Buffeting Noise Characteristics and Control of Automobile Side Window

The computational fluid dynamics (CFD) software STAR-CCM+, Large Eddy Simulation (LES) method, and the Dynamic Smagorinsky-Lilly sub-lattice Model (DSLM) are used to study the buffeting noise characteristics of automobile side windows. Buffeting noise control methods are studied, and a comparison with experimental data verified the correctness of the simulation. Results show that periodic vortexing of the window opening area causes the strong pressure pulsation in the passenger compartment, and the combined effect of two mechanisms, namely, acoustic feedback and Helmholtz resonance, generates the buffeting noise. The sound pressure level (SPL) of buffeting noise produced by opening only the front window is lower than that of the rear window; Adding a rear mirror convex structure and a rain baffle structure reduces the buffeting noise SPL of the front window by 4.5 dB and 7.8 dB, respectively; Adding a convex structure and a non-smooth structure in the B pillar reduces the buffeting noise SPL of the rear window by 3.8 dB and 2.2 dB, respectively.