Patched GridTools::transform() to work on anisotropically refined meshes in 3D as...

diff --git a/doc/news/changes/minor/20240910Hiniborch b/doc/news/changes/minor/20240910Hiniborch
new file mode 100644 (file)
index 0000000..b69baa6
--- /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.
+<br>
+(Robin Hiniborch, 2024/09/10)

diff --git a/include/deal.II/grid/grid_tools.h b/include/deal.II/grid/grid_tools.h
index 7c191b68a600af23704f00e22df5a5822048bcf4..a9f0a96d235b81fa757ab596d408371a3ee46ebd 100644 (file)
--- 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<dim>(),
-                       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<uint8_t>(cell->face(face)->refinement_case()) ==
+                    RefinementCase<dim - 1>::isotropic_refinement)
+                  {
+                    Assert(cell->reference_cell() ==
+                             ReferenceCells::get_hypercube<dim>(),
+                           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<dim - 1>::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 (file)
index 0000000..52cc4e2
--- /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 <deal.II/grid/grid_generator.h>
+#include <deal.II/grid/grid_out.h>
+#include <deal.II/grid/grid_tools.h>
+#include <deal.II/grid/tria.h>
+
+#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<bool> 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<uint8_t>(
+                  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 (file)
index 0000000..924eedb
--- /dev/null
+++ b/tests/grid/grid_tools_transform_02.output
@@ -0,0 +1,2071 @@
+
+DEAL::Anisotropic test
+DEAL::Unchanged grid:
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