Preconditioners
preconditioners
This module contains classes that augment default Firedrake preconditioners.
FreeSurfaceMassInvPC
Bases: MassInvPC
Version of MassInvPC that includes free surface variables.
SPDAssembledPC
Bases: AssembledPC
Version of AssembledPC that sets the SPD flag for the matrix.
For use in the velocity fieldsplit_0 block in combination with gamg. Setting PETSc MatOption MAT_SPD (for Symmetric Positive Definite matrices) at the moment only changes the Krylov method for the eigenvalue estimate in the Chebyshev smoothers to CG.
Users can provide this class as a pc_python_type
entry to a PETSc solver option dictionary.
initialize(pc)
Initialises the preconditioner.
Parameters:
Name  Type  Description  Default 

pc 
PC

PETSc preconditioner. 
required 
Source code in gadopt/gadopt/preconditioners.py
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