218 lines
9.3 KiB
C++
218 lines
9.3 KiB
C++
#include <catch2/catch_test_macros.hpp>
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#include <catch2/matchers/catch_matchers_floating_point.hpp>
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#include <cmath>
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#include <mfem.hpp>
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#include <stdexcept>
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import mean_field;
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import test_helpers;
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using namespace mean_field;
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using Catch::Matchers::WithinAbs;
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namespace prepared_test = gravity_prepared_test_utils;
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namespace {
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[[nodiscard]] mfem::Vector make_folding_displacement(const mean_field::fem::FEM &f) {
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mfem::ParGridFunction field(f.displacementFes.get());
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mfem::VectorFunctionCoefficient coefficient(
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f.mesh->Dimension(), [](const mfem::Vector &position, mfem::Vector &value) {
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value.SetSize(position.Size());
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for (int dimension = 0; dimension < position.Size(); ++dimension) {
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value(dimension) = -2.0 * position(dimension);
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}
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}
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);
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field.ProjectCoefficient(coefficient);
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mfem::Vector displacementTrue;
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field.GetTrueDofs(displacementTrue);
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return displacementTrue;
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}
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} // namespace
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TEST_CASE(
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"Prepared Mapped Hdiv Mass Reports Invalid Candidate Geometry Without Unwinding",
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tags::gravity_prepared_unit &tags::geometry
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) {
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auto args = test_utils::setup_args();
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fem::FEM f = fem::setup_fem(args.mesh_file, args, 0);
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REQUIRE(f.okay());
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operators::PreparedMappedHDivMassOperator preparedOperator(f, *f.domainMapperStateless);
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mfem::Vector displacement = preparedOperator.GetDisplacementMap().gather(make_folding_displacement(f));
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const auto rejected = preparedOperator.TryPrepare(displacement);
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REQUIRE_FALSE(rejected.has_value());
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CHECK(rejected.error().reason == operators::HDivMassPreparationRejectionReason::invalid_mapping);
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CHECK(rejected.error().mappingStatus == mapping::MappingStatus::non_positive_determinant);
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CHECK_FALSE(preparedOperator.IsPrepared());
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CHECK_FALSE(preparedOperator.HasVariationData());
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CHECK(preparedOperator.GetPreparationCount() == 0);
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CHECK_THROWS_AS(preparedOperator.Prepare(displacement), std::domain_error);
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CHECK_FALSE(preparedOperator.IsPrepared());
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CHECK(preparedOperator.GetPreparationCount() == 0);
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displacement = 0.0;
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const auto recovered = preparedOperator.TryPrepare(displacement);
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REQUIRE(recovered.has_value());
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CHECK(preparedOperator.IsPrepared());
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CHECK(preparedOperator.HasVariationData());
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CHECK(preparedOperator.GetPreparationCount() == 1);
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}
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TEST_CASE(
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"Prepared Mapped Hdiv Mass Matches Stateless Kernel",
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tags::gravity_prepared
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) {
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auto args = test_utils::setup_args();
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fem::FEM f = fem::setup_fem(args.mesh_file, args, 0);
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operators::PreparedMappedHDivMassOperator prepared_operator(f, *f.domainMapperStateless);
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REQUIRE(prepared_operator.Width() == prepared_operator.GetFluxMap().reduced_size());
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REQUIRE(prepared_operator.Height() == prepared_operator.GetFluxMap().reduced_size());
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const mfem::Vector gravity_gradient_true =
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prepared_test::make_deterministic_vector(f.gravityFluxFes->GetTrueVSize(), 0.21);
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const mfem::Vector gravity_gradient = prepared_operator.GetFluxMap().gather(gravity_gradient_true);
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const MPI_Comm communicator = f.gravityFluxFes->GetComm();
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mfem::Vector identity_action;
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mfem::Vector deformed_action;
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for (const double deformation_scale : {0.0, 1.0}) {
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const mfem::Vector displacement_true = prepared_test::make_displacement(f, deformation_scale);
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const mfem::Vector displacement = prepared_operator.GetDisplacementMap().gather(displacement_true);
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prepared_operator.Prepare(displacement);
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mfem::Vector prepared_action;
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prepared_operator.Mult(gravity_gradient, prepared_action);
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mfem::Vector reference_action_true;
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operators::kernels::apply_mapped_hdiv_mass(
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f, *f.domainMapperStateless, gravity_gradient_true, displacement_true, reference_action_true
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);
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const mfem::Vector reference_action = prepared_operator.GetFluxMap().gather(reference_action_true);
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const double relative_error = prepared_test::relative_error(prepared_action, reference_action, communicator);
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INFO("Deformation scale = " << deformation_scale);
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INFO("Prepared action norm = " << prepared_test::global_norm(prepared_action, communicator));
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INFO("Reference action norm = " << prepared_test::global_norm(reference_action, communicator));
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INFO("Relative prepared-operator error = " << relative_error);
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REQUIRE(prepared_operator.IsPrepared());
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CHECK_THAT(relative_error, WithinAbs(0.0, 2.0e-11));
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if (deformation_scale == 0.0) {
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identity_action = prepared_action;
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} else {
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deformed_action = prepared_action;
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}
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}
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const double geometry_change = prepared_test::relative_error(deformed_action, identity_action, communicator);
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INFO("Relative action change under deformation = " << geometry_change);
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CHECK(prepared_operator.GetPreparationCount() == 2);
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CHECK(geometry_change > 1.0e-5);
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}
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TEST_CASE(
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"Prepared Mapped Hdiv Mass Preserves Operator Identities",
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tags::gravity_prepared
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) {
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auto args = test_utils::setup_args();
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fem::FEM f = fem::setup_fem(args.mesh_file, args, 0);
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operators::PreparedMappedHDivMassOperator prepared_operator(f, *f.domainMapperStateless);
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REQUIRE(prepared_operator.Width() == prepared_operator.GetFluxMap().reduced_size());
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REQUIRE(prepared_operator.Height() == prepared_operator.GetFluxMap().reduced_size());
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const mfem::Vector displacement =
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prepared_operator.GetDisplacementMap().gather(prepared_test::make_displacement(f, 1.0));
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prepared_operator.Prepare(displacement);
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const mfem::Vector first = prepared_operator.GetFluxMap().gather(
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prepared_test::make_deterministic_vector(f.gravityFluxFes->GetTrueVSize(), 0.17)
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);
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const mfem::Vector second = prepared_operator.GetFluxMap().gather(
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prepared_test::make_deterministic_vector(f.gravityFluxFes->GetTrueVSize(), 0.83)
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);
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const mfem::Vector combination = prepared_test::linear_combination(first, 1.7, second, -0.4);
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mfem::Vector first_action;
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mfem::Vector second_action;
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mfem::Vector combination_action;
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mfem::Vector zero_action;
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prepared_operator.Mult(first, first_action);
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prepared_operator.Mult(second, second_action);
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prepared_operator.Mult(combination, combination_action);
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mfem::Vector expected_combination = prepared_test::linear_combination(first_action, 1.7, second_action, -0.4);
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mfem::Vector zero(first.Size());
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zero = 0.0;
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prepared_operator.Mult(zero, zero_action);
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const MPI_Comm communicator = f.gravityFluxFes->GetComm();
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const double first_second_product = prepared_test::global_dot(first, second_action, communicator);
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const double second_first_product = prepared_test::global_dot(second, first_action, communicator);
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const double symmetry_error = prepared_test::relative_scalar_error(first_second_product, second_first_product);
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const double linearity_error =
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prepared_test::relative_error(combination_action, expected_combination, communicator);
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const double first_energy = prepared_test::global_dot(first, first_action, communicator);
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const double second_energy = prepared_test::global_dot(second, second_action, communicator);
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const std::uint64_t preparation_count = prepared_operator.GetPreparationCount();
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mfem::Vector repeated_action;
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prepared_operator.Mult(first, repeated_action);
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INFO("u^T M v = " << first_second_product);
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INFO("v^T M u = " << second_first_product);
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INFO("Relative symmetry error = " << symmetry_error);
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INFO("Relative linearity error = " << linearity_error);
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INFO("u^T M u = " << first_energy);
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INFO("v^T M v = " << second_energy);
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CHECK_THAT(symmetry_error, WithinAbs(0.0, 2.0e-12));
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CHECK_THAT(linearity_error, WithinAbs(0.0, 2.0e-12));
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CHECK_THAT(prepared_test::global_norm(zero_action, communicator), WithinAbs(0.0, 1.0e-14));
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CHECK(first_energy > 0.0);
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CHECK(second_energy > 0.0);
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CHECK(prepared_test::relative_error(repeated_action, first_action, communicator) < 2.0e-14);
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CHECK(prepared_operator.GetPreparationCount() == preparation_count);
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}
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TEST_CASE(
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"Prepared Mapped Hdiv Mass Diagonal Is Positive Across Both Domains",
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tags::gravity_prepared
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) {
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auto args = test_utils::setup_args();
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fem::FEM f = fem::setup_fem(args.mesh_file, args, 0);
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operators::PreparedMappedHDivMassOperator prepared_operator(f, *f.domainMapperStateless);
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const mfem::Vector displacement =
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prepared_operator.GetDisplacementMap().gather(prepared_test::make_displacement(f, 1.0));
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prepared_operator.Prepare(displacement);
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mfem::Vector diagonal;
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mfem::Vector true_diagonal;
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prepared_operator.AssembleDiagonal(diagonal);
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prepared_operator.AssembleTrueDiagonal(true_diagonal);
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REQUIRE(diagonal.Size() == prepared_operator.Height());
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REQUIRE(true_diagonal.Size() == prepared_operator.GetFluxMap().full_size());
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const mfem::Vector gathered_true_diagonal = prepared_operator.GetFluxMap().gather(true_diagonal);
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for (int i = 0; i < diagonal.Size(); ++i) {
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REQUIRE(std::isfinite(diagonal(i)));
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CHECK(diagonal(i) > 0.0);
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CHECK_THAT(diagonal(i), WithinAbs(gathered_true_diagonal(i), 1.0e-14 * std::abs(diagonal(i))));
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}
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}
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