Analysis of Car Sunroof Buffeting Noise Based on Scale-adaptive Simulation

doi:10.3901/JME.2016.12.107

Abstract

Abstract: Scale adaptive simulation (SAS) turbulence model is employed to simulate a simplified sunroof noise. Compared with the experimental data, the accuracy of the numerical computational method based on the SAS turbulence model is validated. Aiming at the problem of vehicle sunroof buffeting noise, the numerical simulations of different inflow velocity are conducted. The results indicate that vehicle sunroof buffeting noise is mainly caused by aeroacoustic feedback and Helmholtz resonance. When Helmholtz resonance occurs, the characteristics of sunroof buffeting are revealed through the analysis of the monitor’s pressure caused by vortex shedding from the leading edge in one period. An intensive study on shear layer instability is conduct, for the case of the strongest sunroof buffeting noise, the root mean square of the velocity fluctuations in the streamwise and transverse directions are all the biggest, respectively, which indicate that the disturbance of shear layer is amplified by Helmholtz resonance and thus generates the strongest buffeting energy. As different number of passengers in cabin increases under the wind condition of Helmholtz resonance, the peak sound pressure levels of the buffeting somewhat decrease, and the associated frequencies have little change.

Key words: aeroacoustic feedback, characteristics, Helmholtz resonance, scale-adaptive simulation, sunroof buffeting noise

CLC Number:

U461

YANG Zhendong, GU Zhengqi. Analysis of Car Sunroof Buffeting Noise Based on Scale-adaptive Simulation[J]. Journal of Mechanical Engineering, 2016, 52(12): 107-117.

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