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Reference documentation for deal.II version 8.1.0
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#include <mg_smoother.h>
Public Member Functions | |
SmootherRelaxation (const unsigned int steps=1, const bool variable=false, const bool symmetric=false, const bool transpose=false) | |
template<class MATRIX2 > | |
void | initialize (const MGLevelObject< MATRIX2 > &matrices, const typename RELAX::AdditionalData &additional_data=typename RELAX::AdditionalData()) |
template<class MATRIX2 , class DATA > | |
void | initialize (const MGLevelObject< MATRIX2 > &matrices, const MGLevelObject< DATA > &additional_data) |
void | clear () |
virtual void | smooth (const unsigned int level, VECTOR &u, const VECTOR &rhs) const |
std::size_t | memory_consumption () const |
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MGLevelObject (const unsigned int minlevel=0, const unsigned int maxlevel=0) | |
RELAX & | operator[] (const unsigned int level) |
const RELAX & | operator[] (const unsigned int level) const |
void | resize (const unsigned int new_minlevel, const unsigned int new_maxlevel) |
MGLevelObject< RELAX > & | operator= (const double d) |
void | clear () |
unsigned int | min_level () const |
unsigned int | max_level () const |
unsigned int | get_minlevel () const DEAL_II_DEPRECATED |
unsigned int | get_maxlevel () const DEAL_II_DEPRECATED |
std::size_t | memory_consumption () const |
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Subscriptor () | |
Subscriptor (const Subscriptor &) | |
virtual | ~Subscriptor () |
Subscriptor & | operator= (const Subscriptor &) |
void | subscribe (const char *identifier=0) const |
void | unsubscribe (const char *identifier=0) const |
unsigned int | n_subscriptions () const |
void | list_subscribers () const |
DeclException3 (ExcInUse, int, char *, std::string &,<< "Object of class "<< arg2<< " is still used by "<< arg1<< " other objects.\n"<< "(Additional information: "<< arg3<< ")\n"<< "Note the entry in the Frequently Asked Questions of "<< "deal.II (linked to from http://www.dealii.org/) for "<< "more information on what this error means.") | |
DeclException2 (ExcNoSubscriber, char *, char *,<< "No subscriber with identifier \""<< arg2<< "\" did subscribe to this object of class "<< arg1) | |
template<class Archive > | |
void | serialize (Archive &ar, const unsigned int version) |
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MGSmoother (const unsigned int steps=1, const bool variable=false, const bool symmetric=false, const bool transpose=false) | |
MGSmoother (VectorMemory< VECTOR > &mem, const unsigned int steps=1, const bool variable=false, const bool symmetric=false, const bool transpose=false) DEAL_II_DEPRECATED | |
void | set_steps (const unsigned int) |
void | set_variable (const bool) |
void | set_symmetric (const bool) |
void | set_transpose (const bool) |
void | set_debug (const unsigned int level) |
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virtual | ~MGSmootherBase () |
Additional Inherited Members | |
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unsigned int | steps |
bool | variable |
bool | symmetric |
bool | transpose |
unsigned int | debug |
SmartPointer< VectorMemory< VECTOR >, MGSmoother< VECTOR > > | mem |
Smoother using relaxation classes.
A relaxation class is an object that has two member functions,
performing one step of the smoothing scheme.
This class performs smoothing on each level. The operation can be controlled by several parameters. First, the relaxation parameter omega
is used in the underlying relaxation method. steps
is the number of relaxation steps on the finest level (on all levels if variable
is off). If variable
is true
, the number of smoothing steps is doubled on each coarser level. This results in a method having the complexity of the W-cycle, but saving grid transfers. This is the method proposed by Bramble at al.
The option symmetric
switches on alternating between the smoother and its transpose in each step as proposed by Bramble.
transpose
uses the transposed smoothing operation using Tstep
instead of the regular step
of the relaxation scheme.
If you are using block matrices, the second initialize
function offers the possibility to extract a single block for smoothing. In this case, the multigrid method must be used only with the vector associated to that single block.
Definition at line 234 of file mg_smoother.h.
mg::SmootherRelaxation< RELAX, VECTOR >::SmootherRelaxation | ( | const unsigned int | steps = 1 , |
const bool | variable = false , |
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const bool | symmetric = false , |
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const bool | transpose = false |
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Constructor. Sets memory and smoothing parameters.
void mg::SmootherRelaxation< RELAX, VECTOR >::initialize | ( | const MGLevelObject< MATRIX2 > & | matrices, |
const typename RELAX::AdditionalData & | additional_data = typename RELAX::AdditionalData() |
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Initialize for matrices. This function initializes the smoothing operator with the same smoother for each level.
additional_data
is an object of type RELAX::AdditionalData
and is handed to the initialization function of the relaxation method.
void mg::SmootherRelaxation< RELAX, VECTOR >::initialize | ( | const MGLevelObject< MATRIX2 > & | matrices, |
const MGLevelObject< DATA > & | additional_data | ||
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Initialize matrices and additional data for each level.
If minimal or maximal level of the two objects differ, the greatest common range is utilized. This way, smoothing can be restricted to certain levels even if the matrix was generated for all levels.
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virtual |
Initialize for matrix blocks. This function initializes the smoothing operator with the same smoother for each level.
additional_data
is an object of type RELAX::AdditionalData
and is handed to the initialization function of the relaxation method. Empty all vectors.
Implements MGSmootherBase< VECTOR >.
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virtual |
The actual smoothing method.
Implements MGSmootherBase< VECTOR >.
std::size_t mg::SmootherRelaxation< RELAX, VECTOR >::memory_consumption | ( | ) | const |
Memory used by this object.