Negative Drag in Sweeping motion
Hello All....
i am trying to sweep a wing in STILL AIR, from psi = 0 to pi radian in azimuth direction (i.e about global Y- axis). i have written a udf and used DEFINe CG motion macro. the wing is having constant angle of attack of 5 degrees. In SOLVE>>MOnitor >>Force, i have used X=0, Y=1 for lift and X=1 and Y =0 for drag.... i am getting right Cl curve. the Cd curve starts correctly, but then gives negative values as psi keep increasing. Wht can be the reasons of negative drag and correct lift values. |
PLease note that NO turbulance model is used, so Y+ is not an issue. I have tried the cases with smaller time steps, finer grid and bigger domains too..... but no success....
|
All times are GMT -4. The time now is 13:22. |