Hi,

in LES random (uncorrelated) turbulent fluctuations dissipate before the 'turbulence' developes further. So a random inlet is not recommended in LES calculations... but where in the LES equations can I see the dissipation of uncorrelated fluctuations?

Regards! Flo

Hi,

Compute the ratio of the resolved kinetic energy and the SGS dissipation for uncorrelated fluctuations. This is a time scale which will be very short for uncorrelated fluctuations (the GS strain rate is very high) implying that the eddies dissipate quickly.

Hi tom,

thanks for your advice! Do you have any reference, where I can find a bit more about your explanation? I am bit confused... Those high frequencies probably can produce some 'trouble' with the discretization, too!? But this counts probably for every turbulent flow.

Flo