Aero-Acoustics Noise Prediction of 3D Treaded Tyre Using CFD

Tyre exterior noise legislation is becoming more stringent with time. To cater these requirements, it is very important to understand the tyre noise generation and enhancing mechanisms such as air pumping, turbulence, pipe resonance, horn effect in high frequency region from 500Hz to 4000Hz. These phenomena are affected by air flow around and within the tyre pattern hence, Computational Fluid Dynamics (CFD) based approach is chosen for tyre exterior noise. The CFD based methodology helps in fine tuning the tread pattern to reduce aero acoustic noise level which leads to reduction in the product design cycle time. In present study, 3d transient CFD aero-acoustic modelling approach is presented to capture the air-born noise mechanisms for frequency range of 1 kHz to 4 kHz using ANSYS Fluent. The given study is extension to previous validation study done [1]. In present study solid tyre mesh was also included which was not modeled in last study, also the mesh element used in present study is polyhedral mesh element instead of tetrahedral elements used in previous study [1]. Study validated against the anechoic tyre rolling noise test data which captures the air-born noise mechanisms for frequency range of 1 kHz to 4 kHz.