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Old   September 25, 2006, 13:26
Default low rey Naca 0012
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Ravi
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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
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Old   September 25, 2006, 16:10
Default Re: low rey Naca 0012
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Pablo
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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.
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Old   September 25, 2006, 17:04
Default Re: low rey Naca 0012
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Ravi
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ya....I used only laminar....the values are way of the exp values
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Old   September 25, 2006, 17:44
Default Re: low rey Naca 0012
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HSeldon
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Hi Ravi, Im 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 Cls, but the Cds are 10 times over the real values. A question, can you email me the paper you have with the values? Im 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!
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Old   September 26, 2006, 12:07
Default Re: low rey Naca 0012
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Pablo
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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.
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Old   September 26, 2006, 15:34
Default Re: low rey Naca 0012
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HSeldon
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Great, thanks for the tip Pablo!
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