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-   -   Negative Drag on Airfoil (http://www.cfd-online.com/Forums/fluent/124276-negative-drag-airfoil.html)

jasonbot October 1, 2013 06:23

Negative Drag on Airfoil
 
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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