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Automotive Flow and Acoustic Predictions using Large Eddy Simulations

机译:使用大涡模拟的汽车流量和声学预测

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摘要

The external flow field and the aeroacoustic generated by automotive appendices such as the A-pilar rain gutters and outside-rear-view mirrorrs are simulated using Large Eddy Simulation (LES). In the present study the simulations were carried out for three rain gutter geometries and two different mirror models. In these cases the simulation results were compared with the existing experimental data. For the flow around the gutters the agreement was found to be very good (for all three configurations) for the entire range of frequency measured. In addition, the present numerical simulations appear to be more accurate than previously published results obtained for the same geometries using RANS approach. Finally, the simulations of two outside rear view mirror configurations on a flat plate were completed. Calculations carried out on coarse and fine grids were compared to experimental data. In this case averaged pressure and velocity magnitude were compared again demonstrating the accuracy of the present approach.
机译:使用大涡模拟(LES)对汽车附件(例如A柱雨水槽和后视镜)产生的外部流场和空气声进行模拟。在本研究中,对三个雨水槽几何形状和两个不同的反射镜模型进行了仿真。在这些情况下,将模拟结果与现有实验数据进行比较。对于排水沟周围的流动,发现在整个测量频率范围内(对于所有三种配置)非常一致。此外,当前的数值模拟似乎比以前使用RANS方法针对相同几何图形获得的结果更准确。最后,完成了平板上两个外部后视镜配置的模拟。将在粗网格和细网格上进行的计算与实验数据进行比较。在这种情况下,再次比较了平均压力和速度大小,证明了本方法的准确性。

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