Inheritance diagram for NewmarkSolverTestBase:

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Public Member Functions
	NewmarkSolverTestBase ()

Protected Member Functions
virtual void	aux_time_solver_init (NewmarkSolver &time_solver) override

void	set_beta (Real beta)

void	run_test_with_exact_soln (Real deltat, unsigned int n_timesteps)

Protected Attributes
Real	_beta

Detailed Description

Definition at line 62 of file second_order_unsteady_solver_test.C.

Constructor & Destructor Documentation

◆ NewmarkSolverTestBase()

NewmarkSolverTestBase::NewmarkSolverTestBase ( )

inline

Definition at line 65 of file second_order_unsteady_solver_test.C.

    : TimeSolverTestImplementation<NewmarkSolver>(),
    _beta(0.25)
  {}

Member Function Documentation

◆ aux_time_solver_init()

virtual void NewmarkSolverTestBase::aux_time_solver_init ( NewmarkSolver & time_solver )

inlineoverrideprotectedvirtual

Reimplemented from TimeSolverTestImplementation< NewmarkSolver >.

Definition at line 72 of file second_order_unsteady_solver_test.C.

73 { time_solver.set_beta(_beta);

74 time_solver.compute_initial_accel(); }

References _beta.

◆ run_test_with_exact_soln()

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

inlineprotectedinherited

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 );
      }
  }