用应力混合涡模拟计算一般侧视镜的气动声学
Computational Aeroacoustics of a Generic Side View Mirror using Stress Blended Eddy Simulation
摘要：
本文采用应力混合涡模拟（SBES）和Ffowcs Williams和Hawkings（FW-H）方程耦合的方法对安装在平板上的普通侧视镜产生的气动噪声进行了数值研究。使用雷诺数（Re）为5.2 x10^5（基于模型直径）的标准化侧视镜进行网格评估研究。对镜面上的流体动力学压力波动，窗口和在不同的麦克风位置发出的声音的预测与先前公布的实验数据吻合得很好。此外，我们的数值计算结果表明，偏航的镜子靠近侧窗的结果，在流动被附着到后面的镜子，从而导致整体降低声压级（SPL）在几个接收器的位置。
英文摘要：
This paper presents a numerical investigation of aerodynamic noise generated by a generic side-view mirror mounted on a flat plate using the Stress Blended Eddy Simulation (SBES) coupled with the Ffowcs Williams and Hawkings (FW-H) equation. A grid evaluation study was performed using a standardised side-view mirror with a Reynolds Number (Re) of 5.2 x10^5 based on the diameter of the model. The predictions for hydrodynamic pressure fluctuations on the mirror, the window and the sound emitted at various microphone locations are in good agreement with previously published experimental data. In addition, our numerical results indicate that yawing the mirror closer to the side window results in the flow being attached to the rear of the mirror resulting in an overall reduction in Sound Pressure Level (SPL) at several receiver locations.
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