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LevelSolver Class Reference

Solves elliptic equations on a level. More...

#include <LevelSolver.H>

Collaboration diagram for LevelSolver:

[legend]List of all members.

Public Methods
	LevelSolver ()
	Null constructor, leaves LevelSolver undefined.
virtual	~LevelSolver ()
	Destructor.
	LevelSolver (const DisjointBoxLayout &a_grids, const DisjointBoxLayout *a_baseGrids, const ProblemDomain &a_domain, Real a_dxLevel, int a_nRefCrse, const LevelOp *const a_opin, int a_ncomp, bool a_limitCoarsening=false)
	Full constructor. Calls full define function.
	LevelSolver (const DisjointBoxLayout &a_grids, const DisjointBoxLayout *a_baseGrids, const Box &a_domain, Real a_dxLevel, int a_nRefCrse, const LevelOp *const a_opin, int a_ncomp=1, bool a_limitCoarsening=false)
	Full constructor (Deprecated -- use ProblemDomain instead).
virtual void	define (const DisjointBoxLayout &a_grids, const DisjointBoxLayout *a_baseGrids, const ProblemDomain &a_domain, Real a_dxLevel, int a_nRefCrse, const LevelOp *const a_opin, int a_ncomp=1, bool a_limitCoarsening=false)
	Full define function.
virtual void	define (const DisjointBoxLayout &a_grids, const DisjointBoxLayout *a_baseGrids, const Box &a_domain, Real a_dxLevel, int a_nRefCrse, const LevelOp *const a_opin, int a_ncomp=1, bool a_limitCoarsening=false)
	Full define function. (Deprecated -- use ProblemDomain version instead).
bool	isDefined () const
	Has this object been defined already?
void	clearMemory ()
	Clears storage.
void	setDefaultValues ()
	Internal use function to set default values for solver parameters.
void	levelSolveH (LevelData< FArrayBox > &a_phi, const LevelData< FArrayBox > &a_rhs, bool a_initializePhiToZero=true)
	Do a level solve with homogeneous BCs on this level using multigrid.
void	levelSolve (LevelData< FArrayBox > &a_phi, const LevelData< FArrayBox > *a_phic, const LevelData< FArrayBox > &a_rhs, bool a_initializePhiToZero=true)
	Do a level solve with inhomogeneous BCs on this level using multigrid.
void	setNumSmoothUp (int a_numSmoothUp)
	Set number of multigrid smoothings on way up v-cycle. Default is 4.
void	setNumSmoothDown (int a_numSmoothDown)
	Set number of multigrid smoothings on way down v-cycle; Default is 4.
void	setTolerance (Real a_tolerance)
	Set solution tolerance.
void	setOperatorTolerance (Real a_operatorTolerance)
	Set "operator tolerance" of iterative solution.
void	setVerbose (bool a_verbose)
	Set how much info is printed out during solve.
void	setMaxIter (int a_maxIter)
	Set max number multigrid vcycles to use in solution.
void	setMinIter (int a_minIter)
	Set min number of iterations.
virtual void	setConvergenceMetric (Real a_metric, int a_comp)
	set the convergence metrics (if appropriate) for this problem
virtual void	resetConvergenceMetrics ()
	rest the convergence metrics to an undefined state (for solver re-use)
void	setNormType (int a_normType)
	set type of norm to use to judge convergence
Protected Attributes
LevelMG	m_levelMG
LevelOp *	m_levelOpPtr
bool	m_isDefined
DisjointBoxLayout	m_grids
ProblemDomain	m_domain
LevelData< FArrayBox >	m_resid
LevelData< FArrayBox >	m_scratch
LevelData< FArrayBox >	m_corr
int	m_nRefCrse
Real	m_dxLevel
int	m_maxIter
int	m_minIter
int	m_numSmoothUp
int	m_numSmoothDown
Real	m_tolerance
int	m_normType
Vector< Real >	m_convergenceMetrics
Real	m_operatorTolerance
bool	m_verbose

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Detailed Description

Solves elliptic equations on a level.

LevelSolver Solves elliptic equations on a level using multigrid.

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Constructor & Destructor Documentation

LevelSolver::LevelSolver (    )

Null constructor, leaves LevelSolver undefined.

virtual LevelSolver::~LevelSolver (    )  [virtual]

Destructor.

LevelSolver::LevelSolver (  const DisjointBoxLayout &    a_grids, const DisjointBoxLayout *    a_baseGrids, const ProblemDomain &    a_domain, Real    a_dxLevel, int    a_nRefCrse, const LevelOp *const    a_opin, int    a_ncomp, bool    a_limitCoarsening = false )

Full constructor. Calls full define function. Calls corresponding full define function. Inputs: a_grids: Grid on which solution will be computed. a_baseGrids: pointer to next coarser grids. Should be == NULL if there is no coarser level. a_domain: domain of solution level a_dxLevel: grid spacing at solution level a_nRefCrse: refinement ratio between two levels. Not used if there is no finer level a_opin: operator L used in solution of Lphi = rho a_limitCoarsening: if true, only do multigrid coarsening down to next coarser AMR level (only coarsen by a_nRefCrse). If false, coarsen as far as possible.

LevelSolver::LevelSolver (  const DisjointBoxLayout &    a_grids, const DisjointBoxLayout *    a_baseGrids, const Box &    a_domain, Real    a_dxLevel, int    a_nRefCrse, const LevelOp *const    a_opin, int    a_ncomp = 1, bool    a_limitCoarsening = false )

Full constructor (Deprecated -- use ProblemDomain instead). Calls corresponding full define function. Inputs: a_grids: Grid on which solution will be computed. a_baseGrids: pointer to next coarser grids. Should be == NULL if there is no coarser level. a_domain: domain of solution level a_dxLevel: grid spacing at solution level a_nRefCrse: refinement ratio between two levels. Not used if there is no finer level a_opin: operator L used in solution of Lphi = rho a_limitCoarsening: if true, only do multigrid coarsening down to next coarser AMR level (only coarsen by a_nRefCrse). If false, coarsen as far as possible.

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Member Function Documentation

void LevelSolver::clearMemory (    )

Clears storage.

virtual void LevelSolver::define (  const DisjointBoxLayout &    a_grids, const DisjointBoxLayout *    a_baseGrids, const Box &    a_domain, Real    a_dxLevel, int    a_nRefCrse, const LevelOp *const    a_opin, int    a_ncomp = 1, bool    a_limitCoarsening = false )  [virtual]

Full define function. (Deprecated -- use ProblemDomain version instead). Inputs: a_grids: Grid on which solution will be computed. a_baseGrids: pointer to next coarser grids. Should be == NULL if there is no coarser level. a_domain: domain of solution level a_dxLevel: grid spacing at solution level a_nRefCrse: refinement ratio between two levels. Not used if there is no finer level a_opin: operator L used in solution of Lphi = rho a_limitCoarsening: if true, only do multigrid coarsening down to next coarser AMR level (only coarsen by a_nRefCrse). If false, coarsen as far as possible.

virtual void LevelSolver::define (  const DisjointBoxLayout &    a_grids, const DisjointBoxLayout *    a_baseGrids, const ProblemDomain &    a_domain, Real    a_dxLevel, int    a_nRefCrse, const LevelOp *const    a_opin, int    a_ncomp = 1, bool    a_limitCoarsening = false )  [virtual]

Full define function. Inputs: a_grids: Grid on which solution will be computed. a_baseGrids: pointer to next coarser grids. Should be == NULL if there is no coarser level. a_domain: domain of solution level a_dxLevel: grid spacing at solution level a_nRefCrse: refinement ratio between two levels. Not used if there is no finer level a_opin: operator L used in solution of Lphi = rho a_limitCoarsening: if true, only do multigrid coarsening down to next coarser AMR level (only coarsen by a_nRefCrse). If false, coarsen as far as possible.

bool LevelSolver::isDefined (    )  const

Has this object been defined already?

void LevelSolver::levelSolve (  LevelData< FArrayBox > &    a_phi, const LevelData< FArrayBox > *    a_phic, const LevelData< FArrayBox > &    a_rhs, bool    a_initializePhiToZero = true )

Do a level solve with inhomogeneous BCs on this level using multigrid. Uses inhomogeneous bcs at interfaces. phic should be set to NULL if there is no coarser level. Parameters: a_phi  initial guess at solution, returns solution a_phic  solution at next coarser level a_rhs  right-hand side a_initializePhiToZero  if true, set phi to 0 at start (o/w use initial guess)

void LevelSolver::levelSolveH (  LevelData< FArrayBox > &    a_phi, const LevelData< FArrayBox > &    a_rhs, bool    a_initializePhiToZero = true )

Do a level solve with homogeneous BCs on this level using multigrid. Uses homogeneous bcs at coarse/fine interfaces Parameters: a_phi  initial guess at solution, returns solution a_rhs  right-hand side a_initializePhiToZero  if true, set phi to 0 at start (o/w use initial guess)

virtual void LevelSolver::resetConvergenceMetrics (    )  [virtual]

rest the convergence metrics to an undefined state (for solver re-use)

virtual void LevelSolver::setConvergenceMetric (  Real    a_metric, int    a_comp )  [virtual]

set the convergence metrics (if appropriate) for this problem sets metric against which we define convergence (for example, the norm of the RHS). Also passes a_metric through to the LevelMG (and eventually to a bottom solver.)

void LevelSolver::setDefaultValues (    )

Internal use function to set default values for solver parameters.

void LevelSolver::setMaxIter (  int    a_maxIter )

Set max number multigrid vcycles to use in solution.

void LevelSolver::setMinIter (  int    a_minIter )

Set min number of iterations. Only relevant when residual is not decreasing fast enough to satisfy the "operator tolerance". Default is 4.

void LevelSolver::setNormType (  int    a_normType )

set type of norm to use to judge convergence

void LevelSolver::setNumSmoothDown (  int    a_numSmoothDown )

Set number of multigrid smoothings on way down v-cycle; Default is 4.

void LevelSolver::setNumSmoothUp (  int    a_numSmoothUp )

Set number of multigrid smoothings on way up v-cycle. Default is 4.

void LevelSolver::setOperatorTolerance (  Real    a_operatorTolerance )

Set "operator tolerance" of iterative solution. Iteration will stop if (new_residual/old_residual) > 1-operatorTolerance (and at least minIter iterations have been performed). Default is 1.0e-5.

void LevelSolver::setTolerance (  Real    a_tolerance )

Set solution tolerance.

void LevelSolver::setVerbose (  bool    a_verbose )

Set how much info is printed out during solve.

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Member Data Documentation

Vector<Real> LevelSolver::m_convergenceMetrics [protected]

metrics used to judge convergence

LevelData<FArrayBox> LevelSolver::m_corr [protected]

Correction

ProblemDomain LevelSolver::m_domain [protected]

Problem domain at this level

Real LevelSolver::m_dxLevel [protected]

Cell spacing on this level

DisjointBoxLayout LevelSolver::m_grids [protected]

Grids at this level

bool LevelSolver::m_isDefined [protected]

Has this LevelSolver been defined yet?

LevelMG LevelSolver::m_levelMG [protected]

LevelMG level solver object to relax on this level

LevelOp* LevelSolver::m_levelOpPtr [protected]

LevelMG level solver object to relax on this level

int LevelSolver::m_maxIter [protected]

Maximum number of solver iterations

int LevelSolver::m_minIter [protected]

Minimum number of iterations

int LevelSolver::m_normType [protected]

type of norm to use for evaluating convergence

int LevelSolver::m_nRefCrse [protected]

Refinement ratio to coarser level

int LevelSolver::m_numSmoothDown [protected]

Number of smoother iterations on down cycle

int LevelSolver::m_numSmoothUp [protected]

Number of smoother iterations on up cycle

Real LevelSolver::m_operatorTolerance [protected]

Tolerance used to stop solver iteration if convergence hangs.

LevelData<FArrayBox> LevelSolver::m_resid [protected]

Residual

LevelData<FArrayBox> LevelSolver::m_scratch [protected]

Useful scratch space.

Real LevelSolver::m_tolerance [protected]

Solver tolerance

bool LevelSolver::m_verbose [protected]

How verbose shold the solve be?

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

• LevelSolver.H

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