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

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

Hi Paul,

Thanks. I did set up a python script (thanks to Hank) in VisIt to do the
interpolation and o/p as txt file. Does rmsblah.f0000 file have the other
components of Reynolds stress viz. <uv>, <vw>, <wu> ? Yes, we have a routine
for getting the fluctuating components from nek and outside of it as well.

Regards
Shriram


On 31 December 2010 09:27, <nek5000-users at lists.mcs.anl.gov> wrote:

>
> 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
>>
>>
>
> Z_
>
>
> kk
>
> kk
> http://cuireadhchunceoil.ie/index.php?option=com_content&view=article&id=58
>
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