Hi,
I would like to use the k-w SST model for car aerodynamics. I am a little bit confused because I have found a lot of formulas. k = (3/2)*(U*I)^2 omega = k^(1/2)/(Cmu^(1/4)*l) where U = freestream velocity (40 m/s) I = turbulence intensity (5%) Cmu = 0.09 (constant) l = turbulence length scale (= 0.07*L) L = car length (1.044 m for ahmed body) Are you agree with these formulas and values of k and omega ? k = 6 omega = 63.89 Regards, Stephane. |
My knowledge is based on these guidelines. I'm in doubt with your definition of turbulence length scale: I don't believe L should be the length car. Anyway, if I'm right, one of the advantages of SST turbulent model is the small influence of freestream values, becouse in that region the equations are applied. The solutions should be not so sensitive to the inlet value. However, your values seem not so absurd.
I'm not an expert, you can go on to explore internet and cfd-online forum. Maybe in the meantime others will give you some hints (they all seem to be on holidays now). |
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