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-   -   Negative Fuselage Drag on a Tandem Wing? (http://www.cfd-online.com/Forums/main/99589-negative-fuselage-drag-tandem-wing.html)

mmn1239 April 6, 2012 21:02

Negative Fuselage Drag on a Tandem Wing?
 
Hey guys,

So, I am modeling external flow over a tandem wing aircraft in Star-ccm+. The domain size looks sufficient, the volume mesh looks good, the solution has converged and has been run for 3500 iterations, and I have double checked the force vector and force monitor orientations.

I have divided the reports into component and total values for lift and drag, and the overall total values for lift and drag look good. The other sub-components lift and drag values (front wing, rear wing, and tail) all look good except the fuse, which has a negative drag value.

When I run the fuse just by itself, it has a positive drag value and reasonable down force. So, my question is: in conjunction with the other aircraft components for a tandem configuration is it possible to have a negative drag value for the fuse component?

Thanks!

Mike

lovecraft22 April 7, 2012 04:52

Depending on the shape of your fuselage, it's unlikely but it may actually be possible.


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