Study on the Influence of Rolling Wheels on Car External Flow Field and Aerodynamic Noise

In order to illustrate the external flow field and aerodynamic noise of cars with the influence of rolling wheels, the investigation is conducted through numerical simulation in this paper. Wheel rolling is modeled by using a rotating wall. Combined with Realizable k - epsilon and LES, the flow field and aerodynamic noise of the rolling wheels and the stationary wheels are simulated, respectively. Then the related monitoring points are set to provide the basis for further evaluation. The transient calculation is carried out with two typical cases. Furthermore, air fluctuating pressure and sound pressure level spectrum of the monitoring points in wheel cavity is obtained. The results show that rolling wheels have distinctive influence on vortex formation and car aerodynamic characteristics.