[Nek5000-users] LES Application to Natural Circulation Problem

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

Nek5000 implements two regularization methods (filtering = explicit or hpfRT) which you can apply in a DNS _and_ LES context. In the LES context you can think of it like a SGS model stabilizing the under-resolved computation. There is a turbChannel example you can experiment with. 

Note, we found that classical Smagorinsky cannot challenge the simple use of regularization while filtered/VMS Smagorinsky versions (not avaiable yet) perform similiar.

Cheers,
Stefan

-----Original message-----
> From:nek5000-users at lists.mcs.anl.gov <nek5000-users at lists.mcs.anl.gov>
> Sent: Tuesday 17th July 2018 0:50
> To: nek5000-users at lists.mcs.anl.gov
> Subject: [Nek5000-users] LES Application to Natural Circulation Problem
> 
> Good afternoon Nek5000,
> Where can I find more information or an example on Neks LES model and how to properly make use of its capabilities.  Am I correct in understanding the method used for solving the
>  periodic hill example uses DNS?
> I have modified the periodic hill example to make my natural circulation problem and want to use of the LES dynamic Smagorinsky model to reduce the simulations computational cost. 
>  Specifically my questions are, which parameters are needed and what guidelines are to be used when inputting these parameters? 
> extrapolation = OIFS?
> filtering = none
> filterWeight = ?
> filterCutoffRatio = 0.9 vs 0.65
> ?
> ?
> ?
> Thanks,
> Mario
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