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Free_and_SIMPLE February 27, 2003 04:55

Turbulent Reynolds number
 
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

prasat February 27, 2003 05:40

Re: Turbulent Reynolds number
 
laminar one I think

gorka February 27, 2003 05:45

Re: Turbulent Reynolds number
 
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.

Bredberg March 3, 2003 09:47

Re: Turbulent Reynolds number
 
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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