[Nek5000-users] LES-wall

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

Thanks Tanmoy for your suggestion.

You are right, for a eddy viscosity type of turbulent model, the  
Channel example is a good starting point (though, I think it should  
be considerably modified to be used in a case with a different  
geometry compared to a channel). But I was thinking of using sort of  
wall model when employing the explicit filtering of velocity field as  
a LES model.

Thanks,
Mohsen

On 24-Dec-14, at 11:23 PM, <nek5000-users at lists.mcs.anl.gov> wrote:

> 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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