[Nek5000-users] gmers solver issue

[nek5000-users at lists.mcs.anl.gov]

Can you please provide a link to your logfile. This makes it easier for us to understand what's going wrong.

-----Original message-----
> From:nek5000-users at lists.mcs.anl.gov <nek5000-users at lists.mcs.anl.gov>
> Sent: Wednesday 16th May 2018 15:36
> To: nek5000-users at lists.mcs.anl.gov
> Subject: [Nek5000-users] gmers solver issue
> 
> Hello,
> I trying to run the DNS of a pipe-like configuration with NEK-5000  but Im facing some issues that I cannot fully understand.
> More specifically, I am using the PN-PN formulation and the simulation slows down drastically after certain time. I have observed that when
> this  happens the number of GMRES iteration for the pressure solver increases (from 50 at the beginning of the simulation to 170)
> and the norm of the divergence of the velocity increases and I get a WARNING DIV(V)-QTL to large (~ 1.2E-1).
> The problem appeared initially using a 3rd order polynomial, but even using higher order (9
> th) does not solve the issue.
> Do you have some hints about the nature of this issue?
> Kind regards,
> Dante 
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