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-   -   turbulence modeling error at a stagnation point (http://www.cfd-online.com/Forums/cd-adapco/55545-turbulence-modeling-error-stagnation-point.html)

erdem August 8, 2006 04:28

turbulence modeling error at a stagnation point
 
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

Pauli August 8, 2006 11:33

Re: turbulence modeling error at a stagnation poin
 
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....

erdem August 8, 2006 11:40

Re: turbulence modeling error at a stagnation poin
 
why cheating? you or google? whats makes the difference?

Pauli August 8, 2006 13:09

Re: turbulence modeling error at a stagnation poin
 
You sound like a student looking for an easy answer. If you use google at least you are doing the research.

HomeworkIsMe August 9, 2006 10:44

Re: turbulence modeling error at a stagnation poin
 
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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