[alireza_b]

Hi
I tried to simulation transition flow over NACA 2415 airfoil. In my study, Reynolds Number is 200,000 and I compare my result with Genc's results (they do their work with fluent).

M. Serdar Genç, Ünver Kaynak, Hüseyin Yapici, "Performance of transition model for predicting low Re aerofoil flows without/with single and simultaneous blowing and suction", European Journal of Mechanics B/Fluids 30 (2011) 218–235

I used K-Kl turbulence models. turbulent intensity is 0.1% and turbulent ratio is 1.
I used second order discretization for all terms.
Y+ is less than 1.

unfortunately I couldn't get acceptable results. in that paper, they got cl=1.03 and cd=0.027.
But my result is far from that and my residual is oscillatory.
I tried this work:
1- solved with other turbulence models and then switched to K-Kl model.
2-I decreased under relaxation factors.


Dear friends
How can I get acceptable result.