[Nek5000-users] Using Cartesian grid lookup table in Nekton

Wed May 30 13:48:16 CDT 2018

What’s your question? How to do the interpolation in your function f?

On 30 May 2018, at 20:17, "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> > wrote:

Hi,

Thanks for the reply. My problem is f is given as a discrete data set described in finite difference grid. I want to interpolate this to 'ffx' like you said in my .usr file. Would like to know how to proceed.

Thanks,
Saikat

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

On Wed, May 30, 2018 at 1:36 PM, <nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov> > wrote:
Let's consider 

ffx = f(x,y,z)

here f is an user function (something you have to provide) which get evaluated at x,y,z (your grid points). Interpolation is required if f is given by a discrete data set. 

hth

-----Original message-----
> From:nek5000-users at lists.mcs.anl.gov <mailto:From%3Anek5000-users at lists.mcs.anl.gov> <nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov> >
> Sent: Wednesday 30th May 2018 19:19
> To: nek5000-users <nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov> >
> Subject: Re: [Nek5000-users] Using Cartesian grid lookup table in Nekton
> 
> Hi,
> 
> Thanks for the reply. The look up table is in a finite difference grid. Are you saying I can still feed it to the .usr file and it should be fine?
> 
> Thanks,
> Saikat
> <br clear="all" />Saikat Mukherjee,
> PhD Student,
> Paul Research Group - http://www.me.vt.edu/mpaul/ <http://www.me.vt.edu/mpaul/> <http://www.me.vt.edu/mpaul/ <http://www.me.vt.edu/mpaul/> >
> Engineering Science and Mechanics,
> Virginia Tech.
> 
> On Sat, May 26, 2018 at 10:54 PM,  <nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov> <mailto:nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov> >> wrote:
> Hi Saikat,
> 
> You can always do the reading from the look up table from .usr file, at once then feed the data to your ffx ffy and ffz through a common block.
> 
> On Thu, May 24, 2018 at 10:55 PM,  <nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov> <mailto:nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov> >> wrote:
> Hey all,
> 
> Just following up on the query. Would appreciate any input.
> 
> Thanks,
> Saikat
> <br clear="all" />Saikat Mukherjee,
> PhD Student,
> Paul Research Group - http://www.me.vt.edu/mpaul/ <http://www.me.vt.edu/mpaul/> <http://www.me.vt.edu/mpaul/ <http://www.me.vt.edu/mpaul/> >
> Engineering Science and Mechanics,
> Virginia Tech.
> 
> On Tue, May 22, 2018 at 4:47 PM, Saikat Mukherjee <msaikat6 at vt.edu <mailto:msaikat6 at vt.edu> <mailto:msaikat6 at vt.edu <mailto:msaikat6 at vt.edu> >> wrote:
> Hey Neks,
> 
> I have a forcing function which is in the form of a look up table in X-Y cartesian grid. I would like to use this forcing function in the 2-D fluid momentum equation that Nekton solves. Is there a way to do this in the .usr file or elsewhere?
> 
> Thanks,
> Saikat
> 
> 
> <br clear="all" />Saikat Mukherjee,
> PhD Student,
> Paul Research Group - http://www.me.vt.edu/mpaul/ <http://www.me.vt.edu/mpaul/> <http://www.me.vt.edu/mpaul/ <http://www.me.vt.edu/mpaul/> >
> Engineering Science and Mechanics,
> Virginia Tech.
> 
> 
> _______________________________________________
> Nek5000-users mailing list
> Nek5000-users at lists.mcs.anl.gov <mailto:Nek5000-users at lists.mcs.anl.gov> <mailto:Nek5000-users at lists.mcs.anl.gov <mailto:Nek5000-users at lists.mcs.anl.gov> >
> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users <https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users>
> 
> 
> 
> _______________________________________________
> Nek5000-users mailing list
> Nek5000-users at lists.mcs.anl.gov <mailto:Nek5000-users at lists.mcs.anl.gov> <mailto:Nek5000-users at lists.mcs.anl.gov <mailto:Nek5000-users at lists.mcs.anl.gov> >
> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users <https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users>
> 
> 
> _______________________________________________
> Nek5000-users mailing list
> Nek5000-users at lists.mcs.anl.gov <mailto: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 <mailto: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 <mailto: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/20180530/c4dad18f/attachment-0001.html>