<p>Flow fields obtained by large-eddy simulations around a rotating tire with the grooves are investigated to clarify the relationships between the shape parameters of the grooves and the directivity of aeroacoustic noise and to clarify noise sources. To obtain acoustic field around the rotating tire, the large-eddy simulations using the sixth-order compact finite difference scheme and the tridiagonal filter are performed. The six computational cases including the case without groove are considered in the present study. The sound pressure level (SPL) of the computational result of a grooveless tire with the experimental result is compared. The comparison shows that both SPLs are at comparable levels. Additionally, the effect of grid resolution on SPL distribution over the ground and distance attenuation are discussed, and the validity of computational results are confirmed. After the validation, we compare the SPL distribution on the ground and discuss the difference in sound directivity depending on the presence or absence of grooves and the shape of the grooves. Regarding the effect of the presence or absence of grooves on the sound field, the SPL of the front part of the tire decreases by the presence of a groove. In addition, by investigating the correlation coefficient of the SPL of the sound field around the grooved tire with each shape parameter, the following are clarified. The influence of the "top width" on the sound field is large and the sound of the tire front becomes slightly louder when the "top width" increases from the baseline groove shape. In the final paper, proper orthogonal decomposition analysis will be added in order to clarify the noise sources.</p>

Analysis of Aeroacoustic Generated From a Rotating Tire With a Longitudinal Groove Using Large-Eddy Simulation

Paper Proceedings: https://asmedigitalcollection.asme.org/FEDSM/FEDSM2021/volume/85284

ASME 2021 Fluids Engineering Division Summer Meeting (FEDSM2021)

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