DUNE PDELab (git)
#include <dune/pdelab/backend/istl/ovlp_amg_dg_backend.hh>
Public Member Functions | |
void | setParameters (const Parameters &amg_parameters_) |
set AMG parameters More... | |
const Parameters & | parameters () const |
Get the parameters describing the behaviuour of AMG. More... | |
void | setReuse (bool reuse_) |
Set whether the AMG should be reused again during call to apply(). | |
bool | getReuse () const |
Return whether the AMG is reused during call to apply() | |
ISTLBackend_OVLP_AMG_4_DG (DGGO &dggo_, const DGCC &dgcc_, CGGFS &cggfs_, const CGCC &cgcc_, unsigned maxiter_=5000, int verbose_=1, bool reuse_=false, bool usesuperlu_=true) | |
ISTLBackend_OVLP_AMG_4_DG (DGGO &dggo_, const DGCC &dgcc_, CGGFS &cggfs_, const CGCC &cgcc_, const ParameterTree ¶ms) | |
void | setDGSmootherRelaxation (double relaxation_) |
set number of presmoothing steps on the DG level | |
void | setNoDGPreSmoothSteps (int n1_) |
set number of presmoothing steps on the DG level | |
void | setNoDGPostSmoothSteps (int n2_) |
set number of postsmoothing steps on the DG level | |
void | apply (M &A, V &z, V &r, typename Dune::template FieldTraits< typename V::ElementType >::real_type reduction) |
solve the given linear system More... | |
template<typename X > | |
X::ElementType | dot (const X &x, const X &y) const |
Dot product of two vectors. It is assumed that the vectors are consistent on the interior+border partition. | |
template<typename X > | |
Dune::template FieldTraits< typenameX::ElementType >::real_type | norm (const X &x) const |
Norm of a right-hand side vector. The vector must be consistent on the interior+border partition. | |
const Dune::PDELab::LinearSolverResult< double > & | result () const |
Return access to result data. | |
Detailed Description
class Dune::PDELab::ISTLBackend_OVLP_AMG_4_DG< DGGO, DGCC, CGGFS, CGCC, TransferLOP, DGPrec, Solver, s >
Overlapping solver backend for using AMG for DG in PDELab
The template parameters are: DGGO GridOperator for DG discretization, allows access to matrix, vector and grid function space DGCC constraints container for DG problem CGGFS grid function space for CG subspace CGCC constraints container for CG problem TransferLOP local operator to assemble prolongation from CGGFS to DGGFS DGPrec preconditioner for DG problem Solver solver to be used on the complete problem int s size of global index to be used in AMG
Note: The subspace matrix is calculated by a triple matrix product with the fine space DG matrix passed into the apply method. This only works if this DG matrix does not contain P0ParallelConstraints. In order to achieve this behaviour you should use this solver backend with a StationaryLinearProblem or Newton solver that was created using a grid operator with empty constranints. See the overlapping test case in
dune-pdelab/dune/pdelab/test-dg-amg.cc
for an example.
Constructor & Destructor Documentation
◆ ISTLBackend_OVLP_AMG_4_DG() [1/2]
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inline |
◆ ISTLBackend_OVLP_AMG_4_DG() [2/2]
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inline |
Member Function Documentation
◆ apply()
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inline |
solve the given linear system
- Parameters
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[in] A the given matrix [out] z the solution vector to be computed [in] r right hand side [in] reduction to be achieved
◆ parameters()
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inline |
Get the parameters describing the behaviuour of AMG.
The returned object can be adjusted to ones needs and then can be reset using setParameters.
- Returns
- The object holding the parameters of AMG.
◆ setParameters()
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inline |
set AMG parameters
- Parameters
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[in] amg_parameters_ a parameter object of Type Dune::Amg::Parameters
The documentation for this class was generated from the following file:
- dune/pdelab/backend/istl/ovlp_amg_dg_backend.hh