[Nek5000-users] Restarting with PNPN using PNPN-2 results

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

Hi Phil,

The regularity of the pressure field is much larger for Pn-Pn as compared to Pn-Pn-2 so it should take some time to readjust to the larger resolution.

Aleks
________________________________
From: nek5000-users-bounces at lists.mcs.anl.gov [nek5000-users-bounces at lists.mcs.anl.gov] on behalf of nek5000-users at lists.mcs.anl.gov [nek5000-users at lists.mcs.anl.gov]
Sent: Monday, June 13, 2016 2:09 PM
To: nek5000-users at lists.mcs.anl.gov
Subject: [Nek5000-users] Restarting with PNPN using PNPN-2 results

Hello neks,

I have a DNS simulation that I was running as PNPN-2 and I would like to run it as PNPN without starting back at the initial conditions.
I am curious if anyone has experience running a PNPN case with initial conditions from a PNPN-2 simulation?  I have tried this and the simulation runs okay, except the pressure term never seems to converge when running the PNPN simulation.  This dramatically increases runtime and makes the results questionable.  It seems to me that restarting with PNPN-2 results should be doable, and that it should only take a few iterations for the pressure term to start converging.  However, my simulation is still not converging after 100+ iterations, but it was converging fine when I was running PNPN-2.

Any suggestions for things I should look for that might cause the problem, or potential fixes?

Thanks
--
Phil Sakievich

PhD Candidate - Mechanical Engineering
Arizona State University - Ira A. Fulton School for Engineering of Matter Transport and Energy
Tempe, Arizona
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