Reference documentation for deal.II version 9.3.0
MGConstrainedDoFs Class Reference

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

Inheritance diagram for MGConstrainedDoFs:
[legend]

## Public Types

using size_dof = std::vector< std::set< types::global_dof_index > >::size_type

## Public Member Functions

template<int dim, int spacedim>
void initialize (const DoFHandler< dim, spacedim > &dof, const MGLevelObject< IndexSet > &level_relevant_dofs=MGLevelObject< IndexSet >())

template<int dim, int spacedim>

void add_user_constraints (const unsigned int level, const AffineConstraints< double > &constraints_on_level)

template<int dim, int spacedim>
void make_no_normal_flux_constraints (const DoFHandler< dim, spacedim > &dof, const types::boundary_id bid, const unsigned int first_vector_component)

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 AffineConstraints< double > & get_level_constraints (const unsigned int level) const

const AffineConstraints< double > & get_user_constraint_matrix (const unsigned int level) const

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

Subscriptor functionality

Classes derived from Subscriptor provide a facility to subscribe to this object. This is mostly used by the SmartPointer class.

void subscribe (std::atomic< bool > *const validity, const std::string &identifier="") const

void unsubscribe (std::atomic< bool > *const validity, const std::string &identifier="") const

unsigned int n_subscriptions () const

template<typename StreamType >
void list_subscribers (StreamType &stream) const

void list_subscribers () const

## Static Public Member Functions

static ::ExceptionBaseExcInUse (int arg1, std::string arg2, std::string arg3)

static ::ExceptionBaseExcNoSubscriber (std::string arg1, std::string arg2)

## Private Attributes

std::vector< IndexSetboundary_indices

std::vector< IndexSetrefinement_edge_indices

std::vector< AffineConstraints< double > > level_constraints

std::vector< AffineConstraints< double > > user_constraints

## Detailed Description

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

Definition at line 46 of file mg_constrained_dofs.h.

## ◆ size_dof

 using MGConstrainedDoFs::size_dof = std::vector >::size_type

Definition at line 49 of file mg_constrained_dofs.h.

## ◆ initialize()

template<int dim, int spacedim>
 void MGConstrainedDoFs::initialize ( const DoFHandler< dim, spacedim > & dof, const MGLevelObject< IndexSet > & level_relevant_dofs = MGLevelObject() )
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 an AffineConstraints object on each level that contains possible periodicity constraints in case those have been added to the underlying triangulation. The AffineConstraints object can be queried by get_level_constraints(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. If no level_relevant_dofs are passed as the second argument, the function uses the locally relevant level DoFs, extracted by DoFTools::extract_locally_relevant_level_dofs(). Otherwise, the user-provided IndexSets, which should define a superset of locally relevant DoFs, are used on each level to allow the user to add additional indices to the set of constrained DoFs.

Definition at line 236 of file mg_constrained_dofs.h.

## ◆ make_zero_boundary_constraints()

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 338 of file mg_constrained_dofs.h.

 void MGConstrainedDoFs::add_user_constraints ( const unsigned int level, const AffineConstraints< double > & constraints_on_level )
inline

Add user defined constraints to be used on level level.

The user can call this function multiple times and any new, conflicting constraints will overwrite the previous constraints for that DoF.

Before the transfer, the user defined constraints will be distributed to the source vector, and then any DoF index set using make_zero_boundary_constraints() will be overwritten with value zero.

Note
This is currently only implemented for MGTransferMatrixFree.

Definition at line 413 of file mg_constrained_dofs.h.

## ◆ make_no_normal_flux_constraints()

template<int dim, int spacedim>
 void MGConstrainedDoFs::make_no_normal_flux_constraints ( const DoFHandler< dim, spacedim > & dof, const types::boundary_id bid, const unsigned int first_vector_component )
inline

Fill the internal data structures with information about no normal flux boundary dofs.

This function is limited to meshes whose no normal flux boundaries have faces which are normal to the x-, y-, or z-axis. Also, for a specific boundary id, all faces must be facing in the same direction, i.e., a boundary normal to the x-axis must have a different boundary id than a boundary normal to the y- or z-axis and so on. If the mesh was produced, for example, using the GridGenerator::hyper_cube() function, setting colorize=true during mesh generation and calling make_no_normal_flux_constraints() for each no normal flux boundary is sufficient.

Definition at line 360 of file mg_constrained_dofs.h.

## ◆ clear()

 void MGConstrainedDoFs::clear ( )
inline

Reset the data structures.

Definition at line 432 of file mg_constrained_dofs.h.

## ◆ is_boundary_index()

 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 441 of file mg_constrained_dofs.h.

## ◆ at_refinement_edge()

 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 452 of file mg_constrained_dofs.h.

## ◆ is_interface_matrix_entry()

 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 461 of file mg_constrained_dofs.h.

## ◆ get_boundary_indices()

 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 478 of file mg_constrained_dofs.h.

## ◆ get_refinement_edge_indices()

 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 487 of file mg_constrained_dofs.h.

## ◆ have_boundary_indices()

 bool MGConstrainedDoFs::have_boundary_indices ( ) const
inline

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

Definition at line 496 of file mg_constrained_dofs.h.

## ◆ get_level_constraints()

 const AffineConstraints< double > & MGConstrainedDoFs::get_level_constraints ( const unsigned int level ) const
inline

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

Definition at line 504 of file mg_constrained_dofs.h.

## ◆ get_user_constraint_matrix()

 const AffineConstraints< double > & MGConstrainedDoFs::get_user_constraint_matrix ( const unsigned int level ) const
inline

Return the user defined constraint matrix for a given level. These constraints are set using the function add_user_constraints() and should not contain constraints for DoF indices set in make_zero_boundary_constraints() as they will be overwritten during the transfer.

Definition at line 513 of file mg_constrained_dofs.h.

## ◆ subscribe()

 void Subscriptor::subscribe ( std::atomic< bool > *const validity, const std::string & identifier = "" ) const
inherited

Subscribes a user of the object by storing the pointer validity. The subscriber may be identified by text supplied as identifier.

Definition at line 136 of file subscriptor.cc.

## ◆ unsubscribe()

 void Subscriptor::unsubscribe ( std::atomic< bool > *const validity, const std::string & identifier = "" ) const
inherited

Unsubscribes a user from the object.

Note
The identifier and the validity pointer must be the same as the one supplied to subscribe().

Definition at line 156 of file subscriptor.cc.

## ◆ n_subscriptions()

 unsigned int Subscriptor::n_subscriptions ( ) const
inlineinherited

Return the present number of subscriptions to this object. This allows to use this class for reference counted lifetime determination where the last one to unsubscribe also deletes the object.

Definition at line 301 of file subscriptor.h.

## ◆ list_subscribers() [1/2]

template<typename StreamType >
 void Subscriptor::list_subscribers ( StreamType & stream ) const
inlineinherited

List the subscribers to the input stream.

Definition at line 318 of file subscriptor.h.

## ◆ list_subscribers() [2/2]

 void Subscriptor::list_subscribers ( ) const
inherited

List the subscribers to deallog.

Definition at line 204 of file subscriptor.cc.

## ◆ serialize()

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

Read or write the data of this object to or from a stream for the purpose of serialization using the BOOST serialization library.

This function does not actually serialize any of the member variables of this class. The reason is that what this class stores is only who subscribes to this object, but who does so at the time of storing the contents of this object does not necessarily have anything to do with who subscribes to the object when it is restored. Consequently, we do not want to overwrite the subscribers at the time of restoring, and then there is no reason to write the subscribers out in the first place.

Definition at line 310 of file subscriptor.h.

## ◆ boundary_indices

 std::vector MGConstrainedDoFs::boundary_indices
private

The indices of boundary dofs for each level.

Definition at line 213 of file mg_constrained_dofs.h.

## ◆ refinement_edge_indices

 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 219 of file mg_constrained_dofs.h.

## ◆ level_constraints

 std::vector > MGConstrainedDoFs::level_constraints
private

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

Definition at line 225 of file mg_constrained_dofs.h.

## ◆ user_constraints

 std::vector > MGConstrainedDoFs::user_constraints
private

Constraint matrices defined by user.

Definition at line 230 of file mg_constrained_dofs.h.

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