CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   Main CFD Forum (http://www.cfd-online.com/Forums/main/)
-   -   Turbulent Reynolds number (http://www.cfd-online.com/Forums/main/5786-turbulent-reynolds-number.html)

 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

 All times are GMT -4. The time now is 08:35.