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

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....

why cheating? you or google? whats makes the difference?

You sound like a student looking for an easy answer. If you use google at least you are doing the research.

Durbin, P. A. (1996), "On the k-epsilon Stagnation Point Anomaly"", International Journal of Heat and Fluid Flow, 1996, Vol. 17, pp. 89-90.