[CIG-SHORT] Petsc linear solver not converging

[Brad Aagaard]

Birendra,

Another issue you need to keep in mind is the accuracy of the solution. 
Even if it converges, the regions with very poor aspect ratio may have 
much higher local errors. If the solution is very smooth, the high 
aspect ratios won't introduce much error. However, if the solution is 
not very smooth in the regions with the high aspect ratios, the errors 
could be significant. Once you get things to converge, you will likely 
need to iterate and adjust the mesh to resolve the solution accurately.

Cheers,
Brad

On 2/26/15 7:36 AM, Birendra jha 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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