Dune::ACFem::BlockConstraintsOperatorInterface< DiscreteFunction, Traits > Class Template Reference

Interface class for a block-constraints-operator. More...

#include <dune/acfem/operators/constraints/blockconstraintsoperator.hh>

Public Member Functions
void	rebuild () const
	An update method which has to be called initially or after mesh-adaptation, or for time-dependent constraint values to recompute the affine offset when moving to the next time-step.
void	operator() (const DiscreteFunctionType &arg, DiscreteFunctionType &w) const
	Apply the operator to the given argument. More...
void	constrain (DiscreteFunctionType &w) const
	The solution operator; unconditionally install the given constraints into the argument. More...
void	zeroConstrain (DiscreteFunctionType &w) const
	Unconditionally set the values of all masked DoFs to zero.
size_t	size () const
	Return the number of constrainted block-DoFs.
LocalOperatorType	localOperator (const EntityType &entity) const
	Generate the local version of this operator from the given entitiy.
LocalOperatorType	localOperator () const
	Generate the local version of this operator, must later be bound to an entity by calling its init() method.

Detailed Description

template<class DiscreteFunction, class Traits>
class Dune::ACFem::BlockConstraintsOperatorInterface< DiscreteFunction, Traits >

Interface class for a block-constraints-operator.

A block-constraints-operator is an operator which operates only on a sub-space of a discrete space by flagging a collection of block-DoFs as active. It can be used to implement, e.g., Dirichlet boundary constraints or bulk-constraints for primal/dual active set algorithms. It is meant to be composed with an ordinary operater. A constraints-operator which satisfies the interace defined below also has to provide a local operator version.

Member Function Documentation

constrain()

template<class DiscreteFunction , class Traits >

void Dune::ACFem::BlockConstraintsOperatorInterface< DiscreteFunction, Traits >::constrain ( DiscreteFunctionType &  w ) const

inline

The solution operator; unconditionally install the given constraints into the argument.

This "solves"

\[ w - g = 0 \]

for w.

References Dune::ACFem::asImp().

operator()()

template<class DiscreteFunction , class Traits >

void Dune::ACFem::BlockConstraintsOperatorInterface< DiscreteFunction, Traits >::operator() ( const DiscreteFunctionType &  arg, DiscreteFunctionType &  w  ) const

inline

Apply the operator to the given argument.

This operates as as an affine linear operator which computes

\[ \Gamma(x) = x - g \]

where g defines the affine offet. TZhe operator acts only on the given subset of "active" DoFs (e.g. the boundary DoFs) and leaves all other values of w alone.

References Dune::ACFem::asImp().

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

• dune/acfem/operators/constraints/blockconstraintsoperator.hh