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| 1 | +// The libMesh Finite Element Library. |
| 2 | +// Copyright (C) 2002-2025 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner |
| 3 | + |
| 4 | +// This library is free software; you can redistribute it and/or |
| 5 | +// modify it under the terms of the GNU Lesser General Public |
| 6 | +// License as published by the Free Software Foundation; either |
| 7 | +// version 2.1 of the License, or (at your option) any later version. |
| 8 | + |
| 9 | +// This library is distributed in the hope that it will be useful, |
| 10 | +// but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | +// Lesser General Public License for more details. |
| 13 | + |
| 14 | +// You should have received a copy of the GNU Lesser General Public |
| 15 | +// License along with this library; if not, write to the Free Software |
| 16 | +// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 17 | + |
| 18 | + |
| 19 | + |
| 20 | +#ifndef LIBMESH_OVERLAP_COUPLING_H |
| 21 | +#define LIBMESH_OVERLAP_COUPLING_H |
| 22 | + |
| 23 | +// Local Includes |
| 24 | +#include "libmesh/ghosting_functor.h" |
| 25 | + |
| 26 | +#include "libmesh/fe_map.h" |
| 27 | +#include "libmesh/quadrature.h" |
| 28 | + |
| 29 | +// C++ Includes |
| 30 | +#include <memory> |
| 31 | + |
| 32 | +namespace libMesh |
| 33 | +{ |
| 34 | + |
| 35 | +// Forward declarations |
| 36 | +class PeriodicBoundaries; |
| 37 | + |
| 38 | + |
| 39 | +/** |
| 40 | + * This class implements ghosting of elements that overlap or touch at |
| 41 | + * at least one sampled point, even if no topological connection |
| 42 | + * between the elements exists. This may be useful for immersed |
| 43 | + * methods, or for integration along both sides of mesh "slits" with |
| 44 | + * no neighbor information. |
| 45 | + * |
| 46 | + * \author Roy H. Stogner |
| 47 | + * \date 2025 |
| 48 | + */ |
| 49 | +class OverlapCoupling : public GhostingFunctor |
| 50 | +{ |
| 51 | +public: |
| 52 | + |
| 53 | + /** |
| 54 | + * Constructor. Defaults to using a Simpson's Rule quadrature to |
| 55 | + * choose sampling points. Users may wish to attach custom |
| 56 | + * quadrature rules matching those used for their system |
| 57 | + * integration. |
| 58 | + */ |
| 59 | + OverlapCoupling(); |
| 60 | + |
| 61 | + /** |
| 62 | + * Copy constructor. |
| 63 | + */ |
| 64 | + OverlapCoupling(const OverlapCoupling & other); |
| 65 | + |
| 66 | + /** |
| 67 | + * A clone() is needed because GhostingFunctor can not be shared between |
| 68 | + * different meshes. The operations in GhostingFunctor are mesh dependent. |
| 69 | + */ |
| 70 | + virtual std::unique_ptr<GhostingFunctor> clone () const override |
| 71 | + { return std::make_unique<OverlapCoupling>(*this); } |
| 72 | + |
| 73 | + // Change coupling matrix after construction |
| 74 | + void set_dof_coupling(const CouplingMatrix * dof_coupling) |
| 75 | + { _dof_coupling = dof_coupling; } |
| 76 | + |
| 77 | + // Change quadrature rule after construction. This function takes |
| 78 | + // ownership of the rule object and uses it for elements of the |
| 79 | + // appropriate dimension. |
| 80 | + void set_quadrature_rule(std::unique_ptr<QBase> new_q_rule); |
| 81 | + |
| 82 | + /** |
| 83 | + * We need an updated point locator to see what other elements might |
| 84 | + * share each quadrature point. |
| 85 | + */ |
| 86 | + virtual void mesh_reinit () override; |
| 87 | + |
| 88 | + virtual void redistribute () override |
| 89 | + { this->mesh_reinit(); } |
| 90 | + |
| 91 | + virtual void delete_remote_elements() override |
| 92 | + { this->mesh_reinit(); } |
| 93 | + |
| 94 | + /** |
| 95 | + * For the specified range of active elements, find the elements |
| 96 | + * which will be coupled to them in the sparsity pattern. |
| 97 | + * |
| 98 | + * This will include whatever the point locator finds at each |
| 99 | + * quadrature point in the range. |
| 100 | + */ |
| 101 | + virtual void operator() (const MeshBase::const_element_iterator & range_begin, |
| 102 | + const MeshBase::const_element_iterator & range_end, |
| 103 | + processor_id_type p, |
| 104 | + map_type & coupled_elements) override; |
| 105 | + |
| 106 | +private: |
| 107 | + |
| 108 | + const CouplingMatrix * _dof_coupling; |
| 109 | + |
| 110 | + // Quadrature rules for different element dimensions |
| 111 | + std::array<std::unique_ptr<QBase>, 3> _q_rules; |
| 112 | + |
| 113 | + // FE Map from quadrature space to physical space |
| 114 | + FEMap _fe_map; |
| 115 | +}; |
| 116 | + |
| 117 | +} // namespace libMesh |
| 118 | + |
| 119 | +#endif // LIBMESH_OVERLAP_COUPLING_H |
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