# Turbulent Reynolds number

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 February 27, 2003, 04:55 Turbulent Reynolds number #1 Free_and_SIMPLE Guest   Posts: n/a 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

 February 27, 2003, 05:40 Re: Turbulent Reynolds number #2 prasat Guest   Posts: n/a laminar one I think

 February 27, 2003, 05:45 Re: Turbulent Reynolds number #3 gorka Guest   Posts: n/a Hi, 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.

 March 3, 2003, 09:47 Re: Turbulent Reynolds number #4 Bredberg Guest   Posts: n/a Hi, 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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