Reference documentation for deal.II version Git 002bd21 2018-05-27 19:22:54 +0200
MGConstrainedDoFs Class Reference

#include <deal.II/multigrid/mg_constrained_dofs.h>

Inheritance diagram for MGConstrainedDoFs:
[legend]

## Public Member Functions

template<int dim, int spacedim>
void initialize (const DoFHandler< dim, spacedim > &dof)

template<int dim, int spacedim>
void initialize (const DoFHandler< dim, spacedim > &dof, const typename FunctionMap< dim >::type &function_map, const ComponentMask &component_mask=ComponentMask())

template<int dim, int spacedim>

void clear ()

bool is_boundary_index (const unsigned int level, const types::global_dof_index index) const

bool at_refinement_edge (const unsigned int level, const types::global_dof_index index) const

bool is_interface_matrix_entry (const unsigned int level, const types::global_dof_index i, const types::global_dof_index j) const

const IndexSetget_boundary_indices (const unsigned int level) const

const IndexSetget_refinement_edge_indices (unsigned int level) const

bool have_boundary_indices () const

const ConstraintMatrixget_level_constraint_matrix (const unsigned int level) const

Public Member Functions inherited from Subscriptor
Subscriptor ()

Subscriptor (const Subscriptor &)

Subscriptor (Subscriptor &&) noexcept

virtual ~Subscriptor ()

Subscriptoroperator= (const Subscriptor &)

Subscriptoroperator= (Subscriptor &&) noexcept

void subscribe (const char *identifier=nullptr) const

void unsubscribe (const char *identifier=nullptr) const

unsigned int n_subscriptions () const

void list_subscribers () const

template<class Archive >
void serialize (Archive &ar, const unsigned int version)

## Private Attributes

std::vector< IndexSetboundary_indices

std::vector< IndexSetrefinement_edge_indices

std::vector< ConstraintMatrixlevel_constraints

Static Public Member Functions inherited from Subscriptor
static::ExceptionBase & ExcInUse (int arg1, std::string arg2, std::string arg3)

static::ExceptionBase & ExcNoSubscriber (std::string arg1, std::string arg2)

## Detailed Description

Collection of boundary constraints and refinement edge constraints for level vectors.

Definition at line 42 of file mg_constrained_dofs.h.

## Member Function Documentation

template<int dim, int spacedim>
 void MGConstrainedDoFs::initialize ( const DoFHandler< dim, spacedim > & dof )
inline

Fill the internal data structures with hanging node constraints extracted from the dof handler object. Works with natural boundary conditions only. There exists a sister function setting up boundary constraints as well.

This function ensures that on every level, degrees of freedom at interior edges of a refinement level are treated corrected but leaves degrees of freedom at the boundary of the domain untouched assuming that no Dirichlet boundary conditions for them exist.

Furthermore, this call sets up a ConstraintMatrix on each level that contains possible periodicity constraints in case those have been added to the underlying triangulation. The constraint matrix can be queried by get_level_constraint_matrix(level). Note that the current implementation of periodicity constraints in this class does not support rotation matrices in the periodicity definition, i.e., the respective argument in the GridTools::collect_periodic_faces() may not be different from the identity matrix.

Definition at line 188 of file mg_constrained_dofs.h.

template<int dim, int spacedim>
 void MGConstrainedDoFs::initialize ( const DoFHandler< dim, spacedim > & dof, const typename FunctionMap< dim >::type & function_map, const ComponentMask & component_mask = ComponentMask() )
inline

Fill the internal data structures with values extracted from the dof handler object and apply the boundary values provided.

This function internally calls the initialize() function above and the constrains degrees on the external boundary of the domain by calling MGTools::make_boundary_list() with the given second and third argument.

Deprecated:
Use initialize() followed by make_zero_boundary_constraints() instead

Definition at line 271 of file mg_constrained_dofs.h.

template<int dim, int spacedim>
 void MGConstrainedDoFs::make_zero_boundary_constraints ( const DoFHandler< dim, spacedim > & dof, const std::set< types::boundary_id > & boundary_ids, const ComponentMask & component_mask = ComponentMask() )
inline

Fill the internal data structures with information about Dirichlet boundary dofs.

The initialize() function has to be called before to set hanging node constraints.

This function can be called multiple times to allow considering different sets of boundary_ids for different components.

Definition at line 291 of file mg_constrained_dofs.h.

 void MGConstrainedDoFs::clear ( )
inline

Reset the data structures.

Definition at line 309 of file mg_constrained_dofs.h.

 bool MGConstrainedDoFs::is_boundary_index ( const unsigned int level, const types::global_dof_index index ) const
inline

Determine whether a dof index is subject to a boundary constraint.

Definition at line 317 of file mg_constrained_dofs.h.

 bool MGConstrainedDoFs::at_refinement_edge ( const unsigned int level, const types::global_dof_index index ) const
inline

Determine whether a dof index is at the refinement edge.

Definition at line 328 of file mg_constrained_dofs.h.

 bool MGConstrainedDoFs::is_interface_matrix_entry ( const unsigned int level, const types::global_dof_index i, const types::global_dof_index j ) const
inline

Determine whether the (i,j) entry of the interface matrix on a given level should be set. This is taken in terms of dof i, that is, return true if i is at a refinement edge, j is not, and both are not on the external boundary.

Definition at line 337 of file mg_constrained_dofs.h.

 const IndexSet & MGConstrainedDoFs::get_boundary_indices ( const unsigned int level ) const
inline

Return the indices of level dofs on the given level that are subject to Dirichlet boundary conditions (as set by the function_map parameter in initialize()). The indices are restricted to the set of locally relevant level dofs.

Definition at line 354 of file mg_constrained_dofs.h.

 const IndexSet & MGConstrainedDoFs::get_refinement_edge_indices ( unsigned int level ) const
inline

Return the indices of dofs on the given level that lie on an refinement edge (dofs on faces to neighbors that are coarser).

Definition at line 363 of file mg_constrained_dofs.h.

 bool MGConstrainedDoFs::have_boundary_indices ( ) const
inline

Return if Dirichlet boundary indices are set in initialize().

Definition at line 372 of file mg_constrained_dofs.h.

 const ConstraintMatrix & MGConstrainedDoFs::get_level_constraint_matrix ( const unsigned int level ) const
inline

Return the level constraint matrix for a given level, containing periodicity constraints (if enabled on the triangulation).

Definition at line 380 of file mg_constrained_dofs.h.

## Member Data Documentation

 std::vector MGConstrainedDoFs::boundary_indices
private

The indices of boundary dofs for each level.

Definition at line 170 of file mg_constrained_dofs.h.

 std::vector MGConstrainedDoFs::refinement_edge_indices
private

The degrees of freedom on a given level that live on the refinement edge between the level and cells on a coarser level.

Definition at line 176 of file mg_constrained_dofs.h.

 std::vector MGConstrainedDoFs::level_constraints
private

Constraint matrices containing information regarding potential periodic boundary conditions for each level .

Definition at line 182 of file mg_constrained_dofs.h.

The documentation for this class was generated from the following file: