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Old   February 27, 2003, 04:55
Default Turbulent Reynolds number
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Hey all,

which viscosity do I use if I am calculating the turbulent Reynolds number : Re_t = SQRT(k)*L_x/nu

Is it the laminar one or the effective/turbulent viscosity at that particular point?

Thanks. F&S
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Old   February 27, 2003, 05:40
Default Re: Turbulent Reynolds number
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laminar one I think
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Old   February 27, 2003, 05:45
Default Re: Turbulent Reynolds number
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The viscosity you should use is the laminar one, since the turbulent Reynolds number stands for, precisely, a ratio between turbulent viscosity [C*rho*Velocity(sqrt(k))*L] and laminar viscosity.

Hope this helps.
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Old   March 3, 2003, 09:47
Default Re: Turbulent Reynolds number
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There exists some different definitions of the turbulent Reynolds number. For turbulence models I've come across the following: Re_T=k**2/(\eps\nu)=k/(\omega\nu) and Re_T=\nu_T/\nu the latter states it quite clearly I believe,

Regards Jonas
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