step-2.cc File Reference

#include <deal.II/dofs/dof_handler.h>
#include <deal.II/dofs/dof_renumbering.h>
#include <deal.II/dofs/dof_tools.h>
#include <deal.II/fe/fe_q.h>
#include <deal.II/grid/grid_generator.h>
#include <deal.II/grid/manifold_lib.h>
#include <deal.II/grid/tria.h>
#include <deal.II/grid/tria_accessor.h>
#include <deal.II/grid/tria_iterator.h>
#include <deal.II/lac/dynamic_sparsity_pattern.h>
#include <deal.II/lac/sparse_matrix.h>
#include <fstream>

Include dependency graph for step-2.cc:

Go to the source code of this file.

Functions
void	make_grid (Triangulation< 2 > &triangulation)
void	distribute_dofs (DoFHandler< 2 > &dof_handler)
void	renumber_dofs (DoFHandler< 2 > &dof_handler)
int	main ()

Function Documentation

make_grid()

void make_grid

(

Triangulation< 2 > &

triangulation

)

Definition at line 41 of file step-2.cc.

{
  const Point<2> center(1, 0);
  const double   inner_radius = 0.5, outer_radius = 1.0;
  GridGenerator::hyper_shell(
    triangulation, center, inner_radius, outer_radius, 5);
 
  static const SphericalManifold<2> manifold_description(center);
  triangulation.set_all_manifold_ids(0);
  triangulation.set_manifold(0, manifold_description);
 
  for (unsigned int step = 0; step < 3; ++step)
    {
      Triangulation<2>::active_cell_iterator cell =
                                               triangulation.begin_active(),
                                             endc = triangulation.end();
 
      for (; cell != endc; ++cell)
        for (unsigned int v = 0; v < GeometryInfo<2>::vertices_per_cell; ++v)
          {
            const double distance_from_center =
              center.distance(cell->vertex(v));
 
            if (std::fabs(distance_from_center - inner_radius) < 1e-10)
              {
                cell->set_refine_flag();
                break;
              }
          }
 
      triangulation.execute_coarsening_and_refinement();
    }
}

distribute_dofs()

void distribute_dofs

(

DoFHandler< 2 > &

dof_handler

)

Definition at line 77 of file step-2.cc.

{
  static const FE_Q<2> finite_element(1);
  dof_handler.distribute_dofs(finite_element);
 
  DynamicSparsityPattern dynamic_sparsity_pattern(dof_handler.n_dofs(),
                                                  dof_handler.n_dofs());
 
  DoFTools::make_sparsity_pattern(dof_handler, dynamic_sparsity_pattern);
 
  SparsityPattern sparsity_pattern;
  sparsity_pattern.copy_from(dynamic_sparsity_pattern);
 
  std::ofstream out("sparsity_pattern1.svg");
  sparsity_pattern.print_svg(out);
}

renumber_dofs()

void renumber_dofs

(

DoFHandler< 2 > &

dof_handler

)

Definition at line 97 of file step-2.cc.

{
  DoFRenumbering::Cuthill_McKee(dof_handler);
 
  DynamicSparsityPattern dynamic_sparsity_pattern(dof_handler.n_dofs(),
                                                  dof_handler.n_dofs());
  DoFTools::make_sparsity_pattern(dof_handler, dynamic_sparsity_pattern);
 
  SparsityPattern sparsity_pattern;
  sparsity_pattern.copy_from(dynamic_sparsity_pattern);
 
  std::ofstream out("sparsity_pattern2.svg");
  sparsity_pattern.print_svg(out);
}

main()

int main

(

)

Definition at line 115 of file step-2.cc.

{
  Triangulation<2> triangulation;
  make_grid(triangulation);
 
  DoFHandler<2> dof_handler(triangulation);
 
  distribute_dofs(dof_handler);
  renumber_dofs(dof_handler);
}