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-   -   Kolmogorov turbulence time scale (http://www.cfd-online.com/Forums/fluent/48735-kolmogorov-turbulence-time-scale.html)

iko July 10, 2008 14:16

Kolmogorov turbulence time scale
 
I need to figure out the smallest (Kolmogorov) turbulence time scale of my simulation (unsteady, LES, segregated)

Thee Kolmogorov turbulence time scale is defined by ε and ν ;

So I need to find a way to compute the average rate of energy dissipation per unit mass (ε), and kinematic viscosity of the fluid in fluent (ν) ?

Thanks in advance!


umesh javiya July 11, 2008 14:08

Re: Kolmogorov turbulence time scale
 
May be u could use Custom Field Functions (in define menu) and define your variable... and visualise variable with contours.....


Ashwin July 15, 2008 11:04

Re: Kolmogorov turbulence time scale
 
Try writing a UDF for it. Actually its not necessary to reduce to Kolmogorov scales in LES. To work on those small scales you must have Re^(9/4) points in free space. So you must first start with making the mesh very refined. You must have a lot of memory and computing power to work that


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