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Old   November 26, 2001, 09:24
Default airfoil reynolds number
Morten Raudszus
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Hi, I'm a student in computational mechanics. We're simulating flow over a 2d-airfoil in High Lift. Is there a possibility to change the Reynolds Number to get the effects on Transitions? There's no direct option for this Fluent 5.5! Some hints would be fine. Morten
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Old   November 28, 2001, 12:49
Default Re: airfoil reynolds number
Chetan Kadakia
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You can include turbulent boundary conditions of higher intensity, and you can even create a wire in the boundary layer that trips the flow to turbulent.

For Reynolds number of transition for a specific (or similar) airfoil, you need to check out some books.

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Old   December 11, 2001, 09:44
Default Re: airfoil reynolds number
jim clancy
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Morten, Re=(density*velocity*length)/viscosity. if we assume the dimensions of your geometry are fixed, then you can increase your Re by increasing the density or velocity or both of then or even by decreasing the viscosity.

Chetan, Intoducing wire on the surface might help in the expeimental cases but not the computational ones.
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Old   December 11, 2001, 14:51
Default Re: airfoil reynolds number
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Ok, I've tried this. This is not a Problem anymore. Now I'm trying to get the maximum lift coeffizient, lift is too high on high angle of attack. I thing we have to vary turbulent kinetic energy and the turbulent dissipation rate, some hints would be fine. thanks
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