space;

    // List of boundary conditions for parts
    std::vector<std::shared_ptr<DirichletBC>> _bcs;

    // Wrapper of user-defined subdomain
    mutable std::shared_ptr<MultiMeshSubDomain> _sub_domain;

    // Check whether to exclude boundaries overlapped by other meshes
    bool _exclude_overlapped_boundaries;

  };

}

#endif