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elkan June 11, 2007 13:37

turbulence model
 
hi

I am making a simulation 3D airfoil with models S-A and K-e, as of them it is better? the results that I obtain are different, being the greater coefficients drag and lift for k-e than it means this.

I hope that they can help me

thanks

amir June 11, 2007 13:43

Re: turbulence model
 
Hi i had a similar problem and i use k-e .my results were better.but i think u should compare it whit exprimental results. Amir

elkan June 11, 2007 15:50

Re: turbulence model
 
but I do not have experimental datas with which to compare, as model is the suitable one?

Dr. Flow Squad June 13, 2007 03:42

Re: turbulence model
 
k-epsilon tends to "stick" more to the surface than K-omega bassed SST. I don't know about SAS model, but I would expect it to be superior of the both.

Ive done some test between k-e and SST on a circular cylinder. Have a look compared to vanDyke's book:

<CENTER> Exp. Re=100,000, Instantaneous plot: http://i.pbase.com/g3/33/263333/3/53...perimental.jpg

k-Epsilon Stationary: http://i.pbase.com/g3/33/263333/3/53...treamlines.jpg

SST Stationary: http://k43.pbase.com/g3/33/263333/3/...treamlines.jpg

</CENTER> - Dr. Flow Squad



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