how good is fluent in predicting the drag and lift at very low reynolds number...for example at re of approximately 5000. When I run the lift is quite good but the drag is very small unlike that shown in an exp paper which I found...has anyone done simulations at this very low re....if so did you get good results

5000? that's laminar flow.

If you wanna get simulate transition process you have to use v2f turbulence model. But, I'm pretty sure Re=5000 it's fully laminar flow.

ya....I used only laminar....the values are way of the exp values

Hi Ravi, I´m dealing with the NACA 0012 too, but with a reynolds of about 360k. Comparing with differents turb models I got relatively goods numbers on the Cl´s, but the Cd´s are 10 times over the real values. A question, can you email me the paper you have with the values? I´m using a soft called Snack to get the numbers for comparing with my CFD results. You can mail me at agriotti@gmail.com How do you set up the references values? I want to compare with mine.

Thanks!

ofcourse you are going to get those Cd values. at Re 360k, depends on the angle of attack, you have transition at 40% chord more or less. And you are modelate it fully turbulent. YOU HAVE TO USE V2F TURBULENCE MODEL, this model is able to modelate the transition process.

Great, thanks for the tip Pablo!