[Nek5000-users] LES-wall

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

Hi Mohsen,

For LES with near wall modelling, you have to develop your own script in
.usr file. There are no in-built routines except eddy_visc() in turbChannel
example.  If you use eddy-viscosity type of near wall models in LES, you
can modify the scripts and write your own eddy-viscosity routines in
uservp.

Thanks,
Tanmoy

Best Regards,
Tanmoy

On Thu, Dec 25, 2014 at 12:47 AM, <nek5000-users at lists.mcs.anl.gov> wrote:

> Hello all,
>
> I have a question regarding LES capability of Nek.
> I know that the explicit filtering introduced in Nek can be effective for
> velocity field to provide sort of eddy viscosity modeling. Nevertheless,
> there should be some form of modeling for the near wall regions, since it
> is almost infeasible to have DNS like resolution in such regions for
> problems with relatively high Reynolds number and large scale geometries. I
> have seen SFR assemblies example on the Nek web in which LES used, however,
> I am not sure if that was an LES with near-wall resolution or with
> near-wall modeling.
>
> So I was wondering if anyone has any experience of using Nek LES with near
> wall models, or kind of hybrid RANS-LES approaches.
>
> Thanks,
> Mohsen
>
>
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