about Subgridscale model
Hi, foamers.
Is there anyone who can recommend me a SGS model for the airfoil case? (of course LES, Reynolds number is less than 100,000) Based on some literature reviews, some works are done with 'Dynamic smagorinsky' model and some works are done with 'Mixedsclae model' ( Sagaut, P. 1996 : Numerical simulations of separated flows with subgrid models) or 'Mixedtime model' (Inagaki et al. 2005 : A Mixedtimescale SGS model with fixed model  parameters for practical LES). I've checked 'dynamic Smagorinsky model' in openfoam but one line (below) is ambiguous in the dynSmagorinsky.C file. 00060 dimensionedScalar MMMM = average(magSqr(MM)); here I don't understand what 'average' means. Does it mean averaging in whole domain? if it means averaging whole domain, this model doesn't seem so attractive since original model averaged only in homogeneous directions. So I tried to look for 'Mixedscale model' or 'Mixedtime model' in openfoam but these two models are not implemented yet. I am also wondering is there anyone who implemented these two models into openfoam. To sum, which sgs model do you recommend for the airfoil case ? what is the 'average' mean in the 'dynamic Smagorinsky model' ? Is there anyone who implement 'Mixed scale model' or 'Mixedtime model' into the openfoam ? Thanks in advance Yusik 
Quote:
Similarly, the mixedtime model simply redefines the SGS viscosity as a function of a certain timescale, with some theoretical advantage. You could implement it by starting from an existing model (like the dynamic one) in OF. Best, 
wrong questions sorry

Quote:
Could you suggest a related tutorial case? I am tring to using the dynamic Smagorinsky model, but without success. My best regards, Jian 
Quote:
Could you suggest a related tutorial case? I am tring to using the dynamic Smagorinsky model, but without success. My best regards, Jian 
All times are GMT 4. The time now is 15:48. 