From: Peter Munch <peterrmuench@gmail.com>
Date: Wed, 27 Oct 2021 08:36:03 +0000 (+0200)
Subject: MGTwoLevelTransfer: enable FE_Nothing
X-Git-Tag: v9.4.0-rc1~878^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F12891%2Fhead;p=dealii.git

MGTwoLevelTransfer: enable FE_Nothing
---

diff --git a/include/deal.II/multigrid/mg_transfer_global_coarsening.templates.h b/include/deal.II/multigrid/mg_transfer_global_coarsening.templates.h
index e0fd104c58..97d7cff744 100644
--- a/include/deal.II/multigrid/mg_transfer_global_coarsening.templates.h
+++ b/include/deal.II/multigrid/mg_transfer_global_coarsening.templates.h
@@ -1632,14 +1632,31 @@ namespace internal
       transfer.n_components =
         dof_handler_fine.get_fe_collection().n_components();
 
+      // TODO: replace with std::all_of once FECellection supports range-based
+      // iterations
+      const auto all_of = [](const auto &fe_collection, const auto &fu) {
+        for (unsigned int i = 0; i < fe_collection.size(); ++i)
+          if (fu(fe_collection[i]) == false)
+            return false;
+
+        return true;
+      };
+
       transfer.fine_element_is_continuous =
-        dof_handler_fine.get_fe(0).n_dofs_per_vertex() > 0;
+        all_of(dof_handler_fine.get_fe_collection(), [](const auto &fe) {
+          return fe.n_dofs_per_cell() == 0 || fe.n_dofs_per_vertex() > 0;
+        });
 
-      for (unsigned int i = 0; i < dof_handler_fine.get_fe_collection().size();
-           ++i)
-        Assert(transfer.fine_element_is_continuous ==
-                 (dof_handler_fine.get_fe(i).n_dofs_per_vertex() > 0),
-               ExcInternalError());
+#if DEBUG
+      const bool fine_element_is_discontinuous =
+        all_of(dof_handler_fine.get_fe_collection(), [](const auto &fe) {
+          return fe.n_dofs_per_cell() == 0 || fe.n_dofs_per_vertex() == 0;
+        });
+
+      Assert(transfer.fine_element_is_continuous !=
+               fine_element_is_discontinuous,
+             ExcNotImplemented());
+#endif
 
       const auto process_cells = [&](const auto &fu) {
         loop_over_active_or_level_cells(
@@ -1757,7 +1774,7 @@ namespace internal
                 .reference_cell();
 
             Assert(reference_cell ==
-                     dof_handler_coarse.get_fe(fe_index_pair.first.second)
+                     dof_handler_coarse.get_fe(fe_index_pair.first.first)
                        .reference_cell(),
                    ExcNotImplemented());
 
@@ -1899,13 +1916,17 @@ namespace internal
               .reference_cell();
 
           Assert(reference_cell ==
-                   dof_handler_coarse.get_fe(fe_index_pair_.first.second)
+                   dof_handler_coarse.get_fe(fe_index_pair_.first.first)
                      .reference_cell(),
                  ExcNotImplemented());
 
           if (reference_cell == ReferenceCells::get_hypercube<dim>() &&
               (dof_handler_coarse.get_fe(fe_index_pair.first) !=
-               dof_handler_fine.get_fe(fe_index_pair.second)))
+               dof_handler_fine.get_fe(fe_index_pair.second)) &&
+              (dof_handler_coarse.get_fe(fe_index_pair.first)
+                   .n_dofs_per_cell() != 0 &&
+               dof_handler_fine.get_fe(fe_index_pair.second)
+                   .n_dofs_per_cell() != 0))
             {
               const auto fe_fine = create_1D_fe(
                 dof_handler_fine.get_fe(fe_index_pair.second).base_element(0));
@@ -1979,7 +2000,11 @@ namespace internal
             }
           else if (reference_cell != ReferenceCells::get_hypercube<dim>() &&
                    (dof_handler_coarse.get_fe(fe_index_pair.first) !=
-                    dof_handler_fine.get_fe(fe_index_pair.second)))
+                    dof_handler_fine.get_fe(fe_index_pair.second)) &&
+                   (dof_handler_coarse.get_fe(fe_index_pair.first)
+                        .n_dofs_per_cell() != 0 &&
+                    dof_handler_fine.get_fe(fe_index_pair.second)
+                        .n_dofs_per_cell() != 0))
             {
               const auto &fe_fine =
                 dof_handler_fine.get_fe(fe_index_pair.second).base_element(0);
@@ -2336,14 +2361,21 @@ MGTwoLevelTransfer<dim, LinearAlgebra::distributed::Vector<Number>>::
         {
           for (unsigned int cell = 0; cell < scheme.n_coarse_cells; ++cell)
             {
-              if (fine_element_is_continuous)
-                for (unsigned int i = 0; i < scheme.n_dofs_per_cell_fine; ++i)
-                  vec_fine_ptr->local_element(indices_fine[i]) +=
-                    read_dof_values(indices_coarse[i], vec_coarse) * weights[i];
-              else
-                for (unsigned int i = 0; i < scheme.n_dofs_per_cell_fine; ++i)
-                  vec_fine_ptr->local_element(indices_fine[i]) +=
-                    read_dof_values(indices_coarse[i], vec_coarse);
+              if ((scheme.n_dofs_per_cell_fine != 0) &&
+                  (scheme.n_dofs_per_cell_coarse != 0))
+                {
+                  if (fine_element_is_continuous)
+                    for (unsigned int i = 0; i < scheme.n_dofs_per_cell_fine;
+                         ++i)
+                      vec_fine_ptr->local_element(indices_fine[i]) +=
+                        read_dof_values(indices_coarse[i], vec_coarse) *
+                        weights[i];
+                  else
+                    for (unsigned int i = 0; i < scheme.n_dofs_per_cell_fine;
+                         ++i)
+                      vec_fine_ptr->local_element(indices_fine[i]) +=
+                        read_dof_values(indices_coarse[i], vec_coarse);
+                }
 
               indices_fine += scheme.n_dofs_per_cell_fine;
               indices_coarse += scheme.n_dofs_per_cell_coarse;
@@ -2488,18 +2520,25 @@ MGTwoLevelTransfer<dim, LinearAlgebra::distributed::Vector<Number>>::
         {
           for (unsigned int cell = 0; cell < scheme.n_coarse_cells; ++cell)
             {
-              if (fine_element_is_continuous)
-                for (unsigned int i = 0; i < scheme.n_dofs_per_cell_fine; ++i)
-                  distribute_local_to_global(
-                    indices_coarse[i],
-                    vec_fine_ptr->local_element(indices_fine[i]) * weights[i],
-                    this->vec_coarse);
-              else
-                for (unsigned int i = 0; i < scheme.n_dofs_per_cell_fine; ++i)
-                  distribute_local_to_global(indices_coarse[i],
-                                             vec_fine_ptr->local_element(
-                                               indices_fine[i]),
-                                             this->vec_coarse);
+              if ((scheme.n_dofs_per_cell_fine != 0) &&
+                  (scheme.n_dofs_per_cell_coarse != 0))
+                {
+                  if (fine_element_is_continuous)
+                    for (unsigned int i = 0; i < scheme.n_dofs_per_cell_fine;
+                         ++i)
+                      distribute_local_to_global(indices_coarse[i],
+                                                 vec_fine_ptr->local_element(
+                                                   indices_fine[i]) *
+                                                   weights[i],
+                                                 this->vec_coarse);
+                  else
+                    for (unsigned int i = 0; i < scheme.n_dofs_per_cell_fine;
+                         ++i)
+                      distribute_local_to_global(indices_coarse[i],
+                                                 vec_fine_ptr->local_element(
+                                                   indices_fine[i]),
+                                                 this->vec_coarse);
+                }
 
               indices_fine += scheme.n_dofs_per_cell_fine;
               indices_coarse += scheme.n_dofs_per_cell_coarse;
@@ -2625,9 +2664,11 @@ MGTwoLevelTransfer<dim, LinearAlgebra::distributed::Vector<Number>>::
         {
           for (unsigned int cell = 0; cell < scheme.n_coarse_cells; ++cell)
             {
-              for (unsigned int i = 0; i < scheme.n_dofs_per_cell_fine; ++i)
-                this->vec_coarse.local_element(indices_coarse[i]) =
-                  vec_fine_ptr->local_element(indices_fine[i]);
+              if ((scheme.n_dofs_per_cell_fine != 0) &&
+                  (scheme.n_dofs_per_cell_coarse != 0))
+                for (unsigned int i = 0; i < scheme.n_dofs_per_cell_fine; ++i)
+                  this->vec_coarse.local_element(indices_coarse[i]) =
+                    vec_fine_ptr->local_element(indices_fine[i]);
 
               indices_fine += scheme.n_dofs_per_cell_fine;
               indices_coarse += scheme.n_dofs_per_cell_coarse;
diff --git a/tests/multigrid-global-coarsening/fe_nothing_01.cc b/tests/multigrid-global-coarsening/fe_nothing_01.cc
new file mode 100644
index 0000000000..d64f59ea31
--- /dev/null
+++ b/tests/multigrid-global-coarsening/fe_nothing_01.cc
@@ -0,0 +1,201 @@
+// ---------------------------------------------------------------------
+//
+// 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.
+//
+// ---------------------------------------------------------------------
+
+
+/**
+ * Test MGTwoLevelTransfer::interpolate() for DoFHandlers with `FE_Nothing`.
+ */
+
+#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>
+
+#include <deal.II/distributed/tria.h>
+
+#include <deal.II/dofs/dof_handler.h>
+
+#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>
+
+#include <deal.II/grid/grid_generator.h>
+#include <deal.II/grid/grid_out.h>
+
+#include <deal.II/matrix_free/fe_evaluation.h>
+#include <deal.II/matrix_free/matrix_free.h>
+
+#include <deal.II/multigrid/mg_constrained_dofs.h>
+#include <deal.II/multigrid/mg_transfer_global_coarsening.h>
+
+#include <deal.II/numerics/data_out.h>
+#include <deal.II/numerics/vector_tools.h>
+
+#include "mg_transfer_util.h"
+
+using namespace dealii;
+
+template <int dim>
+class AnalyticalSolution : public Function<dim>
+{
+public:
+  AnalyticalSolution()
+  {}
+
+  virtual double
+  value(const Point<dim> &p, const unsigned int component = 0) const override
+  {
+    (void)component;
+
+    return p[0];
+  }
+
+private:
+};
+
+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);
+
+  // create grid
+  GridGenerator::hyper_cube(tria);
+  tria.refine_global(2);
+
+  // setup dof-handlers
+  DoFHandler<dim> dof_handler_fine(tria);
+
+  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);
+    }
+
+  dof_handler_fine.distribute_dofs(fe_fine);
+
+  DoFHandler<dim> dof_handler_coarse(tria);
+
+  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);
+
+  AffineConstraints<Number> dummy;
+  dummy.close();
+
+  // setup transfer operator
+  MGTwoLevelTransfer<dim, LinearAlgebra::distributed::Vector<Number>> transfer;
+  transfer.reinit_polynomial_transfer(dof_handler_fine,
+                                      dof_handler_coarse,
+                                      dummy,
+                                      dummy);
+
+  LinearAlgebra::distributed::Vector<Number> vec_fine(
+    dof_handler_fine.n_dofs());
+  LinearAlgebra::distributed::Vector<Number> vec_coarse(
+    dof_handler_coarse.n_dofs());
+
+  Tensor<1, dim, Number> exp;
+  exp[0] = 1.0;
+
+  VectorTools::interpolate(dof_handler_fine,
+                           Functions::Monomial<dim>(exp),
+                           vec_fine);
+
+  transfer.interpolate(vec_coarse, vec_fine);
+
+  DataOut<dim> data_out;
+
+  data_out.add_data_vector(dof_handler_coarse, vec_coarse, "solution_coarse");
+  data_out.add_data_vector(dof_handler_fine, vec_fine, "solution_fine");
+
+  data_out.build_patches();
+
+  static unsigned int counter = 0;
+
+#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
+}
+
+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();
+}
+
+template <int dim, typename Number>
+void
+test()
+{
+  const unsigned int fe_degree = 2;
+
+  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();
+}
+
+int
+main(int argc, char **argv)
+{
+  Utilities::MPI::MPI_InitFinalize mpi_initialization(argc, argv, 1);
+  MPILogInitAll                    all;
+
+  deallog.precision(8);
+
+  test<2, double>();
+}
diff --git a/tests/multigrid-global-coarsening/fe_nothing_01.with_p4est=true.mpirun=1.output b/tests/multigrid-global-coarsening/fe_nothing_01.with_p4est=true.mpirun=1.output
new file mode 100644
index 0000000000..0cd330fab2
--- /dev/null
+++ b/tests/multigrid-global-coarsening/fe_nothing_01.with_p4est=true.mpirun=1.output
@@ -0,0 +1,1585 @@
+
+DEAL:0:CG<->CG:0::
+# vtk DataFile Version 3.0
+#This file was generated 
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