CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Wiki > RNG-LES model

RNG-LES model

From CFD-Wiki

(Difference between revisions)
Jump to: navigation, search

Revision as of 08:19, 13 September 2005

Based on Renormalization Group Theory. Here  
\mu _{eff}  = \mu \left[ {1 + H\left( x \right)} \right]^{1/3}
.
Where  H\left( x \right) is given by:


H\left( x \right)  
 \begin{matrix}
= x
 \begin{matrix}
 {} & ; & {x > 0}  \\ 
 \end{matrix} 
\\
= 0
 \begin{matrix}
  {} & ; & {x \le 0}  \\ 
 \end{matrix} 

 \end{matrix}


x is given by 
x = {{\mu _s \mu _{eff} } \over {\mu ^3 }} - C

Where  {C = 100} and \mu _s is given by:

 
\mu _s  = \rho \left[ {C_{rng}} Vol^{1/3} \right]^{2} \begin{vmatrix} S \end{vmatrix}
My wiki