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Kolmogorov turbulence time scale

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Old   July 10, 2008, 13:16
Default Kolmogorov turbulence time scale
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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 (&epsilon, and kinematic viscosity of the fluid in fluent (&nu ?

Thanks in advance!

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Old   July 11, 2008, 13:08
Default Re: Kolmogorov turbulence time scale
umesh javiya
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May be u could use Custom Field Functions (in define menu) and define your variable... and visualise variable with contours.....

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Old   July 15, 2008, 10:04
Default Re: Kolmogorov turbulence time scale
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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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