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Old   July 24, 2007, 20:41
Default Spalart-Allmaras turbulent model
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Hi All,

I had coded Spalart-Allmaras turbulent model by using finite volume, pseudo time and LUSGS on Unstructred grid. When trying to validate it againest flat plate (Stanford case 1400), I found that the turbulent viscosity always decreasing. Does any one had experince with such problem. your suggestions is more than welcome.
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Old   July 27, 2007, 08:15
Default Re: Spalart-Allmaras turbulent model
Lionel S.
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What is the Reynolds number, or incident velocity ?

I think that S-A turb model is good only for high Reynolds number applications, especially aerodynamics. For general purposes, I would advice using a very standard k-epsilon model.
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Old   July 30, 2007, 00:59
Default Re: Spalart-Allmaras turbulent model
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Thanks alot Lionel for your reply, Re = 4.4e6 velocity = 33 m/s,

About your advice using k-epsilon model, I already coded S_A model and I thank K-epsilon model is much more complicated especially for unstructured grid. Also K-epsilon has its problems. So that, I want to compromise between numerical complexity and numerical efficiecny.
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