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

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

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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