[Nek5000-users] Time derivative of Scalar field

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

Can you just save them without writing them out?

I would compute the time derivative during the run and then write that out?


________________________________
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, April 24, 2017 11:24 AM
To: nek5000-users at lists.mcs.anl.gov
Subject: Re: [Nek5000-users] Time derivative of Scalar field

Hey Paul,

In my case, the time step is very small, and I want the scalars (initially a small gaussian blob in the center of the cylindrical domain) to hit the wall. For that to happen I need too many files to print out. Right now I am printing them out at 0.1*(vertical diffusion time) and get say 100 files to hit the wall. While my time step is 1e-4 * (vertical diffusion time) for RB convection.

Thanks,
Saikat

Saikat Mukherjee,
PhD Student,
Paul Research Group - http://www.me.vt.edu/mpaul/
Engineering Science and Mechanics,
Virginia Tech.

On Mon, Apr 24, 2017 at 12:20 PM, <nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov>> wrote:

Hi Saikat,

Any reason to not save a few time steps and apply finite differences?

Paul

________________________________
From: nek5000-users-bounces at lists.mcs.anl.gov<mailto:nek5000-users-bounces at lists.mcs.anl.gov> [nek5000-users-bounces at lists.mcs.anl.gov<mailto:nek5000-users-bounces at lists.mcs.anl.gov>] on behalf of nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov> [nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov>]
Sent: Monday, April 24, 2017 11:10 AM
To: nek5000-users at lists.mcs.anl.gov<mailto:nek5000-users at lists.mcs.anl.gov>
Subject: [Nek5000-users] Time derivative of Scalar field

Hello Neks,

I want to find out the time derivative of Scalar field in my Rayleigh Benard calculations. Can you give me any idea how to go about it? Right now I get the scalar field only along with the primitive variables. But I want to get the time derivative field of the scalars (dc/dt).

Thanks,
Saikat

Saikat Mukherjee,
PhD Student,
Paul Research Group - http://www.me.vt.edu/mpaul/
Engineering Science and Mechanics,
Virginia Tech.

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