Negative Fuselage Drag on a Tandem Wing?
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?
Depending on the shape of your fuselage, it's unlikely but it may actually be possible.
|All times are GMT -4. The time now is 09:26.|