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-   -   lift and drag coefficient definition? (http://www.cfd-online.com/Forums/openfoam/82366-lift-drag-coefficient-definition.html)

draufunddran November 24, 2010 11:16

lift and drag coefficient definition?
 
Hallo,

i want to calc the forcecoeffs with the "libforces.so" Library. I also got it to work but now i have a problem how the coefficients are defiened?

i know the definition: c_d = (2 * F_d)/(rho*UČ*Aref)

In aeronautics the Aref is the area of the Wing from above ( projected area), and in automobile problems Aref is the projected area from the front.

And for want do i need a lref?

greetings,
draufunddran

draufunddran November 26, 2010 08:18

solved... :)


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