Support code for using an AMR-multigrid cycle as a preconditioner for an outer Krylov solver. More...

Classes
struct	FallbackPolicy
	Stateful policy for the `solver` fallback chain. More...

class	KrylovSolver
	Stateful owner of the outer-Krylov solver path. More...

struct	Settings
	Outer-Krylov configuration. Defaults reproduce stand-alone multigrid (solvers == {GMG}). More...

Enumerations
enum class	SolverType { GMG , GMRES , BiCGStab }
	Top-level solve method. More...

Functions
SolverType	toSolverType (const std::string &a_str)
	Map a solver-type string to the corresponding enum.

std::string	solverTypeName (const SolverType a_type)
	Human-readable name for a solver type, for diagnostic output.

Detailed Description

Support code for using an AMR-multigrid cycle as a preconditioner for an outer Krylov solver.

The multigrid cycle itself (smoother, cycle type, bottom solver, BC stencils, ...) is configured by the usual gmg_* options of the host solver. The settings here control the outer Krylov wrapper.

Enumeration Type Documentation

◆ SolverType

enum class EllipticSolverChain::SolverType

strong

Top-level solve method.

Enumerator
GMG	Stand-alone multigrid V-cycling (no outer Krylov).
GMRES	GMRES preconditioned by the multigrid cycle.
BiCGStab	BiCGStab preconditioned by the multigrid cycle.

Function Documentation

◆ solverTypeName()

std::string EllipticSolverChain::solverTypeName ( const SolverType a_type )

inline

Human-readable name for a solver type, for diagnostic output.

Parameters

[in] a_type KrylovSolver type.

Returns: "gmg", "gmres", or "bicgstab".

◆ toSolverType()

SolverType EllipticSolverChain::toSolverType ( const std::string & a_str )

inline

Map a solver-type string to the corresponding enum.

Pure string-to-enum conversion; the host solver is responsible for reading the input database (the Krylov module deliberately does not call ParmParse). Aborts on an unrecognised string.

Parameters

[in] a_str One of 'gmg', 'gmres', or 'bicgstab'.

Returns: The corresponding SolverType.

Classes