[Nek5000-users] Channel Flow 1D/2D energy spectra

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

Hi,
For most cases, we typically do all these things (statistics, spectra, 
budgets) outside of Nek5000, on simpler meshes (equidistant or polar 
meshes for instance). For instance in our paper on pipe flow, we show 
exactly those 1D and 2D energy spectra.

https://link.springer.com/article/10.1007/s10494-013-9482-8

For your purpose however, I would suggest some physical space filter 
with specific transfer function. That might be the easiest way.

Best regards,
Philipp

On 2018-08-19 07:54, nek5000-users at lists.mcs.anl.gov wrote:
> Hi Nek Users,
> 
> I am a new user to Nek5000 and I have been playing around with the 
> channel flow example. I have set up an example similar to Kim and Moin. 
> The mean velocity profile seems to agree quite well so I have set up the 
> initial case correctly.  Now, my goal is to try and recreate the energy 
> spectra as in the paper above. I am confused as to the best way to go 
> about this, would it be best to obtain output files then do the post 
> processing outside of Nek or can it be done inside Nek as well?
> 
> My ultimate goal is to be able to cut off some of the higher energy 
> modes and transform it back and feed it at the start of the simulation. 
> Any advice on this would be appreciated as I have been struggling as to 
> how I should proceed in Nek5000.
> 
> Thanks in advance,
> David
> 
> 
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