From: Robin Görmer Date: Thu, 5 Sep 2024 08:19:56 +0000 (+0200) Subject: Patched GridTools::transform() to work on anisotropically refined meshes in 3D as... X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1ce73b3706838be2b748a663a0c658060bbe9e58;p=dealii.git Patched GridTools::transform() to work on anisotropically refined meshes in 3D as well --- diff --git a/doc/news/changes/minor/20240910Hiniborch b/doc/news/changes/minor/20240910Hiniborch new file mode 100644 index 0000000000..b69baa665e --- /dev/null +++ b/doc/news/changes/minor/20240910Hiniborch @@ -0,0 +1,6 @@ +Patched: GridTools::transform() now supports 3D +anisotropically refined grids. Note that FEValues +still do not support hanging node constraints for +anisotropically refined grids. +
+(Robin Hiniborch, 2024/09/10) diff --git a/include/deal.II/grid/grid_tools.h b/include/deal.II/grid/grid_tools.h index 7c191b68a6..a9f0a96d23 100644 --- a/include/deal.II/grid/grid_tools.h +++ b/include/deal.II/grid/grid_tools.h @@ -3145,7 +3145,7 @@ namespace GridTools // this line has children cell->face(face)->child(0)->vertex(1) = (cell->face(face)->vertex(0) + cell->face(face)->vertex(1)) / - 2; + 2.0; } } else if (dim == 3) @@ -3158,29 +3158,51 @@ namespace GridTools if (cell->face(face)->has_children() && !cell->face(face)->at_boundary()) { - Assert(cell->reference_cell() == - ReferenceCells::get_hypercube(), - ExcNotImplemented()); - - // this face has hanging nodes - cell->face(face)->child(0)->vertex(1) = - (cell->face(face)->vertex(0) + cell->face(face)->vertex(1)) / - 2.0; - cell->face(face)->child(0)->vertex(2) = - (cell->face(face)->vertex(0) + cell->face(face)->vertex(2)) / - 2.0; - cell->face(face)->child(1)->vertex(3) = - (cell->face(face)->vertex(1) + cell->face(face)->vertex(3)) / - 2.0; - cell->face(face)->child(2)->vertex(3) = - (cell->face(face)->vertex(2) + cell->face(face)->vertex(3)) / - 2.0; - - // center of the face - cell->face(face)->child(0)->vertex(3) = - (cell->face(face)->vertex(0) + cell->face(face)->vertex(1) + - cell->face(face)->vertex(2) + cell->face(face)->vertex(3)) / - 4.0; + if (static_cast(cell->face(face)->refinement_case()) == + RefinementCase::isotropic_refinement) + { + Assert(cell->reference_cell() == + ReferenceCells::get_hypercube(), + ExcNotImplemented()); + + // this face has hanging nodes + cell->face(face)->child(0)->vertex(1) = + (cell->face(face)->vertex(0) + + cell->face(face)->vertex(1)) / + 2.0; + cell->face(face)->child(0)->vertex(2) = + (cell->face(face)->vertex(0) + + cell->face(face)->vertex(2)) / + 2.0; + cell->face(face)->child(1)->vertex(3) = + (cell->face(face)->vertex(1) + + cell->face(face)->vertex(3)) / + 2.0; + cell->face(face)->child(2)->vertex(3) = + (cell->face(face)->vertex(2) + + cell->face(face)->vertex(3)) / + 2.0; + + // center of the face + cell->face(face)->child(0)->vertex(3) = + (cell->face(face)->vertex(0) + + cell->face(face)->vertex(1) + + cell->face(face)->vertex(2) + + cell->face(face)->vertex(3)) / + 4.0; + } + else + { + // Special case for anisotropic refinement + for (unsigned int line = 0; + line < GeometryInfo::faces_per_cell; + line++) + if (cell->face(face)->line(line)->has_children()) + cell->face(face)->line(line)->child(0)->vertex(1) = + (cell->face(face)->line(line)->vertex(0) + + cell->face(face)->line(line)->vertex(1)) / + 2.0; + } } } diff --git a/tests/grid/grid_tools_transform_02.cc b/tests/grid/grid_tools_transform_02.cc new file mode 100644 index 0000000000..52cc4e2f71 --- /dev/null +++ b/tests/grid/grid_tools_transform_02.cc @@ -0,0 +1,186 @@ +// ------------------------------------------------------------------------ +// +// SPDX-License-Identifier: LGPL-2.1-or-later +// Copyright (C) 2001 - 2024 by the deal.II authors +// +// This file is part of the deal.II library. +// +// Part of the source code is dual licensed under Apache-2.0 WITH +// LLVM-exception OR LGPL-2.1-or-later. Detailed license information +// governing the source code and code contributions can be found in +// LICENSE.md and CONTRIBUTING.md at the top level directory of deal.II. +// +// ------------------------------------------------------------------------ + + + +#include +#include +#include +#include + +#include "../tests.h" + + +Point<3> +trans_func(const Point<3> &p) +{ + Point<3> r(p[0] + p[1] * p[1], p[1], p[2]); + return r; +} + + +void +check_transform(Triangulation<3, 3> *tria, Triangulation<3, 3> *tria_ref) +{ + // run the test + std::vector treated_vertices(tria_ref->n_vertices(), false); + auto active_cell = tria->begin_active(); + auto tria_ref_end = tria_ref->end(); + for (auto active_cell_ref = tria_ref->begin_active(); + active_cell_ref != tria_ref_end; + ++active_cell_ref, ++active_cell) + { + // First, check hanging nodes + for (unsigned int face = 0; face < 6; ++face) + if (active_cell_ref->face(face)->has_children() && + !active_cell_ref->face(face)->at_boundary()) + { + for (unsigned int line = 0; line < 4; ++line) + if (active_cell_ref->face(face)->line(line)->has_children()) + { + auto transformed_vertex = + (trans_func( + active_cell_ref->face(face)->line(line)->vertex(0)) + + trans_func( + active_cell_ref->face(face)->line(line)->vertex(1))) / + 2.0; + treated_vertices[active_cell->face(face) + ->line(line) + ->child(0) + ->vertex_index(1)] = true; + if (active_cell->face(face)->line(line)->child(0)->vertex( + 1) != transformed_vertex) + { + std::cout << active_cell->face(face) + ->line(line) + ->child(0) + ->vertex(1) + << " should be " << transformed_vertex + << std::endl; + Assert(false, ExcInternalError()); + } + } + + if (static_cast( + active_cell_ref->face(face)->refinement_case()) == + RefinementCase<2>::isotropic_refinement) + { + // The middle of the anisotropic face is adjusted differently + auto transformed_vertex = + (trans_func(active_cell_ref->face(face)->vertex(0)) + + trans_func(active_cell_ref->face(face)->vertex(1)) + + trans_func(active_cell_ref->face(face)->vertex(2)) + + trans_func(active_cell_ref->face(face)->vertex(3))) / + 4.0; + treated_vertices + [active_cell->face(face)->child(0)->vertex_index(3)] = true; + if (active_cell->face(face)->child(0)->vertex(3) != + transformed_vertex) + { + std::cout + << active_cell->face(face)->child(0)->vertex_index(3) + << " should be " << transformed_vertex << std::endl; + Assert(false, ExcInternalError()); + } + } + } + + // Then, check all the other vertices + // std::cout << "Testing remaining vertices on " << + // active_cell_ref->level() + // << "." << active_cell_ref->index() << std::endl; + for (unsigned int vertex = 0; vertex < 8; vertex++) + if (!treated_vertices[active_cell->vertex_index(vertex)]) + { + auto transformed_vertex = + trans_func(active_cell_ref->vertex(vertex)); + treated_vertices[active_cell->vertex_index(vertex)] = true; + if (active_cell->vertex(vertex) != transformed_vertex) + { + std::cout << active_cell->vertex(vertex) << " should be " + << transformed_vertex << std::endl; + Assert(false, ExcInternalError()); + } + } + } +} + +void +refine_grid(const bool anisotropic, Triangulation<3, 3> *tria) +{ + tria->refine_global(1); + tria->execute_coarsening_and_refinement(); + + const unsigned int n_refs = anisotropic ? 3 : 2; + auto cell = tria->begin_active(); + for (unsigned int i = 0; i < n_refs; i++) + { + if (anisotropic) + cell->set_refine_flag(RefinementCase<3>::cut_axis(i)); + else + { + cell->set_refine_flag(); + cell++; + } + cell++; + } + tria->execute_coarsening_and_refinement(); +} + +void +test(const bool anisotropic) +{ + Triangulation<3> tria; + { + GridGenerator::hyper_cube(tria); + refine_grid(anisotropic, &tria); + + if (anisotropic) + deallog << "Anisotropic test" << std::endl; + else + deallog << "Isotropic test" << std::endl; + + deallog << "Unchanged grid:" << std::endl; + GridOut().write_gnuplot(tria, deallog.get_file_stream()); + // { + // std::ofstream f("grid1.vtk"); + // GridOut().write_vtk(tria, f); + // } + + GridTools::transform(trans_func, tria); + deallog << "transformed grid:" << std::endl; + GridOut().write_gnuplot(tria, deallog.get_file_stream()); + // { + // std::ofstream f("grid2.vtk"); + // GridOut().write_vtk(tria, f); + // } + } + + Triangulation<3> tria_ref; + GridGenerator::hyper_cube(tria_ref); + refine_grid(anisotropic, &tria_ref); + + check_transform(&tria, &tria_ref); +} + + +int +main() +{ + initlog(); + test(/* isotropic */ true); + test(/* anisotropic */ false); + + return 0; +} diff --git a/tests/grid/grid_tools_transform_02.output b/tests/grid/grid_tools_transform_02.output new file mode 100644 index 0000000000..924eedbff4 --- /dev/null +++ b/tests/grid/grid_tools_transform_02.output @@ -0,0 +1,2071 @@ + +DEAL::Anisotropic test +DEAL::Unchanged grid: +0.500000 0.500000 0.00000 1 0 +1.00000 0.500000 0.00000 1 0 +1.00000 0.500000 0.500000 1 0 +0.500000 0.500000 0.500000 1 0 +0.500000 0.500000 0.00000 1 0 + +0.500000 1.00000 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