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

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

Dear Zhenrong,


I use one of the following to make the conversions:


Re_tau = .166 Re_b^0.88


Re_tau = 0.173 Re_b^0.875


per the attached.  I apologize that I don't have the references for these formulas -- probably in Schlicting but I cannot recall at the moment.


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 6:41:07 AM
To: nek5000-users at lists.mcs.anl.gov
Subject: [Nek5000-users] Reynolds number setting in the turbChannel example


Hello Neks


I am a new user of Nek5000 and my long term objective is to develop and implement some LES models in NEK5000. Now I am working with the turbChannel example.


I want to make sure that the original parameter setting in the example is corresponding to Re_tau = 590 ? When the Reynolds number (p02) is set to 10935, my results show that the Re_tau is lower than 590.


The second question is that, if I want to simulate Re_tau = 180 case, what the Reynolds number (p02) should be? My understanding is that since the U_bar in the turbChannel is equal to 1, the the Reynolds number (p02) should be 2800, which is the Re base on bulk mean velocity in J Kim, P Moin and R Moser 1986 JFM paper.


Any responds is greatly appreciated.


Regards


Zhenrong JING


PhD école centrale de Nantes

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