[Nek5000-users] Rayleigh example - no flow development

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

Hi Simon,

It's usually a good idea to break symmetry in some way in order to get the flow
to start moving.  Usually that's done in useric by calling some type of random
number generator to put small amplitude disturbances into the field.

Paul

________________________________
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: Thursday, May 07, 2015 8:17 PM
To: nek5000-use.
Subject: [Nek5000-users] Rayleigh example - no flow development

Dear all neks,

Recently I have tried to modify the rayleigh example to my case. However, I discovered that no flow field is developed after a long time. All velocities are zero. I guess I miss something important in the example. Anyone knows which part of the code could lead to this?

Also, although I start with T = -z, I got asymmetric initial condition, something not as I specified as viewed in postnek. Did I miss any point in the .rea and .usr? The files are attached here. They are modified rea and usr from rayleigh to my case.

Thank you very much.

Regards,
Simon
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