[Nek5000-users] Reynolds number setting in the turbChannel example

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

Hi 
Can on help me to write a matlab code for mortar legendre spectral finite element method in two domains to solve poisson equation.
I m tired to imposed the non-matching conditions  

Thank you
Radouen 

-----Message d'origine-----
De : Nek5000-users [mailto:nek5000-users-bounces at lists.mcs.anl.gov] De la part de nek5000-users at lists.mcs.anl.gov
Envoyé : vendredi 22 décembre 2017 16:00
À : nek5000-users at lists.mcs.anl.gov
Objet : Re: [Nek5000-users] Reynolds number setting in the turbChannel example

Hi,
the formula mentioned by Paul can be found in Pope's book (Dean's correlation). Indeed, if Re_tau is off by more than a few percent (say
10) then the quality of the LES is probably not good. Typically, I would expect a dynamic Smagorinsky model to lead to an underprediction of the shear.

Philipp

On 2017-12-22 15:19, nek5000-users at lists.mcs.anl.gov wrote:
> 
> Yes -- but presumably if the LES is at all accurate then the mean wall 
> shear should be reasonably close to DNS or it has otherwise missed an 
> important quantity of interest?
> 
> 
> Paul
> 
> 
> ----------------------------------------------------------------------
> --
> *From:* Nek5000-users <nek5000-users-bounces at lists.mcs.anl.gov> on 
> behalf of nek5000-users at lists.mcs.anl.gov 
> <nek5000-users at lists.mcs.anl.gov>
> *Sent:* Friday, December 22, 2017 7:40:46 AM
> *To:* nek5000-users at lists.mcs.anl.gov
> *Subject:* Re: [Nek5000-users] Reynolds number setting in the 
> turbChannel example Re_tau is a simulation result and not known 
> a-priori i.e. the number below holds for a DNS but not for an LES.
> 
> 
> -----Original message-----
>> From:nek5000-users at lists.mcs.anl.gov 
>> <nek5000-users at lists.mcs.anl.gov>
>> Sent: Friday 22nd December 2017 14:33
>> To: nek5000-users at lists.mcs.anl.gov
>> Subject: Re: [Nek5000-users] Reynolds number setting in the 
>> turbChannel example
>> 
>> Hi Zhenrong,
>> 
>> I used 2800 for shear Reynolds number 180 in channel flow and got a good agreement with Kim et al. (1987).
>> 
>> Hope it work to you.
>> 
>> 
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