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Merge pull request #13603 from peterrum/gc_interpolate_to_mg_fix
Fix MGTransferGlobalCoarsening::interpolate_to_mg()
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| // --------------------------------------------------------------------- | ||
| // | ||
| // Copyright (C) 2020 - 2021 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.md at | ||
| // the top level directory of deal.II. | ||
| // | ||
| // --------------------------------------------------------------------- | ||
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| /** | ||
| * Test MGTransferGlobalCoarsening::interpolate_to_mg() for FE_Q and FE_DGQ. | ||
| */ | ||
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| #include <deal.II/base/conditional_ostream.h> | ||
| #include <deal.II/base/logstream.h> | ||
| #include <deal.II/base/mpi.h> | ||
| #include <deal.II/base/quadrature_lib.h> | ||
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| #include <deal.II/distributed/tria.h> | ||
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| #include <deal.II/dofs/dof_handler.h> | ||
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| #include <deal.II/fe/fe_dgq.h> | ||
| #include <deal.II/fe/fe_q.h> | ||
| #include <deal.II/fe/fe_system.h> | ||
| #include <deal.II/fe/fe_tools.h> | ||
| #include <deal.II/fe/mapping_q.h> | ||
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| #include <deal.II/grid/grid_generator.h> | ||
| #include <deal.II/grid/grid_out.h> | ||
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| #include <deal.II/matrix_free/fe_evaluation.h> | ||
| #include <deal.II/matrix_free/matrix_free.h> | ||
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| #include <deal.II/multigrid/mg_constrained_dofs.h> | ||
| #include <deal.II/multigrid/mg_transfer_global_coarsening.h> | ||
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| #include <deal.II/numerics/vector_tools.h> | ||
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| #include "../tests.h" | ||
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| template <int dim> | ||
| void | ||
| create_quadrant(Triangulation<dim> &tria, const unsigned int n_refinements) | ||
| { | ||
| GridGenerator::hyper_cube(tria, -1.0, +1.0); | ||
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| if (n_refinements == 0) | ||
| return; | ||
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| tria.refine_global(1); | ||
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| for (unsigned int i = 1; i < n_refinements; i++) | ||
| { | ||
| for (auto cell : tria.active_cell_iterators()) | ||
| if (cell->is_locally_owned()) | ||
| { | ||
| bool flag = true; | ||
| for (int d = 0; d < dim; d++) | ||
| if (cell->center()[d] > 0.0) | ||
| flag = false; | ||
| if (flag) | ||
| cell->set_refine_flag(); | ||
| } | ||
| tria.execute_coarsening_and_refinement(); | ||
| } | ||
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| AssertDimension(tria.n_global_levels() - 1, n_refinements); | ||
| } | ||
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| template <int dim> | ||
| std::shared_ptr<Utilities::MPI::Partitioner> | ||
| create_partitioner(const DoFHandler<dim> &dof_handler) | ||
| { | ||
| return std::make_shared<Utilities::MPI::Partitioner>( | ||
| dof_handler.locally_owned_dofs(), | ||
| DoFTools::extract_locally_active_dofs(dof_handler), | ||
| dof_handler.get_communicator()); | ||
| } | ||
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| template <int dim> | ||
| class RightHandSideFunction : public Function<dim> | ||
| { | ||
| public: | ||
| RightHandSideFunction() | ||
| : Function<dim>(1) | ||
| {} | ||
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| virtual double | ||
| value(const Point<dim> &p, const unsigned int component = 0) const | ||
| { | ||
| (void)component; | ||
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| return p[0]; | ||
| } | ||
| }; | ||
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| template <int dim, typename Number = double> | ||
| void | ||
| test(const unsigned int n_refinements, | ||
| const unsigned int fe_degree_fine, | ||
| const bool do_dg) | ||
| { | ||
| using VectorType = LinearAlgebra::distributed::Vector<Number>; | ||
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| const unsigned int min_level = 0; | ||
| const unsigned int max_level = n_refinements; | ||
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| parallel::distributed::Triangulation<dim> tria(MPI_COMM_WORLD); | ||
| create_quadrant(tria, n_refinements); | ||
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| const auto trias = | ||
| MGTransferGlobalCoarseningTools::create_geometric_coarsening_sequence(tria); | ||
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| MGLevelObject<DoFHandler<dim>> dof_handlers(min_level, max_level); | ||
| MGLevelObject<MGTwoLevelTransfer<dim, VectorType>> transfers(min_level, | ||
| max_level); | ||
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| for (auto l = min_level; l <= max_level; ++l) | ||
| { | ||
| auto &dof_handler = dof_handlers[l]; | ||
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| dof_handler.reinit(*trias[l]); | ||
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| if (do_dg) | ||
| dof_handler.distribute_dofs(FE_DGQ<dim>{fe_degree_fine}); | ||
| else | ||
| dof_handler.distribute_dofs(FE_Q<dim>{fe_degree_fine}); | ||
| } | ||
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| for (unsigned int l = min_level; l < max_level; ++l) | ||
| transfers[l + 1].reinit(dof_handlers[l + 1], dof_handlers[l]); | ||
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| MGTransferGlobalCoarsening<dim, VectorType> transfer( | ||
| transfers, [&](const auto l, auto &vec) { | ||
| vec.reinit(create_partitioner(dof_handlers[l])); | ||
| }); | ||
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| VectorType vec; | ||
| vec.reinit(create_partitioner(dof_handlers[max_level])); | ||
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| RightHandSideFunction<dim> fu; | ||
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| VectorTools::interpolate(dof_handlers[max_level], fu, vec); | ||
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| MGLevelObject<VectorType> results(min_level, max_level); | ||
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| transfer.interpolate_to_mg(dof_handlers[max_level], results, vec); | ||
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| for (unsigned int l = min_level; l <= max_level; ++l) | ||
| { | ||
| results[l].update_ghost_values(); | ||
| Vector<float> norm_per_cell(trias[l]->n_active_cells()); | ||
| VectorTools::integrate_difference(dof_handlers[l], | ||
| results[l], | ||
| fu, | ||
| norm_per_cell, | ||
| QGauss<dim>(fe_degree_fine + 2), | ||
| VectorTools::L2_norm); | ||
| const double error_L2_norm = | ||
| VectorTools::compute_global_error(*trias[l], | ||
| norm_per_cell, | ||
| VectorTools::L2_norm); | ||
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| deallog << l << " " << results[l].l2_norm() << " " << error_L2_norm | ||
| << std::endl; | ||
| } | ||
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| deallog << std::endl; | ||
| } | ||
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| int | ||
| main(int argc, char **argv) | ||
| { | ||
| Utilities::MPI::MPI_InitFinalize mpi_initialization(argc, argv, 1); | ||
| initlog(); | ||
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| deallog.precision(8); | ||
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| for (unsigned int n_refinements = 2; n_refinements <= 4; ++n_refinements) | ||
| for (unsigned int degree = 1; degree <= 4; ++degree) | ||
| { | ||
| test<2>(n_refinements, degree, true); | ||
| test<2>(n_refinements, degree, false); | ||
| } | ||
| } |
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