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turbulence modeling error at a stagnation point

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Old   August 8, 2006, 04:28
Default turbulence modeling error at a stagnation point
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erdem
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hi

I'm studying external aerodynamics of Ahmed Body car geometry. I have used realizable k-eps, SST k-omega and RSM models. in terms of drag coefficient I got similar values with all models. but all of them calculated nearly 1.5-2 times drag at the front of the body (comparing with the original experiments. Realizable k-epsilon has the highest drag on the front.

why does this happen? would you please help me about investigating the greater pressures at the front caused by turbulence modeling? I have to write a discussion about it. this is really important. thanks for you time.

Erdem
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Old   August 8, 2006, 11:33
Default Re: turbulence modeling error at a stagnation poin
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Pauli
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If I answered your question & you used my answer, you might get penalized for cheating. So I will do you a favor & refrain from answering. So Google on....
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Old   August 8, 2006, 11:40
Default Re: turbulence modeling error at a stagnation poin
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erdem
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why cheating? you or google? whats makes the difference?
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Old   August 8, 2006, 13:09
Default Re: turbulence modeling error at a stagnation poin
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Pauli
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You sound like a student looking for an easy answer. If you use google at least you are doing the research.
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Old   August 9, 2006, 10:44
Default Re: turbulence modeling error at a stagnation poin
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HomeworkIsMe
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Durbin, P. A. (1996), "On the k-epsilon Stagnation Point Anomaly"", International Journal of Heat and Fluid Flow, 1996, Vol. 17, pp. 89-90.
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