From: Peter Munch Date: Wed, 7 Aug 2024 08:00:45 +0000 (+0200) Subject: Add DoFTools::extract_elasticity_modes() X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b40548f4036f9662865ecc12baabc7e7b07e4b94;p=dealii.git Add DoFTools::extract_elasticity_modes() --- diff --git a/doc/news/changes/minor/20240810Munch b/doc/news/changes/minor/20240810Munch new file mode 100644 index 0000000000..767fd3f103 --- /dev/null +++ b/doc/news/changes/minor/20240810Munch @@ -0,0 +1,6 @@ +New: The new functions DoFTools::extract_elasticity_modes +and DoFTools::extract_level_elasticity_modes +allow you to extract translational and rotational modes, +need to set up AMG for solving elasticity problems. +
+(Marco Feder, Peter Munch, Richard Schussnig, 2024/08/10) diff --git a/include/deal.II/dofs/dof_tools.h b/include/deal.II/dofs/dof_tools.h index 39442f70b7..a0722db5e3 100644 --- a/include/deal.II/dofs/dof_tools.h +++ b/include/deal.II/dofs/dof_tools.h @@ -1382,6 +1382,30 @@ namespace DoFTools const DoFHandler &dof_handler, const ComponentMask &component_mask, std::vector> &constant_modes); + + /** + * Same as the above but additional to the translational modes also + * the rotational modes are added, needed to set up AMG for solving + * elasticity problems. + */ + template + void + extract_elasticity_modes(const Mapping &mapping, + const DoFHandler &dof_handler, + const ComponentMask &component_mask, + std::vector> &elasticity_modes); + + /** + * Same as above but for multigrid levels. + */ + template + void + extract_level_elasticity_modes( + const unsigned int level, + const Mapping &mapping, + const DoFHandler &dof_handler, + const ComponentMask &component_mask, + std::vector> &elasticity_modes); /** @} */ /** diff --git a/include/deal.II/lac/trilinos_precondition.h b/include/deal.II/lac/trilinos_precondition.h index 2f99daa1d9..7d3c88ef39 100644 --- a/include/deal.II/lac/trilinos_precondition.h +++ b/include/deal.II/lac/trilinos_precondition.h @@ -1499,6 +1499,15 @@ namespace TrilinosWrappers */ std::vector> constant_modes; + /** + * Same as above, but with values instead of Booleans. This + * is usfule if you want to specifiy rotational modes + * in addition to the translational modes. See also: + * DoFTools::extract_elasticity_modes + * and DoFTools::extract_level_elasticity_modes. + */ + std::vector> constant_modes_values; + /** * Determines how many sweeps of the smoother should be performed. When * the flag elliptic is set to true, i.e., for diff --git a/source/dofs/dof_tools.cc b/source/dofs/dof_tools.cc index 43f51b7c9f..7bf4e2ea42 100644 --- a/source/dofs/dof_tools.cc +++ b/source/dofs/dof_tools.cc @@ -43,6 +43,8 @@ #include #include +#include + #include #include @@ -1407,6 +1409,130 @@ namespace DoFTools } }); } + + + + /** + * Definition of the rigid body motions for linear elasticity. + */ + template + class RigidBodyMotion : public Function + { + public: + static constexpr unsigned int n_modes = dim * (dim + 1) / 2; + + RigidBodyMotion(const unsigned int type); + + virtual double + value(const Point &p, const unsigned int component) const override; + + private: + const unsigned int type; + }; + + + + template + RigidBodyMotion::RigidBodyMotion(const unsigned int type) + : Function(dim) + , type(type) + { + Assert(type < n_modes, ExcNotImplemented()); + } + + + + Tensor<1, 2> + cross_product(const Tensor<1, 2> &tensor1, const Tensor<1, 1> &tensor2) + { + // |a| |0| |+bc| + // |b| x |0| = |-ac| + // |0| |c| | 0 | + + Tensor<1, 2> cproduct; + cproduct[0] = +tensor1[1] * tensor2[0]; + cproduct[1] = -tensor1[0] * tensor2[0]; + return cproduct; + } + + + + Tensor<1, 3> + cross_product(const Tensor<1, 3> &tensor1, const Tensor<1, 3> &tensor2) + { + Tensor<1, 3> cproduct; + cproduct[0] = +tensor1[1] * tensor2[2] - tensor1[2] * tensor2[1]; + cproduct[1] = +tensor1[2] * tensor2[0] - tensor1[0] * tensor2[2]; + cproduct[2] = +tensor1[0] * tensor2[1] - tensor1[1] * tensor2[0]; + return cproduct; + } + + + + template + double + RigidBodyMotion::value(const Point &p, + const unsigned int component) const + { + if (type < dim) // translation modes + return static_cast(component == type); + + if constexpr (dim >= 2) // rotation modes + { + Tensor<1, n_modes - dim> dir; + dir[type - dim] = 1.0; + + return cross_product(p, dir)[component]; + } + else + { + Assert(false, ExcNotImplemented()); + + return 0.0; + } + } + + + + template + void + extract_elasticity_modes(const Mapping &mapping, + const DoFHandler &dof_handler, + const ComponentMask &component_mask, + const unsigned int mg_level, + std::vector> &elasticity_modes) + { + AssertDimension(dim, spacedim); + AssertDimension(component_mask.n_selected_components(), dim); + + const unsigned int n_modes = RigidBodyMotion::n_modes; + + elasticity_modes.resize(n_modes); + + LinearAlgebra::distributed::Vector elasticity_modes_dealii( + mg_level == numbers::invalid_unsigned_int ? + dof_handler.locally_owned_dofs() : + dof_handler.locally_owned_mg_dofs(mg_level), + mg_level == numbers::invalid_unsigned_int ? + DoFTools::extract_locally_active_dofs(dof_handler) : + DoFTools::extract_locally_active_level_dofs(dof_handler, mg_level), + dof_handler.get_communicator()); + + for (unsigned int i = 0; i < n_modes; ++i) + { + VectorTools::interpolate(mapping, + dof_handler, + RigidBodyMotion(i), + elasticity_modes_dealii, + component_mask, + mg_level); + + // copy to right format + elasticity_modes[i].assign(elasticity_modes_dealii.begin(), + elasticity_modes_dealii.end()); + } + } + } // namespace internal @@ -1440,6 +1566,37 @@ namespace DoFTools + template + void + extract_elasticity_modes(const Mapping &mapping, + const DoFHandler &dof_handler, + const ComponentMask &component_mask, + std::vector> &constant_modes) + { + internal::extract_elasticity_modes(mapping, + dof_handler, + component_mask, + numbers::invalid_unsigned_int, + constant_modes); + } + + + + template + void + extract_level_elasticity_modes( + const unsigned int level, + const Mapping &mapping, + const DoFHandler &dof_handler, + const ComponentMask &component_mask, + std::vector> &constant_modes) + { + internal::extract_elasticity_modes( + mapping, dof_handler, component_mask, level, constant_modes); + } + + + template std::map::active_cell_iterator, std::pair::active_cell_iterator, diff --git a/source/dofs/dof_tools.inst.in b/source/dofs/dof_tools.inst.in index b891f1f3a1..30732c63dd 100644 --- a/source/dofs/dof_tools.inst.in +++ b/source/dofs/dof_tools.inst.in @@ -199,6 +199,19 @@ for (deal_II_dimension : DIMENSIONS) const ComponentMask &selected_components, std::vector> &constant_modes); + template void DoFTools::extract_elasticity_modes( + const Mapping &mapping, + const DoFHandler &dof_handler, + const ComponentMask &selected_components, + std::vector> &constant_modes); + + template void DoFTools::extract_level_elasticity_modes( + const unsigned int level, + const Mapping &mapping, + const DoFHandler &dof_handler, + const ComponentMask &selected_components, + std::vector> &constant_modes); + template void DoFTools::get_active_fe_indices( const DoFHandler &dof_handler, std::vector &active_fe_indices); diff --git a/source/lac/trilinos_precondition_ml.cc b/source/lac/trilinos_precondition_ml.cc index 903b3392d5..af3c801540 100644 --- a/source/lac/trilinos_precondition_ml.cc +++ b/source/lac/trilinos_precondition_ml.cc @@ -128,57 +128,70 @@ namespace TrilinosWrappers std::unique_ptr &ptr_distributed_constant_modes, const Epetra_RowMatrix &matrix) const { - const Epetra_Map &domain_map = matrix.OperatorDomainMap(); - - const size_type constant_modes_dimension = constant_modes.size(); - ptr_distributed_constant_modes = std::make_unique( - domain_map, constant_modes_dimension > 0 ? constant_modes_dimension : 1); - Assert(ptr_distributed_constant_modes, ExcNotInitialized()); - Epetra_MultiVector &distributed_constant_modes = - *ptr_distributed_constant_modes; - - if (constant_modes_dimension > 0) + const auto run = [&](const auto &constant_modes) { + const Epetra_Map &domain_map = matrix.OperatorDomainMap(); + + const size_type constant_modes_dimension = constant_modes.size(); + ptr_distributed_constant_modes = + std::make_unique(domain_map, + constant_modes_dimension > 0 ? + constant_modes_dimension : + 1); + Assert(ptr_distributed_constant_modes, ExcNotInitialized()); + Epetra_MultiVector &distributed_constant_modes = + *ptr_distributed_constant_modes; + + if (constant_modes_dimension > 0) + { + const size_type global_size = TrilinosWrappers::n_global_rows(matrix); + (void)global_length; // work around compiler warning about unused + // function in release mode + Assert(global_size == + static_cast(TrilinosWrappers::global_length( + distributed_constant_modes)), + ExcDimensionMismatch(global_size, + TrilinosWrappers::global_length( + distributed_constant_modes))); + const bool constant_modes_are_global = + constant_modes[0].size() == global_size; + const size_type my_size = domain_map.NumMyElements(); + + // Reshape null space as a contiguous vector of doubles so that + // Trilinos can read from it. + const size_type expected_mode_size = + constant_modes_are_global ? global_size : my_size; + for (size_type d = 0; d < constant_modes_dimension; ++d) + { + Assert(constant_modes[d].size() == expected_mode_size, + ExcDimensionMismatch(constant_modes[d].size(), + expected_mode_size)); + for (size_type row = 0; row < my_size; ++row) + { + const TrilinosWrappers::types::int_type mode_index = + constant_modes_are_global ? + TrilinosWrappers::global_index(domain_map, row) : + row; + distributed_constant_modes[d][row] = + static_cast(constant_modes[d][mode_index]); + } + } + (void)expected_mode_size; + + parameter_list.set("null space: type", "pre-computed"); + parameter_list.set("null space: dimension", + distributed_constant_modes.NumVectors()); + parameter_list.set("null space: vectors", + distributed_constant_modes.Values()); + } + }; + + if (!constant_modes_values.empty()) { - const size_type global_size = TrilinosWrappers::n_global_rows(matrix); - (void)global_length; // work around compiler warning about unused - // function in release mode - Assert(global_size == - static_cast( - TrilinosWrappers::global_length(distributed_constant_modes)), - ExcDimensionMismatch(global_size, - TrilinosWrappers::global_length( - distributed_constant_modes))); - const bool constant_modes_are_global = - constant_modes[0].size() == global_size; - const size_type my_size = domain_map.NumMyElements(); - - // Reshape null space as a contiguous vector of doubles so that - // Trilinos can read from it. - const size_type expected_mode_size = - constant_modes_are_global ? global_size : my_size; - for (size_type d = 0; d < constant_modes_dimension; ++d) - { - Assert(constant_modes[d].size() == expected_mode_size, - ExcDimensionMismatch(constant_modes[d].size(), - expected_mode_size)); - for (size_type row = 0; row < my_size; ++row) - { - const TrilinosWrappers::types::int_type mode_index = - constant_modes_are_global ? - TrilinosWrappers::global_index(domain_map, row) : - row; - distributed_constant_modes[d][row] = - static_cast(constant_modes[d][mode_index]); - } - } - (void)expected_mode_size; - - parameter_list.set("null space: type", "pre-computed"); - parameter_list.set("null space: dimension", - distributed_constant_modes.NumVectors()); - parameter_list.set("null space: vectors", - distributed_constant_modes.Values()); + AssertDimension(constant_modes.size(), 0); + run(constant_modes_values); } + else + run(constant_modes); } diff --git a/tests/mpi/extract_constant_modes_05.cc b/tests/mpi/extract_constant_modes_05.cc new file mode 100644 index 0000000000..70b738e406 --- /dev/null +++ b/tests/mpi/extract_constant_modes_05.cc @@ -0,0 +1,87 @@ +// ------------------------------------------------------------------------ +// +// 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. +// +// ------------------------------------------------------------------------ + + + +// test DoFTools::extract_elasticity_modes + +#include + +#include + +#include +#include +#include +#include + +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#include "../tests.h" + + + +template +void +test() +{ + unsigned int myid = Utilities::MPI::this_mpi_process(MPI_COMM_WORLD); + parallel::distributed::Triangulation tr(MPI_COMM_WORLD); + GridGenerator::subdivided_hyper_cube(tr, 2); + + MappingQ1 mapping; + + FESystem fe(FE_Q(1), dim); + DoFHandler dofh(tr); + dofh.distribute_dofs(fe); + + deallog << "Total dofs=" << dofh.n_dofs() << std::endl; + + // extract constant modes and print + ComponentMask mask(fe.n_components(), true); + + std::vector> constant_modes; + DoFTools::extract_elasticity_modes(mapping, dofh, mask, constant_modes); + + for (unsigned int i = 0; i < constant_modes.size(); ++i) + { + for (unsigned int j = 0; j < constant_modes[i].size(); ++j) + deallog << constant_modes[i][j] << ' '; + deallog << std::endl; + } +} + + +int +main(int argc, char *argv[]) +{ + Utilities::MPI::MPI_InitFinalize mpi_initialization(argc, argv, 1); + MPILogInitAll log; + + deallog.push("2d"); + test<2>(); + deallog.pop(); + + deallog.push("3d"); + test<3>(); + deallog.pop(); +} diff --git a/tests/mpi/extract_constant_modes_05.mpirun=4.with_p4est=true.output b/tests/mpi/extract_constant_modes_05.mpirun=4.with_p4est=true.output new file mode 100644 index 0000000000..7d870e34b6 --- /dev/null +++ b/tests/mpi/extract_constant_modes_05.mpirun=4.with_p4est=true.output @@ -0,0 +1,51 @@ + +DEAL:0:2d::Total dofs=18 +DEAL:0:2d::1.00000 0.00000 1.00000 0.00000 1.00000 0.00000 1.00000 0.00000 +DEAL:0:2d::0.00000 1.00000 0.00000 1.00000 0.00000 1.00000 0.00000 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b/tests/mpi/extract_constant_modes_06.cc new file mode 100644 index 0000000000..660eed0e95 --- /dev/null +++ b/tests/mpi/extract_constant_modes_06.cc @@ -0,0 +1,92 @@ +// ------------------------------------------------------------------------ +// +// 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. +// +// ------------------------------------------------------------------------ + + + +// test DoFTools::extract_level_elasticity_modes + +#include + +#include + +#include +#include +#include +#include + +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#include "../tests.h" + + + +template +void +test() +{ + unsigned int myid = Utilities::MPI::this_mpi_process(MPI_COMM_WORLD); + parallel::distributed::Triangulation tr( + MPI_COMM_WORLD, + Triangulation::none, + parallel::distributed::Triangulation::construct_multigrid_hierarchy); + GridGenerator::subdivided_hyper_cube(tr, 2); + + MappingQ1 mapping; + + FESystem fe(FE_Q(1), dim); + DoFHandler dofh(tr); + dofh.distribute_dofs(fe); + dofh.distribute_mg_dofs(); + + deallog << "Total dofs=" << dofh.n_dofs() << std::endl; + + // extract constant modes and print + ComponentMask mask(fe.n_components(), true); + + std::vector> constant_modes; + DoFTools::extract_level_elasticity_modes( + 0, mapping, dofh, mask, constant_modes); + + for (unsigned int i = 0; i < constant_modes.size(); ++i) + { + for (unsigned int j = 0; j < constant_modes[i].size(); ++j) + deallog << constant_modes[i][j] << ' '; + deallog << std::endl; + } +} + + +int +main(int argc, char *argv[]) +{ + Utilities::MPI::MPI_InitFinalize mpi_initialization(argc, argv, 1); + MPILogInitAll log; + + deallog.push("2d"); + test<2>(); + deallog.pop(); + + deallog.push("3d"); + test<3>(); + deallog.pop(); +} diff --git a/tests/mpi/extract_constant_modes_06.mpirun=4.with_p4est=true.output b/tests/mpi/extract_constant_modes_06.mpirun=4.with_p4est=true.output new file mode 100644 index 0000000000..7d870e34b6 --- /dev/null +++ b/tests/mpi/extract_constant_modes_06.mpirun=4.with_p4est=true.output @@ -0,0 +1,51 @@ + +DEAL:0:2d::Total dofs=18 +DEAL:0:2d::1.00000 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