TimeSolverTestImplementation< TimeSolverType > Class Template Reference

#include <time_solver_test_common.h>

Inheritance diagram for TimeSolverTestImplementation< TimeSolverType >:

Protected Member Functions
virtual void	aux_time_solver_init (TimeSolverType &)
template<typename SystemType >
void	run_test_with_exact_soln (Real deltat, unsigned int n_timesteps)

Detailed Description

template<typename TimeSolverType>
class TimeSolverTestImplementation< TimeSolverType >

Definition at line 17 of file time_solver_test_common.h.

Member Function Documentation

aux_time_solver_init()

template<typename TimeSolverType >

virtual void TimeSolverTestImplementation< TimeSolverType >::aux_time_solver_init ( TimeSolverType &  )

inlineprotectedvirtual

Reimplemented in NewmarkSolverTestBase, ThetaSolverTestBase< TimeSolverType >, and ThetaSolverTestBase< TimeSolverType >.

Definition at line 22 of file time_solver_test_common.h.

{}

Referenced by TimeSolverTestImplementation< TimeSolverType >::run_test_with_exact_soln().

run_test_with_exact_soln()

template<typename TimeSolverType >

template<typename SystemType >

void TimeSolverTestImplementation< TimeSolverType >::run_test_with_exact_soln ( Real  deltat, unsigned int  n_timesteps  )

inlineprotected

Definition at line 28 of file time_solver_test_common.h.

  {
    Mesh mesh(*TestCommWorld);
    MeshTools::Generation::build_point(mesh);
    EquationSystems es(mesh);
    SystemType & system = es.add_system<SystemType>("ScalarSystem");
 
    system.time_solver = std::make_unique<TimeSolverType>(system);
 
    es.init();
 
    DiffSolver & solver = *(system.time_solver->diff_solver().get());
    solver.relative_step_tolerance = std::numeric_limits<Real>::epsilon()*10;
    solver.relative_residual_tolerance = std::numeric_limits<Real>::epsilon()*10;
    solver.absolute_residual_tolerance = std::numeric_limits<Real>::epsilon()*10;
 
    NewtonSolver & newton = cast_ref<NewtonSolver &>(solver);
 
    // LASPACK GMRES + ILU defaults don't like these problems, so
    // we'll use a sophisticated "just divide the scalars" solver instead.
    newton.get_linear_solver().set_solver_type(JACOBI);
    newton.get_linear_solver().set_preconditioner_type(IDENTITY_PRECOND);
 
    system.deltat = deltat;
 
    TimeSolverType * time_solver = cast_ptr<TimeSolverType *>(system.time_solver.get());
    this->aux_time_solver_init(*time_solver);
 
    // We're going to want to check our solution, and when we run
    // "make check" with LIBMESH_RUN='mpirun -np N" for N>1 then we'll
    // need to keep that check in sync with the processors that are just
    // twiddling their thumbs, not owning our mesh point.
    std::vector<dof_id_type> solution_index;
    solution_index.push_back(0);
    const bool has_solution = system.get_dof_map().all_semilocal_indices(solution_index);
 
    for (unsigned int t_step=0; t_step != n_timesteps; ++t_step)
      {
        system.solve();
        system.time_solver->advance_timestep();
 
        Real rel_error = 0;
 
        if (has_solution)
          {
            Number exact_soln = system.u(system.time);
            rel_error =  std::abs((exact_soln - (*system.solution)(0))/exact_soln);
          }
        system.comm().max(rel_error);
 
        // Using relative error for comparison, so "exact" is 0
        LIBMESH_ASSERT_FP_EQUAL( rel_error,
                                 0.0,
                                 std::numeric_limits<Real>::epsilon()*10 );
      }
  }

References libMesh::DiffSolver::absolute_residual_tolerance, libMesh::EquationSystems::add_system(), TimeSolverTestImplementation< TimeSolverType >::aux_time_solver_init(), libMesh::MeshTools::Generation::build_point(), libMesh::NewtonSolver::get_linear_solver(), libMesh::IDENTITY_PRECOND, libMesh::EquationSystems::init(), libMesh::JACOBI, mesh, libMesh::Real, libMesh::DiffSolver::relative_residual_tolerance, libMesh::DiffSolver::relative_step_tolerance, libMesh::LinearSolver< T >::set_preconditioner_type(), libMesh::LinearSolver< T >::set_solver_type(), and TestCommWorld.

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

• tests/solvers/time_solver_test_common.h