I am currently working on a project with my university collegues. We are building a RC-Car with aerodynamical features. As we were designing heck spoiler we started simulating the wings. First we did it with XFLR5 and then we tried combining some to get a multielement wing. But the lift and Drag coefficients are not nearly as good as the one of the single element wing in XFLR5. Is it possible, that we did someting wrong in the Setup of the Force and Moment Coefficient?? Do we have to set the reference area and legth need to be very precise??
We are complete noobs, and are thankfull for every hint.
It’s very hard to compare between these sorts of cases since multiple factors might drive the difference in the results. For instance:
Indeed, if the reference area is not accurately measured, you’ll not be comparing apples to apples
If the meshes are different, there should be a difference in the results
If the boundary layers are not well behaved, you’ll get fairly different results, especially since the coefficients come from the forces measured at the walls
I’ll recommend that you check out these resources:
Thank you very much.
I have been doing research too, and maybe it is a problem, that the lift and drag direction are set like in the defaults, i have changed them to the right axis, but they are still one meter. How do i set them to the right distance ? More precisce, what are these lenghts?
