Numerical Study on the Mechanism of Wind Noise Generation About a Car-Like Body

[+] Author and Article Information
Ming Zhu, Hideaki Miyata

Department of Naval Architecture and Ocean Engineering, University of Tokyo, Tokyo, Japan

Yuji Hanaoka

Body Engineering Department, ISUZU Motors, Ltd., Kanagawa, Japan

J. Fluids Eng 116(3), 424-432 (Sep 01, 1994) (9 pages) doi:10.1115/1.2910294 History: Received April 03, 1993; Revised March 14, 1994; Online May 23, 2008


Three-dimensional flow separation about the sharp-edged front-pillar of a car-like body at high cruising speed is numerically studied. A time-dependent and full Navier-Stokes simulation is carried out for the understanding of mechanism of wind noise generation due to the vortical flow motions. The surface pressure fluctuations on the front-side window are examined in terms of wind noise, based on a simplified Lighthill-Curle’s equation. The simulated results are validated regarding the numerical grid resolution and assessed by comparison with the conventional acoustic theory. The analyses of the simulated flow-field data indicate that there is a strong relationship between the vortical motions associated with the flow separation and the surface pressure fluctuations on the front-side window. The bifurcations of flow geometry, such as the breakdown of a separated vortex as well as the vortex-vortex interaction, seem to be most strongly related to the production of surface pressure fluctuations.

Copyright © 1994 by The American Society of Mechanical Engineers
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