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Negative Drag on Airfoil

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Old   October 1, 2013, 06:23
Default Negative Drag on Airfoil
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Jason
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I am getting relatively accurate Lift measurements but my drag values are all negative for my airfoil.

I have tried a number of turbulence models and all give the negative drag. I have obtained some form of mesh independence by using the Adapt Gradient tools.

I think I might have a problem with my reference values? Does anyone know how I could change my coordinate system?
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airfoil, ansys, lift, negative drag

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