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October 24, 2008, 07:44 |
Retau Rebulk channelflow
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Hi,
I have a question to the setup of channel flows comparing with DNS data with Re_tau=395. To get the bulk velocity I use: Re_{\tau}=0.073^{0.5} 2^{-5/8} Re_b^{7/8} to get the bulk velocity of: Re_bulk = 6793.5 Does anyone know, why one rather defines Re_tau than Re_bulk? Is it more correct for comparison or more specific? It probably does not matter, if I am using a Re_bulk of 8000, when taking a look at u+ and y+ anyways!? But then one would calculate and plot u+ and y+ according to the calculated u_tau values, which could be different for each model and mesh!? Would be nice, if you have some ideas! Flo |
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