MGTwoLevelTransfer: enable FE_Nothing #12891
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| // --------------------------------------------------------------------- | ||
| // | ||
| // Copyright (C) 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 MGTwoLevelTransfer::interpolate() for DoFHandlers with `FE_Nothing`. | ||
| */ | ||
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| #include <deal.II/base/conditional_ostream.h> | ||
| #include <deal.II/base/function_lib.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_nothing.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/data_out.h> | ||
| #include <deal.II/numerics/vector_tools.h> | ||
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| #include "mg_transfer_util.h" | ||
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| using namespace dealii; | ||
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| template <int dim> | ||
| class AnalyticalSolution : public Function<dim> | ||
| { | ||
| public: | ||
| AnalyticalSolution() | ||
| {} | ||
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| virtual double | ||
| value(const Point<dim> &p, const unsigned int component = 0) const override | ||
| { | ||
| (void)component; | ||
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| return p[0]; | ||
| } | ||
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| private: | ||
| }; | ||
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Comment on lines
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There was a problem hiding this comment. How about using dealii/include/deal.II/base/function_lib.h Lines 1329 to 1330 in 21e7779 exponents = {1, 0, 0}?
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| template <int dim, typename Number = double> | ||
| void | ||
| do_test(const hp::FECollection<dim> &fe_fine, | ||
| const hp::FECollection<dim> &fe_coarse) | ||
| { | ||
| parallel::distributed::Triangulation<dim> tria(MPI_COMM_WORLD); | ||
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| // create grid | ||
| GridGenerator::hyper_cube(tria); | ||
| tria.refine_global(2); | ||
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| // setup dof-handlers | ||
| DoFHandler<dim> dof_handler_fine(tria); | ||
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| if (fe_fine.size() > 1) | ||
| { | ||
| for (const auto &cell : dof_handler_fine.active_cell_iterators()) | ||
| if (cell->center()[0] < 0.5) | ||
| cell->set_active_fe_index(0); | ||
| else | ||
| cell->set_active_fe_index(1); | ||
| } | ||
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| dof_handler_fine.distribute_dofs(fe_fine); | ||
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| DoFHandler<dim> dof_handler_coarse(tria); | ||
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| if (fe_coarse.size() > 1) | ||
| { | ||
| for (const auto &cell : dof_handler_coarse.active_cell_iterators()) | ||
| if (cell->center()[0] < 0.5) | ||
| cell->set_active_fe_index(0); | ||
| else | ||
| cell->set_active_fe_index(1); | ||
| } | ||
| dof_handler_coarse.distribute_dofs(fe_coarse); | ||
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| AffineConstraints<Number> dummy; | ||
| dummy.close(); | ||
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| // setup transfer operator | ||
| MGTwoLevelTransfer<dim, LinearAlgebra::distributed::Vector<Number>> transfer; | ||
| transfer.reinit_polynomial_transfer(dof_handler_fine, | ||
| dof_handler_coarse, | ||
| dummy, | ||
| dummy); | ||
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| LinearAlgebra::distributed::Vector<Number> vec_fine( | ||
| dof_handler_fine.n_dofs()); | ||
| LinearAlgebra::distributed::Vector<Number> vec_coarse( | ||
| dof_handler_coarse.n_dofs()); | ||
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| Tensor<1, dim, Number> exp; | ||
| exp[0] = 1.0; | ||
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| VectorTools::interpolate(dof_handler_fine, | ||
| Functions::Monomial<dim>(exp), | ||
| vec_fine); | ||
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| transfer.interpolate(vec_coarse, vec_fine); | ||
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| DataOut<dim> data_out; | ||
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| data_out.add_data_vector(dof_handler_coarse, vec_coarse, "solution_coarse"); | ||
| data_out.add_data_vector(dof_handler_fine, vec_fine, "solution_fine"); | ||
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| data_out.build_patches(); | ||
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| static unsigned int counter = 0; | ||
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| #if 0 | ||
| data_out.write_vtu_with_pvtu_record( | ||
| "./", "result", counter++, tria.get_communicator(), 3, 1); | ||
| #else | ||
| deallog << std::endl; | ||
| data_out.write_vtk(deallog.get_file_stream()); | ||
| #endif | ||
| } | ||
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| template <int dim, typename Number> | ||
| void | ||
| test(const FiniteElement<dim> &fe_fine, const FiniteElement<dim> &fe_coarse) | ||
| { | ||
| deallog.push("0"); | ||
| do_test(hp::FECollection<dim>(fe_fine), hp::FECollection<dim>(fe_coarse)); | ||
| deallog.pop(); | ||
| deallog.push("1"); | ||
| do_test(hp::FECollection<dim>(fe_fine, FE_Nothing<dim>()), | ||
| hp::FECollection<dim>(fe_coarse)); | ||
| deallog.pop(); | ||
| deallog.push("2"); | ||
| do_test(hp::FECollection<dim>(fe_fine), | ||
| hp::FECollection<dim>(fe_coarse, FE_Nothing<dim>())); | ||
| deallog.pop(); | ||
| deallog.push("3"); | ||
| do_test(hp::FECollection<dim>(fe_fine, FE_Nothing<dim>()), | ||
| hp::FECollection<dim>(fe_coarse, FE_Nothing<dim>())); | ||
| deallog.pop(); | ||
| } | ||
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| template <int dim, typename Number> | ||
| void | ||
| test() | ||
| { | ||
| const unsigned int fe_degree = 2; | ||
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| deallog.push("CG<->CG"); | ||
| test<dim, Number>(FE_Q<dim>(fe_degree), FE_Q<dim>(fe_degree)); | ||
| deallog.pop(); | ||
| deallog.push("DG<->CG"); | ||
| test<dim, Number>(FE_DGQ<dim>(fe_degree), FE_Q<dim>(fe_degree)); | ||
| deallog.pop(); | ||
| deallog.push("CG<->DG"); | ||
| test<dim, Number>(FE_Q<dim>(fe_degree), FE_DGQ<dim>(fe_degree)); | ||
| deallog.pop(); | ||
| deallog.push("DG<->DG"); | ||
| test<dim, Number>(FE_DGQ<dim>(fe_degree), FE_DGQ<dim>(fe_degree)); | ||
| deallog.pop(); | ||
| } | ||
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| int | ||
| main(int argc, char **argv) | ||
| { | ||
| Utilities::MPI::MPI_InitFinalize mpi_initialization(argc, argv, 1); | ||
| MPILogInitAll all; | ||
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| deallog.precision(8); | ||
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| test<2, double>(); | ||
| } | ||
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So this was a bug before, but we never actually triggered the alternative element?
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Yes. It was "just" an assert ;)