>
> The minimal code.
>
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#include
#include
#include
#include
namespace LA
{
#if defined(DEAL_II_WITH_TRILINOS)
using namespace dealii::LinearAlgebraTrilinos;
#else
# error DEAL_II_WITH_TRILINOS required
#endif
}
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
namespace Step55
{
using namespace dealii;
template
class StokesProblem
{
public:
StokesProblem (unsigned int degree);
void run ();
private:
void make_grid ();
void setup_system ();
unsigned int degree;
MPI_Comm mpi_communicator;
FESystem fe;
parallel::distributed::Triangulation triangulation;
DoFHandler dof_handler;
std::vector owned_partitioning;
std::vector relevant_partitioning;
ConstraintMatrix constraints;
};
template
StokesProblem::StokesProblem (unsigned int degree)
:
degree (degree),
mpi_communicator (MPI_COMM_WORLD),
fe (FE_RaviartThomas(degree), 1,
FE_DGQ(degree), 1),
triangulation (mpi_communicator,
typename Triangulation::MeshSmoothing
(Triangulation::smoothing_on_refinement |
Triangulation::smoothing_on_coarsening)),
dof_handler (triangulation)
{}
template
void StokesProblem::make_grid()
{
GridGenerator::hyper_cube (triangulation, 0, 1.0);
triangulation.refine_global (3);
}
template
void StokesProblem::setup_system ()
{
dof_handler.distribute_dofs (fe);
DoFRenumbering::component_wise(dof_handler);
std::vector dofs_per_component(dim + 1);
DoFTools::count_dofs_per_component(dof_handler, dofs_per_component);
const unsigned int n_u = dofs_per_component[0],
n_p = dofs_per_component[dim];
std::cout << "Number of active cells: " << triangulation.n_active_cells()
<< std::endl
<< "Total number of cells: " << triangulation.n_cells()
<< std::endl
<< "Number of degrees of freedom: " << dof_handler.n_dofs()
<< " (" << n_u << '+' << n_p << ')' << std::endl;
owned_partitioning.resize(2);
owned_partitioning[0] = dof_handler.locally_owned_dofs ().get_view(0, n_u);
owned_partitioning[1] = dof_handler.locally_owned_dofs ().get_view(n_u, n_u+n_p);
IndexSet locally_relevant_dofs;
DoFTools::extract_locally_relevant_dofs (dof_handler,
locally_relevant_dofs);
relevant_partitioning.resize(2);
relevant_partitioning[0] = locally_relevant_dofs.get_view(0, n_u);
relevant_partitioning[1] = locally_relevant_dofs.get_view(n_u, n_u+n_p);
constraints.reinit (locally_relevant_dofs);
DoFTools::make_hanging_node_constraints (dof_handler, constraints);
VectorTools::project_boundary_values_div_conforming(dof_handler,
0,
ZeroFunction(dim),
0,
constraints);
constraints.close ();
}
template
void StokesProblem::run ()
{
make_grid ();
setup_system ();
}
}
int main(int argc, char *argv[])
{
using namespace dealii;
using namespace Step55;
Utilities::MPI::MPI_InitFinalize mpi_initialization(argc, argv, 1);
StokesProblem<2> problem (0);
problem.run ();
return 0;
}
##
# CMake script for the step-21 tutorial program:
##
# Set the name of the project and target:
SET(TARGET "test")
# Declare all source files the target consists of. Here, this is only
# the one step-X.cc file, but as you expand your project you may wish
# to add other source files as well. If your project becomes much larger,
# you may want to either replace the following statement by something like
# FILE(GLOB_RECURSE TARGET_SRC "source/*.cc")
# FILE(GLOB_RECURSE TARGET_INC "include/*.h")
# SET(TARGET_SRC ${TARGET_SRC} ${TARGET_INC})
# or switch
