int main(int argc, char* argv[])
{
// Load the mesh.
Mesh mesh;
H2DReader mloader;
mloader.load("channel.mesh", &mesh);
// Perform initial mesh refinements.
for (int i = 0; i < INIT_REF_NUM; i++) mesh.refine_all_elements(2);
//mesh.refine_towards_boundary(BDY_SOLID_WALL_BOTTOM, 2);
// Initialize boundary condition types and spaces with default shapesets.
L2Space space_rho(&mesh, P_INIT);
L2Space space_rho_v_x(&mesh, P_INIT);
L2Space space_rho_v_y(&mesh, P_INIT);
L2Space space_e(&mesh, P_INIT);
int ndof = Space::get_num_dofs(Hermes::vector<Space*>(&space_rho, &space_rho_v_x, &space_rho_v_y, &space_e));
info("ndof: %d", ndof);
// Initialize solutions, set initial conditions.
InitialSolutionEulerDensity prev_rho(&mesh, RHO_EXT);
InitialSolutionEulerDensityVelX prev_rho_v_x(&mesh, RHO_EXT * V1_EXT);
InitialSolutionEulerDensityVelY prev_rho_v_y(&mesh, RHO_EXT * V2_EXT);
InitialSolutionEulerDensityEnergy prev_e(&mesh, QuantityCalculator::calc_energy(RHO_EXT, RHO_EXT * V1_EXT, RHO_EXT * V2_EXT, P_EXT, KAPPA));
// Numerical flux.
StegerWarmingNumericalFlux num_flux(KAPPA);
// Initialize weak formulation.
EulerEquationsWeakFormExplicitMultiComponentSemiImplicit wf(&num_flux, KAPPA, RHO_EXT, V1_EXT, V2_EXT, P_EXT, BDY_SOLID_WALL_BOTTOM, BDY_SOLID_WALL_TOP,
BDY_INLET, BDY_OUTLET, &prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e);
// Initialize the FE problem.
bool is_linear = true;
DiscreteProblem dp(&wf, Hermes::vector<Space*>(&space_rho, &space_rho_v_x, &space_rho_v_y, &space_e), is_linear);
// If the FE problem is in fact a FV problem.
//if(P_INIT == 0) dp.set_fvm();
// Filters for visualization of Mach number, pressure and entropy.
MachNumberFilter Mach_number(Hermes::vector<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e), KAPPA);
PressureFilter pressure(Hermes::vector<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e), KAPPA);
EntropyFilter entropy(Hermes::vector<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e), KAPPA, RHO_EXT, P_EXT);
ScalarView pressure_view("Pressure", new WinGeom(0, 0, 600, 300));
ScalarView Mach_number_view("Mach number", new WinGeom(700, 0, 600, 300));
ScalarView entropy_production_view("Entropy estimate", new WinGeom(0, 400, 600, 300));
ScalarView s1("1", new WinGeom(0, 0, 600, 300));
ScalarView s2("2", new WinGeom(700, 0, 600, 300));
ScalarView s3("3", new WinGeom(0, 400, 600, 300));
ScalarView s4("4", new WinGeom(700, 400, 600, 300));
// Set up the solver, matrix, and rhs according to the solver selection.
SparseMatrix* matrix = create_matrix(matrix_solver);
Vector* rhs = create_vector(matrix_solver);
Solver* solver = create_linear_solver(matrix_solver, matrix, rhs);
// Set up CFL calculation class.
CFLCalculation CFL(CFL_NUMBER, KAPPA);
int iteration = 0;
double t = 0;
for(t = 0.0; t < 3.0; t += time_step) {
info("---- Time step %d, time %3.5f.", iteration++, t);
// Set the current time step.
wf.set_time_step(time_step);
bool rhs_only = (iteration == 1 ? false : true);
// Assemble stiffness matrix and rhs or just rhs.
if (rhs_only == false) {
info("Assembling the stiffness matrix and right-hand side vector.");
dp.assemble(matrix, rhs);
}
else {
info("Assembling the right-hand side vector (only).");
dp.assemble(NULL, rhs);
}
// Solve the matrix problem.
info("Solving the matrix problem.");
scalar* solution_vector = NULL;
if(solver->solve()) {
solution_vector = solver->get_solution();
Solution::vector_to_solutions(solution_vector, Hermes::vector<Space *>(&space_rho, &space_rho_v_x,
&space_rho_v_y, &space_e), Hermes::vector<Solution *>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
}
else
error ("Matrix solver failed.\n");
if(SHOCK_CAPTURING) {
DiscontinuityDetector discontinuity_detector(Hermes::vector<Space *>(&space_rho, &space_rho_v_x,
&space_rho_v_y, &space_e), Hermes::vector<Solution *>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
std::set<int> discontinuous_elements = discontinuity_detector.get_discontinuous_element_ids(DISCONTINUITY_DETECTOR_PARAM);
FluxLimiter flux_limiter(solution_vector, Hermes::vector<Space *>(&space_rho, &space_rho_v_x,
&space_rho_v_y, &space_e), Hermes::vector<Solution *>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
flux_limiter.limit_according_to_detector(discontinuous_elements);
}
if((iteration - 1) % CFL_CALC_FREQ == 0)
CFL.calculate(Hermes::vector<Solution *>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e), &mesh, time_step);
// Visualization.
/*
Mach_number.reinit();
pressure.reinit();
entropy.reinit();
pressure_view.show(&pressure);
entropy_production_view.show(&entropy);
Mach_number_view.show(&Mach_number);
*/
s1.show(&prev_rho);
s2.show(&prev_rho_v_x);
s3.show(&prev_rho_v_y);
s4.show(&prev_e);
View::wait();
}
pressure_view.close();
entropy_production_view.close();
Mach_number_view.close();
s1.close();
s2.close();
s3.close();
s4.close();
return 0;
}
int main(int argc, char* argv[])
{
// Load the mesh.
Mesh mesh;
H2DReader mloader;
mloader.load("GAMM-channel.mesh", &mesh);
// Perform initial mesh refinements.
for (int i = 0; i < INIT_REF_NUM; i++) mesh.refine_all_elements();
mesh.refine_towards_boundary(1, 1);
mesh.refine_element(1053);
mesh.refine_element(1054);
mesh.refine_element(1087);
mesh.refine_element(1088);
mesh.refine_element(1117);
mesh.refine_element(1118);
mesh.refine_element(1151);
mesh.refine_element(1152);
// Enter boundary markers.
BCTypes bc_types;
bc_types.add_bc_neumann(Hermes::Tuple<int>(BDY_SOLID_WALL, BDY_INLET_OUTLET));
// Create L2 spaces with default shapesets.
L2Space space_rho(&mesh, &bc_types, P_INIT);
L2Space space_rho_v_x(&mesh, &bc_types, P_INIT);
L2Space space_rho_v_y(&mesh, &bc_types, P_INIT);
L2Space space_e(&mesh, &bc_types, P_INIT);
// Initialize solutions, set initial conditions.
Solution sln_rho, sln_rho_v_x, sln_rho_v_y, sln_e, prev_rho, prev_rho_v_x, prev_rho_v_y, prev_e;
sln_rho.set_exact(&mesh, ic_density);
sln_rho_v_x.set_exact(&mesh, ic_density_vel_x);
sln_rho_v_y.set_exact(&mesh, ic_density_vel_y);
sln_e.set_exact(&mesh, ic_energy);
prev_rho.set_exact(&mesh, ic_density);
prev_rho_v_x.set_exact(&mesh, ic_density_vel_x);
prev_rho_v_y.set_exact(&mesh, ic_density_vel_y);
prev_e.set_exact(&mesh, ic_energy);
// Initialize weak formulation.
WeakForm wf(4);
// Bilinear forms coming from time discretization by explicit Euler's method.
wf.add_matrix_form(0, 0, callback(bilinear_form_0_0_time));
wf.add_matrix_form(1, 1, callback(bilinear_form_1_1_time));
wf.add_matrix_form(2, 2, callback(bilinear_form_2_2_time));
wf.add_matrix_form(3, 3, callback(bilinear_form_3_3_time));
// Volumetric linear forms.
// Linear forms coming from the linearization by taking the Eulerian fluxes' Jacobian matrices
// from the previous time step.
// First flux.
// Unnecessary for FVM.
if(P_INIT.order_h > 0 || P_INIT.order_v > 0) {
wf.add_vector_form(0, callback(linear_form_0_1), HERMES_ANY, Hermes::Tuple<MeshFunction*>(&prev_rho_v_x));
wf.add_vector_form(1, callback(linear_form_1_0_first_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y));
wf.add_vector_form(1, callback(linear_form_1_1_first_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y));
wf.add_vector_form(1, callback(linear_form_1_2_first_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y));
wf.add_vector_form(1, callback(linear_form_1_3_first_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form(2, callback(linear_form_2_0_first_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y));
wf.add_vector_form(2, callback(linear_form_2_1_first_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y));
wf.add_vector_form(2, callback(linear_form_2_2_first_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y));
wf.add_vector_form(2, callback(linear_form_2_3_first_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form(3, callback(linear_form_3_0_first_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form(3, callback(linear_form_3_1_first_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form(3, callback(linear_form_3_2_first_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form(3, callback(linear_form_3_3_first_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
// Second flux.
wf.add_vector_form(0, callback(linear_form_0_2), HERMES_ANY, Hermes::Tuple<MeshFunction*>(&prev_rho_v_y));
wf.add_vector_form(1, callback(linear_form_1_0_second_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y));
wf.add_vector_form(1, callback(linear_form_1_1_second_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y));
wf.add_vector_form(1, callback(linear_form_1_2_second_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y));
wf.add_vector_form(1, callback(linear_form_1_3_second_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form(2, callback(linear_form_2_0_second_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y));
wf.add_vector_form(2, callback(linear_form_2_1_second_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y));
wf.add_vector_form(2, callback(linear_form_2_2_second_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y));
wf.add_vector_form(2, callback(linear_form_2_3_second_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form(3, callback(linear_form_3_0_second_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form(3, callback(linear_form_3_1_second_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form(3, callback(linear_form_3_2_second_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form(3, callback(linear_form_3_3_second_flux), HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
}
// Volumetric linear forms coming from the time discretization.
#ifdef HERMES_USE_VECTOR_VALUED_FORMS
wf.add_vector_form(0, linear_form_vector, linear_form_order, HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form(1, linear_form_vector, linear_form_order, HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form(2, linear_form_vector, linear_form_order, HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form(3, linear_form_vector, linear_form_order, HERMES_ANY,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
#else
wf.add_vector_form(0, linear_form, linear_form_order, HERMES_ANY, &prev_rho);
wf.add_vector_form(1, linear_form, linear_form_order, HERMES_ANY, &prev_rho_v_x);
wf.add_vector_form(2, linear_form, linear_form_order, HERMES_ANY, &prev_rho_v_y);
wf.add_vector_form(3, linear_form, linear_form_order, HERMES_ANY, &prev_e);
#endif
// Surface linear forms - inner edges coming from the DG formulation.
#ifdef HERMES_USE_VECTOR_VALUED_FORMS
wf.add_vector_form_surf(0, linear_form_interface_vector, linear_form_order, H2D_DG_INNER_EDGE,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form_surf(1, linear_form_interface_vector, linear_form_order, H2D_DG_INNER_EDGE,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form_surf(2, linear_form_interface_vector, linear_form_order, H2D_DG_INNER_EDGE,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form_surf(3, linear_form_interface_vector, linear_form_order, H2D_DG_INNER_EDGE,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
#else
wf.add_vector_form_surf(0, linear_form_interface_0, linear_form_order, H2D_DG_INNER_EDGE,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form_surf(1, linear_form_interface_1, linear_form_order, H2D_DG_INNER_EDGE,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form_surf(2, linear_form_interface_2, linear_form_order, H2D_DG_INNER_EDGE,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form_surf(3, linear_form_interface_3, linear_form_order, H2D_DG_INNER_EDGE,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
#endif
// Surface linear forms - inlet / outlet edges.
#ifdef HERMES_USE_VECTOR_VALUED_FORMS
wf.add_vector_form_surf(0, bdy_flux_inlet_outlet_comp_vector, linear_form_order, BDY_INLET_OUTLET,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form_surf(1, bdy_flux_inlet_outlet_comp_vector, linear_form_order, BDY_INLET_OUTLET,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form_surf(2, bdy_flux_inlet_outlet_comp_vector, linear_form_order, BDY_INLET_OUTLET,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form_surf(3, bdy_flux_inlet_outlet_comp_vector, linear_form_order, BDY_INLET_OUTLET,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
#else
wf.add_vector_form_surf(0, bdy_flux_inlet_outlet_comp_0, linear_form_order, BDY_INLET_OUTLET,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form_surf(1, bdy_flux_inlet_outlet_comp_1, linear_form_order, BDY_INLET_OUTLET,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form_surf(2, bdy_flux_inlet_outlet_comp_2, linear_form_order, BDY_INLET_OUTLET,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form_surf(3, bdy_flux_inlet_outlet_comp_3, linear_form_order, BDY_INLET_OUTLET,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
#endif
// Surface linear forms - Solid wall edges.
#ifdef HERMES_USE_VECTOR_VALUED_FORMS
wf.add_vector_form_surf(0, bdy_flux_solid_wall_comp_vector, linear_form_order, BDY_SOLID_WALL,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form_surf(1, bdy_flux_solid_wall_comp_vector, linear_form_order, BDY_SOLID_WALL,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form_surf(2, bdy_flux_solid_wall_comp_vector, linear_form_order, BDY_SOLID_WALL,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form_surf(3, bdy_flux_solid_wall_comp_vector, linear_form_order, BDY_SOLID_WALL,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
#else
wf.add_vector_form_surf(0, bdy_flux_solid_wall_comp_0, linear_form_order, BDY_SOLID_WALL,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form_surf(1, bdy_flux_solid_wall_comp_1, linear_form_order, BDY_SOLID_WALL,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form_surf(2, bdy_flux_solid_wall_comp_2, linear_form_order, BDY_SOLID_WALL,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
wf.add_vector_form_surf(3, bdy_flux_solid_wall_comp_3, linear_form_order, BDY_SOLID_WALL,
Hermes::Tuple<MeshFunction*>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e));
#endif
// Initialize the FE problem.
bool is_linear = true;
DiscreteProblem dp(&wf, Hermes::Tuple<Space*>(&space_rho, &space_rho_v_x, &space_rho_v_y, &space_e), is_linear);
// If the FE problem is in fact a FV problem.
if(P_INIT.order_h == 0 && P_INIT.order_v == 0)
dp.set_fvm();
#ifdef HERMES_USE_VECTOR_VALUED_FORMS
dp.use_vector_valued_forms();
#endif
// Filters for visualization of pressure and the two components of velocity.
SimpleFilter pressure(calc_pressure_func, Hermes::Tuple<MeshFunction*>(&sln_rho, &sln_rho_v_x, &sln_rho_v_y, &sln_e));
SimpleFilter u(calc_u_func, Hermes::Tuple<MeshFunction*>(&sln_rho, &sln_rho_v_x, &sln_rho_v_y, &sln_e));
SimpleFilter w(calc_w_func, Hermes::Tuple<MeshFunction*>(&sln_rho, &sln_rho_v_x, &sln_rho_v_y, &sln_e));
SimpleFilter Mach_number(calc_Mach_func, Hermes::Tuple<MeshFunction*>(&sln_rho, &sln_rho_v_x, &sln_rho_v_y, &sln_e));
SimpleFilter entropy_estimate(calc_entropy_estimate_func, Hermes::Tuple<MeshFunction*>(&sln_rho, &sln_rho_v_x, &sln_rho_v_y, &sln_e));
ScalarView pressure_view("Pressure", new WinGeom(0, 0, 600, 300));
ScalarView Mach_number_view("Mach number", new WinGeom(700, 0, 600, 300));
ScalarView entropy_production_view("Entropy estimate", new WinGeom(0, 400, 600, 300));
VectorView vview("Velocity", new WinGeom(700, 400, 600, 300));
// Iteration number.
int iteration = 0;
// Set up the solver, matrix, and rhs according to the solver selection.
SparseMatrix* matrix = create_matrix(matrix_solver);
Vector* rhs = create_vector(matrix_solver);
Solver* solver = create_linear_solver(matrix_solver, matrix, rhs);
// Output of the approximate time derivative.
std::ofstream time_der_out("time_der");
for(t = 0.0; t < 10; t += TAU)
{
info("---- Time step %d, time %3.5f.", iteration, t);
iteration++;
bool rhs_only = (iteration == 1 ? false : true);
// Assemble stiffness matrix and rhs or just rhs.
if (rhs_only == false) info("Assembling the stiffness matrix and right-hand side vector.");
else info("Assembling the right-hand side vector (only).");
dp.assemble(matrix, rhs, rhs_only);
// Solve the matrix problem.
info("Solving the matrix problem.");
if(solver->solve())
Solution::vector_to_solutions(solver->get_solution(), Hermes::Tuple<Space *>(&space_rho, &space_rho_v_x,
&space_rho_v_y, &space_e), Hermes::Tuple<Solution *>(&sln_rho, &sln_rho_v_x, &sln_rho_v_y, &sln_e));
else
error ("Matrix solver failed.\n");
// Approximate the time derivative of the solution.
if(CALC_TIME_DER) {
Adapt *adapt_for_time_der_calc = new Adapt(Hermes::Tuple<Space *>(&space_rho, &space_rho_v_x, &space_rho_v_y, &space_e));
bool solutions_for_adapt = false;
double difference = iteration == 1 ? 0 :
adapt_for_time_der_calc->calc_err_est(Hermes::Tuple<Solution *>(&prev_rho, &prev_rho_v_x, &prev_rho_v_y, &prev_e),
Hermes::Tuple<Solution *>(&sln_rho, &sln_rho_v_x, &sln_rho_v_y, &sln_e),
(Hermes::Tuple<double>*) NULL, solutions_for_adapt,
HERMES_TOTAL_ERROR_ABS | HERMES_ELEMENT_ERROR_ABS) / TAU;
delete adapt_for_time_der_calc;
// Info about the approximate time derivative.
if(iteration > 1)
{
info("Approximate the norm time derivative : %g.", difference);
time_der_out << iteration << '\t' << difference << std::endl;
}
}
// Determine the time step according to the CFL condition.
// Only mean values on an element of each solution component are taken into account.
double *solution_vector = solver->get_solution();
double min_condition = 0;
Element *e;
for (int _id = 0, _max = mesh.get_max_element_id(); _id < _max; _id++) \
if (((e) = mesh.get_element_fast(_id))->used) \
if ((e)->active)
{
AsmList al;
space_rho.get_element_assembly_list(e, &al);
double rho = solution_vector[al.dof[0]];
space_rho_v_x.get_element_assembly_list(e, &al);
double v1 = solution_vector[al.dof[0]] / rho;
space_rho_v_y.get_element_assembly_list(e, &al);
double v2 = solution_vector[al.dof[0]] / rho;
space_e.get_element_assembly_list(e, &al);
double energy = solution_vector[al.dof[0]];
double condition = e->get_area() / (std::sqrt(v1*v1 + v2*v2) + calc_sound_speed(rho, rho*v1, rho*v2, energy));
if(condition < min_condition || min_condition == 0.)
min_condition = condition;
}
if(TAU > min_condition)
TAU = min_condition;
if(TAU < min_condition * 0.9)
TAU = min_condition;
// Copy the solutions into the previous time level ones.
prev_rho.copy(&sln_rho);
prev_rho_v_x.copy(&sln_rho_v_x);
prev_rho_v_y.copy(&sln_rho_v_y);
prev_e.copy(&sln_e);
// Visualization.
pressure.reinit();
u.reinit();
w.reinit();
Mach_number.reinit();
entropy_estimate.reinit();
pressure_view.show(&pressure);
entropy_production_view.show(&entropy_estimate);
Mach_number_view.show(&Mach_number);
vview.show(&u, &w);
// If used, we need to clean the vector valued form caches.
#ifdef HERMES_USE_VECTOR_VALUED_FORMS
DiscreteProblem::empty_form_caches();
#endif
}
time_der_out.close();
return 0;
}