From fa08d999ddfc950de720e2c724092d587bb624ea Mon Sep 17 00:00:00 2001
From: Tileuzhan Mukhamet <tileuzhan.mukhamet@rub.de>
Date: Tue, 10 Dec 2024 09:35:04 +0100
Subject: [PATCH] add test mpi periodicity_09.cc

---
 tests/mpi/periodicity_09.cc                   | 176 ++++++++++++++++++
 ...odicity_09.mpirun=5.with_p4est=true.output |   3 +
 2 files changed, 179 insertions(+)
 create mode 100644 tests/mpi/periodicity_09.cc
 create mode 100644 tests/mpi/periodicity_09.mpirun=5.with_p4est=true.output

diff --git a/tests/mpi/periodicity_09.cc b/tests/mpi/periodicity_09.cc
new file mode 100644
index 0000000000..7b479901be
--- /dev/null
+++ b/tests/mpi/periodicity_09.cc
@@ -0,0 +1,176 @@
+// ------------------------------------------------------------------------
+//
+// SPDX-License-Identifier: LGPL-2.1-or-later
+// Copyright (C) 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.
+//
+// ------------------------------------------------------------------------
+
+// The program attempts to create periodicity constraints when DoFHandler
+// object carries FE_RaviartThomas element which does not provide
+// get_subface_interpolation() method. See also pull-request
+// Periodicity constraints: skip artificial cell face dofs #17918
+
+#include <deal.II/base/conditional_ostream.h>
+#include <deal.II/base/index_set.h>
+#include <deal.II/base/utilities.h>
+
+#include <deal.II/distributed/grid_refinement.h>
+#include <deal.II/distributed/tria.h>
+
+#include <deal.II/dofs/dof_handler.h>
+#include <deal.II/dofs/dof_tools.h>
+
+#include <deal.II/fe/fe_raviart_thomas.h>
+#include <deal.II/fe/fe_system.h>
+
+#include <deal.II/grid/grid_generator.h>
+#include <deal.II/grid/grid_out.h>
+#include <deal.II/grid/grid_refinement.h>
+#include <deal.II/grid/grid_tools.h>
+
+#include <deal.II/lac/generic_linear_algebra.h>
+#include <deal.II/lac/sparsity_tools.h>
+
+#include "../tests.h"
+
+using namespace dealii;
+
+// define boundaries for convenience
+namespace Boundaries
+{
+  constexpr types::boundary_id lower_x = 0;
+  constexpr types::boundary_id upper_x = 1;
+  constexpr types::boundary_id lower_y = 2;
+  constexpr types::boundary_id upper_y = 3;
+  constexpr types::boundary_id lower_z = 4;
+  constexpr types::boundary_id upper_z = 5;
+} // namespace Boundaries
+
+
+int
+main(int argc, char *argv[])
+{
+  dealii::Utilities::MPI::MPI_InitFinalize mpi_initialization(argc, argv, 1);
+
+  mpi_initlog();
+
+  constexpr unsigned int dim           = 2;
+  constexpr unsigned int degree        = 1;
+  unsigned int           n_refinements = 3;
+
+  using namespace dealii;
+
+  using Number = double;
+
+  MPI_Comm mpi_communicator(MPI_COMM_WORLD);
+
+  ConditionalOStream pcout(
+    std::cout, (Utilities::MPI::this_mpi_process(mpi_communicator) == 0));
+
+  parallel::distributed::Triangulation<dim> triangulation(mpi_communicator);
+
+  // setup grid, in this case rectangle as example
+  {
+    Point<dim, Number> lower;
+    Point<dim, Number> upper;
+    for (unsigned int i = 0; i < dim; ++i)
+      {
+        lower[i] = -1.0;
+        upper[i] = 1.0;
+      }
+    GridGenerator::hyper_rectangle(triangulation, lower, upper, true);
+  }
+
+  // add periodic boundary information to the triangulation
+  {
+    std::vector<GridTools::PeriodicFacePair<
+      typename parallel::distributed::Triangulation<dim>::cell_iterator>>
+      periodicity_vector;
+
+    // identify face pairs in x-direction
+    GridTools::collect_periodic_faces(triangulation,
+                                      Boundaries::lower_x,
+                                      Boundaries::upper_x,
+                                      0,
+                                      periodicity_vector);
+
+    // identify face pairs in y-direction
+    GridTools::collect_periodic_faces(triangulation,
+                                      Boundaries::lower_y,
+                                      Boundaries::upper_y,
+                                      1,
+                                      periodicity_vector);
+
+    if (dim == 3)
+      {
+        // identify face pairs in z-direction
+        GridTools::collect_periodic_faces(triangulation,
+                                          Boundaries::lower_z,
+                                          Boundaries::upper_z,
+                                          2,
+                                          periodicity_vector);
+      }
+    triangulation.add_periodicity(periodicity_vector);
+
+    triangulation.refine_global(n_refinements);
+  }
+
+  DoFHandler<dim> dof_handler(triangulation);
+
+  FESystem<dim, dim> fe(FE_RaviartThomas<dim>(degree), 1);
+
+  dof_handler.distribute_dofs(fe);
+
+  IndexSet locally_owned_dofs;
+  IndexSet locally_relevant_dofs;
+
+  locally_owned_dofs    = dof_handler.locally_owned_dofs();
+  locally_relevant_dofs = DoFTools::extract_locally_relevant_dofs(dof_handler);
+
+  AffineConstraints<Number> constraints;
+
+  constraints.clear();
+  constraints.reinit(locally_owned_dofs, locally_relevant_dofs);
+
+
+  // setup periodic boundary conditions
+  {
+    std::vector<
+      GridTools::PeriodicFacePair<typename DoFHandler<dim>::cell_iterator>>
+      matched_pairs;
+
+    // identify face pairs in x-direction
+    GridTools::collect_periodic_faces(
+      dof_handler, Boundaries::lower_x, Boundaries::upper_x, 0, matched_pairs);
+
+    // identify face pairs in y-direction
+    GridTools::collect_periodic_faces(
+      dof_handler, Boundaries::lower_y, Boundaries::upper_y, 1, matched_pairs);
+
+
+    // identify face pairs in z-direction
+    if (dim == 3)
+      {
+        GridTools::collect_periodic_faces(dof_handler,
+                                          Boundaries::lower_z,
+                                          Boundaries::upper_z,
+                                          2,
+                                          matched_pairs);
+      }
+
+    deallog << "Attempting to make constraints" << std::endl;
+
+    DoFTools::make_periodicity_constraints<dim, dim>(matched_pairs,
+                                                     constraints);
+    constraints.close();
+  }
+
+  deallog << "The test completed successfully!" << std::endl;
+}
diff --git a/tests/mpi/periodicity_09.mpirun=5.with_p4est=true.output b/tests/mpi/periodicity_09.mpirun=5.with_p4est=true.output
new file mode 100644
index 0000000000..39f4e67ea7
--- /dev/null
+++ b/tests/mpi/periodicity_09.mpirun=5.with_p4est=true.output
@@ -0,0 +1,3 @@
+
+DEAL::Attempting to make constraints
+DEAL::The test completed successfully!
-- 
2.39.5