[Nek5000-users] Post-Processing from avg_all files using Nek / Visit

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

Hi Shriram,

I see that Hank answered some of your questions already.

If we define u = <u> + u' then we have

<u'>^2 = <u^2> - <u>^2

with <u^2> stored in rms and <u> stored in avg.   (Similar
forms exist for the cross terms.)   postx can load the
rms and avg files to give you <u'>^2 -- but not yet with the
.f0000 format.

Another common approach is to manipulate these by loading all 
the avg files inside the solver itself.   We can set up an
example that illustrates this.    At that point, you could
also interpolate the output onto a finer mesh before passing
to visit.

Paul



On Thu, 30 Dec 2010, nek5000-users at lists.mcs.anl.gov wrote:

> Hi,
>
> I would like to post-process quantities from avg_all files (rms, rm2, avg).
> Particularly I am looking at line plots (mainly) or contours on a plane. I
> had a question regarding the approach that I might be taking..
>
> If I load the files, say rmsblah.f0000* into nek using the load subroutine
> and fill the ux,uy,uz arrays with that of <u^2>, <v^2>, <w^2> and call
> hpts(), how would the interpolation work ? Would it interpolate <u^2> with
> the interpolation that is used for velocities ?. The other option would be
> to do a line plot from Visit and export it to a text file. Also, I am not
> sure how Visit interpolates. Which is more likely to be accurate ?
>
> Regards
> Shriram
>


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