Abstract
The effect of a moving ground and rotating wheels on transient aerodynamic loads acting on a hatchback car model in pitching motion were investigated by dynamic wind tunnel tests. The results showed that phase differences of the lift force and the pitching moment became smaller with respect to the pitch angle of the model, and the gain of the lift force became larger with the moving ground and rotating wheels. CFD results revealed that these changes in transient aerodynamic characteristics could be attributed to changes in flow fields under the center floor and the rear wheelhouses.
