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Forum: Main CFD Forum

March 24, 2009, 11:36

Replies: 16

petsc and diverge

Views: 5,512

Posted By jed

To repeat, your lack of convergence is not a...

To repeat, your lack of convergence is not a failing of GMRES or any other Krylov iteration, it's use of an inappropriate preconditioner. There are no good black-box preconditioners for indefinite...

Forum: Main CFD Forum

March 24, 2009, 06:41

Replies: 16

petsc and diverge

Views: 5,512

Posted By jed

PETSc mailing list

Also, the PETSc mailing list http://lists.mcs.anl.gov/pipermail/petsc-users/ is a very good place to ask questions like this. Provide as much detail as possible and exact error messages.

Forum: Main CFD Forum

March 24, 2009, 06:38

Replies: 16

petsc and diverge

Views: 5,512

Posted By jed

Preconditioners for indefinite problems

It seems like you are confusing the preconditioner with the Krylov method. As the first step, you should find a preconditioner that works with GMRES and -ksp_gmres_restart 300 (or some other large...

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