[petsc-users] KSP diverging

[Mohamad M. Nasr-Azadani]

Thanks so much Jed for your prompt response. I will start experimenting
with all the suggestions.

Best,
Mohamad


On Thu, Dec 22, 2011 at 5:31 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> On Thu, Dec 22, 2011 at 19:20, Mohamad M. Nasr-Azadani <mmnasr at gmail.com>wrote:
>
>> Any hints on what is happening here or how I could narrow it down?
>
>
> I would start by following the general advice in the FAQ
>
> http://www.mcs.anl.gov/petsc/documentation/faq.html#kspdiverged
>
>
>> I know that we had an early discussion on the convergnce for the
>> incompressible CFD problems and boomerAMG preconditioning,
>
>
> That was about solving the coupled system. That shouldn't be an issue for
> the Poisson problem.
>
>
>> but it seems that for this case, that is the only one that does not blow
>> up for most of the time integration I have.
>
>
> Since this problem only occurs after long time integration, you might
> consider writing out the model state when you see divergence so that you
> can experiment with alternative methods quickly.
>
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