CFD Online Logo CFD Online URL
Home > Wiki > Smagorinsky-Lilly model

Smagorinsky-Lilly model

From CFD-Wiki

(Difference between revisions)
Jump to: navigation, search
Line 12: Line 12:
Where the filter length is given by
\bar \Delta  = \nabla ^{\frac{1}{3}}  
\bar \Delta  = \nabla ^{\frac{1}{3}}  

Revision as of 21:52, 13 September 2005

The Smagorinsky model could be summerised as:

\tau _{ij}  - \frac{1}{3}\tau _{kk} \delta _{ij}  =  - 2\left( {C_s \bar \Delta } \right)^2 \left| {\bar S} \right|S_{ij}

In the Smagorinsky-Lilly model, the eddy-viscosity is modeled by

\mu _{sgs}  = \rho \left( {C_s \bar \Delta } \right)^2 \left| {\bar S} \right|

Where the filter length is given by

\bar \Delta  = \nabla ^{\frac{1}{3}}


\bar S = \sqrt {2S_{ij} S_{ij} }

The effective viscosity is calculated from

\mu _{eff}  = \mu _{mol}  + \mu _{sgs}

The Smagorinsky constant usually has the value:

C_s  = 0.1 - 0.2
My wiki