Aerdynamic Noise Simulation of a Car Side Mirror at Hight Speed

Airflow around the car side mirrors is one of the "sensitivity" zones in which the airflow is separated and detached from the flat side of the mirror. The turbulence created by this flow detachment can then affect the airflow to the main body of the car which lies behind the mirror. The turbulent structures of airflow exert directly on the lateral panels that causes the reduction of the car performance due to the increased drag, the source of noise and vibration, and so on. Consequently, the analysis of structure of airflow allows a better understanding of the aerodynamic phenomena that is the origin of noise source and provides design information to improve and optimize the side mirrors. In this paper, the focus lies on the aerodynamic noise simulation by analyzing the turbulent flow structure and predict the external acoustic field using LES turbulent modeling approaches. The numerical results are compared with experiments through which to provide an overview on the “aerodynamic noise” around car side mirror.