Abstract: Aiming at the aeroacoustic problem of the exterior rearview mirror of a car, a fast optimization scheme for aerodynamic noise is proposed based on the calculation of exterior flow field around vehicle, with the results of optimization verified by corresponding tests. In unsteady numerical simulation, the aerodynamic noises on the surface of front side window are analyzed by detached eddy simulation combined with computational aeroacoustics. The results indicate that after optimization, the intensity of aerodynamic noise source on the surface of front side window is obviously weakened in most frequency bands, and the sound pressure level at different monitoring points is lowered, meanwhile the results of real vehicle road test show that the scheme of aeroacoustic optimization based on exterior flow field simulation is feasible and reasonable. Both these demonstrate that exterior flow field simulation can provide effective guidance for in-vehicle aeroacoustic optimization in early styling stage, reducing cost and leadtime of vehicle development

Key words: aeroacoustic optimization, exterior rearview mirror, numerical simulation