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Turbulence model for Re = 42,000 - 100,000

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Old   March 26, 2013, 19:29
Default Turbulence model for Re = 42,000 - 100,000
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Steve Mcharg
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All,

Reading a paper on the pressure distribution around a cylinder prediction, and interestingly they found that NOT using a turbulent model (k-e) gives better correlation to experiment results then using the k-e model.

I know that the k-e model can be limited for high Reynolds number flows but can anyone expand on this for me please?

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Old   March 27, 2013, 04:46
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Any simple rans modelling (and not only k-e) is not suitable for realistic external low reynolds number flows, especially flows with transition and/or separation. For instance, my experience in computation of flows past airfoils at reynolds numbers 10^4-10^5 tells that using rans for this purpose is a waste of time.
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Old   March 27, 2013, 12:55
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A lot of papers have used k-E turbulence model for these types of simulation, I am only interested in the effects on velocity and pressure distribution. Would it not even allow me to accurately predict these?
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Old   March 27, 2013, 13:05
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well, I can simply suppose that in the boundary layer the pressure distribution is quite similar to that in the external field... therefore, I expect that a no-model simulation (as well as an Euler-based simulation) can provide acceptable pressure distribution. But pressure is not all ...
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