int main(int argc, char* argv[])
{
// Load the mesh.
Hermes::Hermes2D::Mesh mesh;
Hermes::Hermes2D::MeshReaderH2DXML mloader;
mloader.load("domain.xml", &mesh);
// Perform initial mesh refinements (optional).
for (int i = 0; i < INIT_REF_NUM; i++)
mesh.refine_all_elements();
// This is here basically to show off that we can save a mesh with refinements and load it back again.
mloader.save("domain2.xml", &mesh);
mloader.load("domain2.xml", &mesh);
// Initialize the weak formulation.
CustomWeakFormPoisson wf(new Hermes::Hermes1DFunction<double>(LAMBDA_AL), "Aluminum",
new Hermes::Hermes1DFunction<double>(LAMBDA_CU), "Copper", new Hermes::Hermes2DFunction<double>(-VOLUME_HEAT_SRC));
// Initialize essential boundary conditions.
Hermes::Hermes2D::DefaultEssentialBCConst<double> bc_essential(Hermes::vector<std::string>("Bottom", "Inner", "Outer", "Left"),
FIXED_BDY_TEMP);
Hermes::Hermes2D::EssentialBCs<double> bcs(&bc_essential);
// Create an H1 space with default shapeset.
Hermes::Hermes2D::H1Space<double> space(&mesh, &bcs, P_INIT);
int ndof = space.get_num_dofs();
info("ndof = %d", ndof);
// Initialize the FE problem.
Hermes::Hermes2D::DiscreteProblem<double> dp(&wf, &space);
// Initial coefficient vector for the Newton's method.
double* coeff_vec = new double[ndof];
memset(coeff_vec, 0, ndof*sizeof(double));
// Perform Newton's iteration and translate the resulting coefficient vector into a Solution.
Hermes::Hermes2D::Solution<double> sln;
Hermes::Hermes2D::NewtonSolver<double> newton(&dp, matrix_solver_type);
try
{
newton.solve_keep_jacobian(coeff_vec, 1e-3, 10);
}
catch(Hermes::Exceptions::Exception e)
{
e.printMsg();
Hermes::Hermes2D::Solution<double>::vector_to_solution(newton.get_sln_vector(), &space, &sln);
// VTK output.
if (VTK_VISUALIZATION)
{
// Output solution in VTK format.
Hermes::Hermes2D::Views::Linearizer lin;
bool mode_3D = true;
lin.save_solution_vtk(&sln, "sln.vtk", "Temperature", mode_3D);
info("Solution in VTK format saved to file %s.", "sln.vtk");
// Output mesh and element orders in VTK format.
Hermes::Hermes2D::Views::Orderizer ord;
ord.save_orders_vtk(&space, "ord.vtk");
info("Element orders in VTK format saved to file %s.", "ord.vtk");
}
// Visualize the solution.
if (HERMES_VISUALIZATION)
{
Hermes::Hermes2D::Views::ScalarView view("Solution", new Hermes::Hermes2D::Views::WinGeom(0, 0, 440, 350));
// Hermes uses adaptive FEM to approximate higher-order FE solutions with linear
// triangles for OpenGL. The second parameter of View::show() sets the error
// tolerance for that. Options are HERMES_EPS_LOW, HERMES_EPS_NORMAL (default),
// HERMES_EPS_HIGH and HERMES_EPS_VERYHIGH. The size of the graphics file grows
// considerably with more accurate representation, so use it wisely.
view.show(&sln, Hermes::Hermes2D::Views::HERMES_EPS_HIGH);
Hermes::Hermes2D::Views::View::wait();
}
// Clean up.
delete [] coeff_vec;
}
Hermes::Hermes2D::Solution<double>::vector_to_solution(newton.get_sln_vector(), &space, &sln);
// VTK output.
if (VTK_VISUALIZATION)
{
// Output solution in VTK format.
Hermes::Hermes2D::Views::Linearizer lin;
bool mode_3D = true;
lin.save_solution_vtk(&sln, "sln.vtk", "Temperature", mode_3D);
info("Solution in VTK format saved to file %s.", "sln.vtk");
// Output mesh and element orders in VTK format.
Hermes::Hermes2D::Views::Orderizer ord;
ord.save_orders_vtk(&space, "ord.vtk");
info("Element orders in VTK format saved to file %s.", "ord.vtk");
}
// Visualize the solution.
if (HERMES_VISUALIZATION)
{
Hermes::Hermes2D::Views::ScalarView view("Solution", new Hermes::Hermes2D::Views::WinGeom(0, 0, 440, 350));
// Hermes uses adaptive FEM to approximate higher-order FE solutions with linear
// triangles for OpenGL. The second parameter of View::show() sets the error
// tolerance for that. Options are HERMES_EPS_LOW, HERMES_EPS_NORMAL (default),
// HERMES_EPS_HIGH and HERMES_EPS_VERYHIGH. The size of the graphics file grows
// considerably with more accurate representation, so use it wisely.
view.show(&sln, Hermes::Hermes2D::Views::HERMES_EPS_HIGH);
Hermes::Hermes2D::Views::View::wait();
}
// Clean up.
delete [] coeff_vec;
return 0;
}
