[Nek5000-users] Heat/passive scalar solver - Helmholtz

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

Dear Philipp,

The usual way to cure the problem is to increase the spatial resolution.
This can be done by changing lx1 in the SIZE file (and, typically, reducing dt).

What is your Peclet or Reynolds number?

What is your grid resolution?

What is your grid Peclet number?

Best,

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: Sunday, March 20, 2016 12:33 PM
To: nek5000-users at lists.mcs.anl.gov
Subject: [Nek5000-users] Heat/passive scalar solver - Helmholtz

Hi Neks,

We simulated the turbulent mixing of passive scalars with the Helmholtz solver. Parameter p22 in the .rea file is set to 10E-09. Our scalar fields show numerical errors, e.g. the scalar volumetric means are not constant but oscillate in time.

Is there a way to reduce the numerical errors / increase the accuracy of the Helmholtz solver?

Best, Philipp Weiss
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