From 99d269620f14e9dff2d2233b9350375cab133158 Mon Sep 17 00:00:00 2001 From: Luca Heltai Date: Fri, 1 May 2020 16:58:48 +0200 Subject: [PATCH] Allow filenames and cad files. --- examples/step-70/step-70.cc | 249 ++++++++++++++++++++---------------- 1 file changed, 139 insertions(+), 110 deletions(-) diff --git a/examples/step-70/step-70.cc b/examples/step-70/step-70.cc index d9594d2a37..9f99c90787 100644 --- a/examples/step-70/step-70.cc +++ b/examples/step-70/step-70.cc @@ -68,6 +68,7 @@ namespace LA #include #include +#include #include #include #include @@ -126,9 +127,16 @@ namespace LA #include #include -// For non-matching co-dimension one surfaces, we use a special quadrature -// formula, that allows one to compute integrals on immersed surfaces -#include +// When generating the grids, we allow reading it from a file, and if deal.II +// has been built with OpenCASCADE support, we allow reading also cad files and +// use them as manifold descriptors for the grid (see step-54 for a detailed +// description of the various Manifold descriptors that are available in the +// OpenCASCADE namespace) +#include +#include +#ifdef DEAL_II_WITH_OPENCASCADE +# include +#endif #include #include @@ -317,10 +325,10 @@ namespace Step70 // the CAD file itself. // // We do this for each of the generated grids, to be as generic as possible: - std::string name_of_grid1 = "hyper_cube"; - std::string arguments_for_grid1 = "-1: 1: false"; - std::string name_of_grid2 = "hyper_rectangle"; - std::string arguments_for_grid2 = + std::string name_of_fluid_grid = "hyper_cube"; + std::string arguments_for_fluid_grid = "-1: 1: false"; + std::string name_of_solid_grid = "hyper_rectangle"; + std::string arguments_for_solid_grid = dim == 2 ? "-.5, -.1: .5, .1: false" : "-.5, -.1, -.1: .5, .1, .1: false"; std::string name_of_particle_grid = "hyper_ball"; std::string arguments_for_particle_grid = @@ -644,21 +652,112 @@ namespace Step70 {} + // In order to generate the grid, we first try to use the functions in the + // deal.II GridGenerator namespace, by leveraging the + // GridGenerator::generate_from_name_and_argument(), if this function fails, + // then we use the following method, where the name is interpreted as a + // filename, and the arguments are interpreted as a map from manifold ids to + // CAD files, and are converted to Manifold descriptors using the OpenCASCADE + // namespace facilities: + template + void read_grid_and_cad_files(const std::string &grid_file_name, + const std::string &ids_and_cad_file_names, + Triangulation &tria) + { + // Try to read the grid using GridIn facilities. Let the GridIn class + // automatically detect the file format: + GridIn grid_in; + grid_in.attach_triangulation(tria); + grid_in.read(grid_file_name); + + // If we got to this point, then the Triangulation has been read, and we are + // ready to attach to it the correct manifold descriptions. We perform the + // next lines of codes only if deal.II has been built with OpenCASCADE + // support. For each entry in the map, we try to open the corresponding CAD + // file, we analyse it, and according to its content, opt for either a + // ArchLengthProjectionLineManifold (if the CAD file contains a single + // TopoDS_Edge or a single TopoDS_Wire) or a NURBSPatchManifold, if the file + // contains a single face. Notice that if the CAD files do not contain + // single wires, edges, or faces, an assertion will be throw in the + // generation of the Manifold. + // + // We use the Patterns::Tools::Convert class to do the convertion from the + // string to a map between manifold ids and file names for us: + +#ifdef DEAL_II_WITH_OPENCASCADE + using map_type = std::map; + using Converter = Patterns::Tools::Convert; - // In this method, we show how to use the - // GridGenerator::generate_from_name_and_arguments() method to initialize the - // grids. Since both the name of the function and the grids + for (const auto pair : Converter::to_value(ids_and_cad_file_names)) + { + const auto &manifold_id = pair.first; + const auto &cad_file_name = pair.second; + + const auto extension = boost::algorithm::to_lower_copy( + cad_file_name.substr(cad_file_name.find_last_of('.') + 1)); + + TopoDS_Shape shape; + if (extension == "iges" || extension == "igs") + shape = OpenCASCADE::read_IGES(cad_file_name); + else if (extension == "step" || extension == "stp") + shape = OpenCASCADE::read_STEP(cad_file_name); + else + AssertThrow(false, + ExcNotImplemented("We found an extension that we " + "do not recognize as a CAD file " + "extension. Bailing out.")); + + // Now we check how many faces are contained in the Shape. OpenCASCADE + // is intrinsically 3D, so if this number is nonzero If the number is + // zero, we interpret this as a line manifold, otherwise as a + // NURBSPatchManifold + const auto n_elements = OpenCASCADE::count_elements(shape); + if ((std::get<0>(n_elements) == 0 && spacedim == 3)) + tria.set_manifold( + manifold_id, + OpenCASCADE::ArclengthProjectionLineManifold(shape)); + else + tria.set_manifold(manifold_id, + OpenCASCADE::NURBSPatchManifold( + TopoDS::Face(shape))); + } +#else + (void)ids_and_cad_file_names; +#endif + } + + // Now let's put things together template void StokesImmersedProblem::make_grid() { - GridGenerator::generate_from_name_and_arguments(fluid_tria, - par.name_of_grid1, - par.arguments_for_grid1); + try + { + // we first try to generate the grid internally + GridGenerator::generate_from_name_and_arguments( + fluid_tria, par.name_of_fluid_grid, par.arguments_for_fluid_grid); + } + catch (...) + { + // and if we fail, we proceed with the above function call + read_grid_and_cad_files(par.name_of_fluid_grid, + par.arguments_for_fluid_grid, + fluid_tria); + } fluid_tria.refine_global(par.initial_fluid_refinement); - GridGenerator::generate_from_name_and_arguments(solid_tria, - par.name_of_grid2, - par.arguments_for_grid2); + // The same is done for the solid grid: + try + { + GridGenerator::generate_from_name_and_arguments( + solid_tria, par.name_of_solid_grid, par.arguments_for_solid_grid); + } + catch (...) + { + read_grid_and_cad_files(par.name_of_solid_grid, + par.arguments_for_solid_grid, + solid_tria); + } + solid_tria.refine_global(par.initial_solid_refinement); } @@ -1049,105 +1148,35 @@ namespace Step70 Assert(pic.begin() == particle, ExcInternalError()); - if (dim == spacedim) - for (const auto &p : pic) - { - const auto ref_q = p.get_reference_location(); - const auto real_q = p.get_location(); - const auto properties = p.get_properties(); - const auto &JxW = properties[0]; - for (unsigned int i = 0; i < fluid_fe->dofs_per_cell; ++i) - { - const auto comp_i = - fluid_fe->system_to_component_index(i).first; - if (comp_i < spacedim) - { - for (unsigned int j = 0; j < fluid_fe->dofs_per_cell; ++j) - { - const auto comp_j = - fluid_fe->system_to_component_index(j).first; - if (comp_i == comp_j) - local_matrix(i, j) += - k * par.penalty_term * - fluid_fe->shape_value(i, ref_q) * - fluid_fe->shape_value(j, ref_q) * JxW; - } - local_rhs(i) += k * par.penalty_term * - solid_velocity.value(real_q, comp_i) * - fluid_fe->shape_value(i, ref_q) * JxW; - } - } - } - else if (dim == spacedim - 1) + for (const auto &p : pic) { - NonMatching::ImmersedSurfaceQuadrature surface_quadrature; - std::vector> quadrature_points; - for (const auto &p : pic) + const auto ref_q = p.get_reference_location(); + const auto real_q = p.get_location(); + const auto properties = p.get_properties(); + const auto &JxW = properties[0]; + for (unsigned int i = 0; i < fluid_fe->dofs_per_cell; ++i) { - const auto ref_q = p.get_reference_location(); - const auto properties = p.get_properties(); - const auto & JxW = properties[0]; - Tensor<1, spacedim> normal; - for (unsigned int i = 0; i < spacedim; ++i) - normal[i] = properties[i + 1]; - - surface_quadrature.push_back(ref_q, JxW, normal); - quadrature_points.push_back(p.get_location()); - } - - FEValues fe_values(*fluid_fe, - surface_quadrature, - update_values | update_gradients); - - fe_values.reinit(cell); - - for (unsigned int q_point = 0; q_point < surface_quadrature.size(); - ++q_point) - { - const auto &normal_vector = - surface_quadrature.normal_vector(q_point); - const auto &JxW = surface_quadrature.weight(q_point); - - for (unsigned int i = 0; i < fluid_fe->dofs_per_cell; ++i) + const auto comp_i = + fluid_fe->system_to_component_index(i).first; + if (comp_i < spacedim) { - const auto grad_phi = - fe_values[velocities].gradient(i, q_point); - const auto phi = fe_values[velocities].value(i, q_point); - const auto q = fe_values[pressure].value(i, q_point); - for (unsigned int j = 0; j < fluid_fe->dofs_per_cell; ++j) { - const auto grad_u = - fe_values[velocities].gradient(j, q_point); - const auto u = fe_values[velocities].value(j, q_point); - const auto p = fe_values[pressure].value(j, q_point); - - local_matrix(i, j) += - ((-grad_phi * normal_vector + q * normal_vector) * u + - (-grad_u * normal_vector + p * normal_vector) * phi + - k * par.penalty_term * u * phi) * - JxW; + const auto comp_j = + fluid_fe->system_to_component_index(j).first; + if (comp_i == comp_j) + local_matrix(i, j) += + k * par.penalty_term * + fluid_fe->shape_value(i, ref_q) * + fluid_fe->shape_value(j, ref_q) * JxW; } - const auto comp_i = - fluid_fe->system_to_component_index(i).first; - - Tensor<1, spacedim> g; - if (comp_i < spacedim) - g[comp_i] = - solid_velocity.value(quadrature_points[q_point], - comp_i); - - local_rhs(i) += - ((-grad_phi * normal_vector + q * normal_vector) * g + - k * par.penalty_term * g * phi) * - JxW; + local_rhs(i) += k * par.penalty_term * + solid_velocity.value(real_q, comp_i) * + fluid_fe->shape_value(i, ref_q) * JxW; } } } - else - { - Assert(false, ExcNotImplemented()); - } + constraints.distribute_local_to_global(local_matrix, local_rhs, fluid_dof_indices, @@ -1505,13 +1534,13 @@ namespace Step70 // passive tracers. enter_my_subsection(this->prm); this->prm.enter_subsection("Grid generation"); - this->prm.add_parameter("Grid one generator", name_of_grid1); + this->prm.add_parameter("Grid one generator", name_of_fluid_grid); this->prm.add_parameter("Grid one generator arguments", - arguments_for_grid1); + arguments_for_fluid_grid); - this->prm.add_parameter("Grid two generator", name_of_grid2); + this->prm.add_parameter("Grid two generator", name_of_solid_grid); this->prm.add_parameter("Grid two generator arguments", - arguments_for_grid2); + arguments_for_solid_grid); this->prm.add_parameter("Particle grid generator", name_of_particle_grid); this->prm.add_parameter("Particle grid generator arguments", -- 2.39.5