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-   -   Turbulent Length Scale (http://www.cfd-online.com/Forums/openfoam/94122-turbulent-length-scale.html)

biscarri November 6, 2011 08:28

Turbulent Length Scale
 
I'm running a case with simpleFoam, stationary flow

I'd like to know how to estimate the Turbulent Length Scale, which by default is set to 0.125 (I use Discretizer to setup OpenFoam cases)

I understand this parameter has relation with the Viscous Wall Layer, and may be deduced from the expression NU/U*, being U* the Friction Velocity which is defined as sqrt(shear_stress/rho)

The question is how to estimate near wall shear stress in order to calculate the Turbulent Lenght Scale, or if there is an easier rule to obtain this parameter.

Thanks for the comments,

dhruv November 7, 2011 05:26

turbulent length scale
 
Hi,

Please have a look here

http://www.cfd-online.com/Wiki/Turbulence_length_scale

Regards,
Dhruv.

biscarri November 8, 2011 05:32

thank's a lot, Dhruv


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