[Nek5000-users] Time derivative of Scalar field

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

Hey Paul,

Thanks for the reply. Yes, I wan't to know how to go about computing the
time derivative during the run and write that out each time I write my .fld
files. Yes there any subroutine in the .usr file that I can call?

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 12:44 PM, <nek5000-users at lists.mcs.anl.gov> wrote:

>
> 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> 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 [
>> 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 11:10 AM
>> *To:* 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.
>>
>> _______________________________________________
>> Nek5000-users mailing list
>> Nek5000-users at lists.mcs.anl.gov
>> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
>>
>>
>
> _______________________________________________
> Nek5000-users mailing list
> Nek5000-users at lists.mcs.anl.gov
> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/nek5000-users/attachments/20170424/f279acdb/attachment.html>