[Nek5000-users] Add/subtract 1d-mean profile

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

Hi Aleks,

thank you for posting your routines. They are certainly very useful!
But my point is to find an easy and quick way to check a single velocity
field. That can usually be done by taking the means over the full box and
subtracting them (as described in the first mail) from the instantaneous
field.
I don't wanna do my full postprocessing that way. It's just to have a quick
look on the data (in particular the fluctuations)...
Do you think that is possible?

Thanks!
Jan F.

Am 9. März 2012 15:34 schrieb <nek5000-users at lists.mcs.anl.gov>:

> Hi Jan,
>
> Here are routines that I sometimes use that call avg_all for the list of a
> dump binary files given in a.list
>
> http://www.mcs.anl.gov/~obabko/avg_fld.usr
>
> Use
>
>     call avg_fld_all
>
> in post-processing mode of Nek5000 (nsteps=0 in .rea) with a created
> a.list file of your binary .f files (for .fld files uncomment line with p66
> & p67 = 4)
>
> Best.
> Aleks
>
>
>
> ----- Original Message -----
> From: nek5000-users at lists.mcs.anl.gov
> To: nek5000-users at lists.mcs.anl.gov
> Sent: Wednesday, March 7, 2012 4:10:44 AM
> Subject: [Nek5000-users] Add/subtract 1d-mean profile
>
>
> Hi NEKs,
>
> I'm new to NEK and as a first exercise I'm calculating DNS of turbulent
> channel flow. So far everything is fine and works as is should.
>
> Now i wanna do some postprocessing with the (binary) files I dumped out.
> Let's say I wanna look at a single file:
>
> Is it possible to calc the 1d mean of u over the whole channel domain (for
> example with "call planar_average_s") then take this 1d mean profile and
> subtract it from u at every point to get u' (=> u'(i,j,k,e) = u(i,j,k,e) -
> <u>(j))?
>
> As I didn't dump the averages with "avg_all()" the hint given in
> https://lists.mcs.anl.gov/mailman/htdig/nek5000-users/2010-May/000451.htmlin this case is not applicable.
>
> Thanks!
> Jan Frielinghausen
>
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