# A Question on the Dynamic procedure in LES

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 April 19, 2005, 03:55 A Question on the Dynamic procedure in LES #1 dragon Guest   Posts: n/a hi,all! In the dynamic smagrinsky procedure we get Cs=0.5*(Lij*Mij)/(Mij*Mij) ^^^^^^^^(1) the equation is from D.K.Lilly , But I have also seen that the isotropic part of Lij should be removed from (1) so Cs=0.5*(Lij-1/3*DELTAij*Lkk)*Mij/(Mij*Mij)^^^^^^^(2) I can understand (2) but for (1) Lilly explained that the isotropic part of Lij does not appear because in incompressible flow Sii=0, I dont really understand this ,since no direct links between Lij 's isotropic part and Sii exist. can anyone tell me which equation I should use,maybe their effect doesn't differ much,so either will be ok? any comment is welcome,thanks.

 April 28, 2005, 15:11 Re: A Question on the Dynamic procedure in LES #2 noName Guest   Posts: n/a The isotropic part of S is simply added to the pressure gradient term (since it is a normal stress). It is usually not included in the SGS stress formulation. Whenever people refer to S_ij, they usually mean only the anisotropic part of it.

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