Learning Forum

[dkmenend]

Hi I am running a simple case of external flow over a solar car. airspeed 17.88 m/s, moving ground -17.88m/s (in positive z axis) (to simulate road). Reference value for area is 0.6227 which is in the correct axis (z axis) and refernce vel is (17.88m/s) both computed from the car. I am getting a coef of drag of  -0.1105. I am confused as to why I am getting a negative value. Any ideas? 

[Rob]

It's usually linked to the reference values. However, check the force reports (forces and not coefficients) to see what's happening.