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-   -   Negative Drag ????? (https://www.cfd-online.com/Forums/fluent/29769-negative-drag.html)

aydin May 16, 2002 11:57
Negative Drag ?????
 
I am running a turbulent incompressible flow on an airfoil. for angle of attack of 10 or more degrees Spalart almaras model gives negative drag. should I modify turbulent parameters? or any idea???

Sergei May 16, 2002 15:39
Re: Negative Drag ?????
 
Are yours force vectors defined right?

aydin May 17, 2002 01:59
Re: Negative Drag ?????
 
yes...

Andrew Parker May 17, 2002 06:13
Re: Negative Drag ?????
 
I have been modelling airfoils for a while for my final year project, it is defiantly your force vectors-sorry.

Andy


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