[CIG-SHORT] Petsc linear solver not converging

[Aagaard, Brad]

Birendra,
Try a direct solver. You have a very poorly conditioned system, so there
aren't too many solvers/preconditioners that can make up for that.

Brad

On Thu, Feb 26, 2015 at 7:36 AM, Birendra jha <bjha7333 at yahoo.com> wrote:

> Brad,
>
> Maximum aspect ratio is around 50. I know it's too large and I am working
> on a new grid. Is there anything I can do on the solver side?
>
> Thanks
> Birendra
> --------------------------------------------
> On Thu, 2/26/15, Brad Aagaard <baagaard at usgs.gov> wrote:
>
>  Subject: Re: [CIG-SHORT] Petsc linear solver not converging
>  To: cig-short at geodynamics.org
>  Date: Thursday, February 26, 2015, 10:23 AM
>
>  Birendra,
>
>  Have you run the mesh quality
>  checks? What is the maximum aspect ratio?
>
>  Brad
>
>  On
>  2/26/15 7:04 AM, Birendra jha wrote:
>  >
>  Hi
>  >
>  > I am facing
>  linear solver convergence issue while trying to run the
>  attached test case. The only complexity in the problem is
>  its unstructured grid, created to honor surface layers and
>  two faults.
>  >
>  > I will
>  appreciate any help in resolving this issue. I would like to
>  avoid grid refinement.
>  >
>  > Thanks and regards
>  >
>  Birendra
>  >
>  >
>  >
>  >
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