Computational analysis of aeroacoustic noise generated from a rotating tire with a longitudinal groove

It is known that acoustic waves which is higher than 1000 Hz are generated from a rotating tire, and one possibility of their generation mechanism is aeroacoustic effect. The main objective of this study is to understand the generation mechanism and acoustic wave characteristic for realization of low noise tire. For this main objective, the effects of a longitudinal groove shape on acoustic field are investigated in the present study. Three cases, without a groove case (slick tire), a small longitudinal groove and large longitudinal groove are analyzed by large eddy simulations. The result shows that compression or expansion of the vortex is alleviated and weaken sound source by attaching a groove on tire surface. On the other hand, we also confirm that a groove contributes generation of new fluctuation and affects the spread of fluctuations. It can be considered that acoustic fields of front side of tire are affected by a tradeoff between the effect of compression or expansion of the vortex and those of ...