comparison with DNS
I have been trying to perform CFD analysis of isotropic turbulence using LES like scheme. In order to compare my results with DNS,should I be finding the parameters like intergral length scale(to find turn over time) from my scheme or take the DNS value. Thanks a lot......

Quote:

Hi, thanks a lot for the reply.... when i want to plot the total energy for example, the time axis is generally nondimensionalized which involves a length scale(integral length scale). should i obtain this value from a DNS or calculate from my code?... thnx a lot

in homogeneous isotropic flows the characteristic lenght scale is generally the Taylor microscale lambda, on whcih the Reynolds number of the computation is based too. Use information from DNS as in LES you have a cutoff of the smallest scales (only scales in the inertial range are computed) and you cannot compute the Taylor length.

thanks a lot for clarifying......

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