MeshFunctionTest Class Reference

Inheritance diagram for MeshFunctionTest:

Public Member Functions
	CPPUNIT_TEST_SUITE (MeshFunctionTest)
	Tests for general MeshFunction capability. More...
	CPPUNIT_TEST (test_p_level)
	CPPUNIT_TEST_SUITE_END ()
void	setUp ()
void	tearDown ()
void	test_p_level ()

Detailed Description

Definition at line 27 of file mesh_function.C.

Member Function Documentation

CPPUNIT_TEST()

MeshFunctionTest::CPPUNIT_TEST

(

test_p_level

)

CPPUNIT_TEST_SUITE()

MeshFunctionTest::CPPUNIT_TEST_SUITE

(

MeshFunctionTest

)

Tests for general MeshFunction capability.

CPPUNIT_TEST_SUITE_END()

MeshFunctionTest::CPPUNIT_TEST_SUITE_END

(

)

setUp()

void MeshFunctionTest::setUp ( )

inline

Definition at line 46 of file mesh_function.C.

{}

tearDown()

void MeshFunctionTest::tearDown ( )

inline

Definition at line 48 of file mesh_function.C.

{}

test_p_level()

void MeshFunctionTest::test_p_level ( )

inline

Definition at line 53 of file mesh_function.C.

  {
    ReplicatedMesh mesh(*TestCommWorld);
 
    MeshTools::Generation::build_cube (mesh,
                                       5, 5, 5,
                                       0., 1.,
                                       0., 1.,
                                       0., 1.,
                                       HEX20);
 
    // Bump the p-level for all elements. We will create a system with
    // a FIRST, LAGRANGE variable and then use the additional p-level
    // to solve with quadratic elements. Note: set_p_level(1) actually
    // _increases_ the existing variable order by 1, it does not set
    // it to 1.
    for (auto & elem : mesh.active_element_ptr_range())
      elem->set_p_level(1);
 
    EquationSystems es(mesh);
    System & sys = es.add_system<System> ("SimpleSystem");
    unsigned int u_var = sys.add_variable("u", FIRST, LAGRANGE);
 
    es.init();
    sys.project_solution(projection_function, nullptr, es.parameters);
 
 
    std::unique_ptr<NumericVector<Number>> mesh_function_vector
      = NumericVector<Number>::build(sys.comm());
    mesh_function_vector->init(sys.n_dofs(), sys.n_local_dofs(),
                               sys.get_dof_map().get_send_list(), false,
                               GHOSTED);
 
    sys.solution->localize(*mesh_function_vector,
                           sys.get_dof_map().get_send_list());
 
    // So the MeshFunction knows which variables to compute values for.
    std::vector<unsigned int> variables(1);
    variables[0] = u_var;
 
    auto mesh_function =
      libmesh_make_unique<MeshFunction>(sys.get_equation_systems(),
                                        *mesh_function_vector,
                                        sys.get_dof_map(),
                                        variables);
 
    mesh_function->init();
    mesh_function->set_point_locator_tolerance(0.0001);
    DenseVector<Number> vec_values;
    std::string dummy;
 
    // Make sure the MeshFunction's values interpolate the projected solution
    // at the nodes
    for (const auto & node : mesh.local_node_ptr_range())
      {
        (*mesh_function)(*node, /*time=*/ 0., vec_values);
        Number mesh_function_value =
          projection_function(*node,
                              es.parameters,
                              dummy,
                              dummy);
 
        LIBMESH_ASSERT_FP_EQUAL
          (libmesh_real(vec_values(0)),
           libmesh_real(mesh_function_value),
           TOLERANCE*TOLERANCE);
      }
  }

References libMesh::MeshBase::active_element_ptr_range(), libMesh::EquationSystems::add_system(), libMesh::System::add_variable(), libMesh::NumericVector< T >::build(), libMesh::MeshTools::Generation::build_cube(), libMesh::ParallelObject::comm(), libMesh::FIRST, libMesh::System::get_dof_map(), libMesh::System::get_equation_systems(), libMesh::DofMap::get_send_list(), libMesh::GHOSTED, libMesh::HEX20, libMesh::EquationSystems::init(), libMesh::LAGRANGE, libMesh::libmesh_real(), libMesh::MeshBase::local_node_ptr_range(), mesh, libMesh::System::n_dofs(), libMesh::System::n_local_dofs(), libMesh::EquationSystems::parameters, libMesh::System::project_solution(), projection_function(), libMesh::System::solution, TestCommWorld, and libMesh::TOLERANCE.

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The documentation for this class was generated from the following file:

• tests/mesh/mesh_function.C