Numerical simulation of exterior flow field and aerodynamic noise caused by different rearview mirror edge structures was conducted by the large eddy simulation(LES). The results show that various mirror cover edge structures have an effect on the airflow velocity and direction

affecting greatly the rear flow field of rearview mirror and sound pressure level at monitoring point. Compared with the original model

the vortex flow behind model 1 is farther away from the body surface

helping to reduce aerodynamic noise. Sound pressure level drops by almost 10dB in 1/3 octave center frequency at a monitoring point. The vortex flow behind model 2 is separated and located nearer to the body surface

leading to rise of aerodynamic noise. The mirror cover edge structure of model 1 improves the flow field and aerodynamic noise around the rearview mirror and A-pillar.