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Unsteady Vehicle Aerodynamics during a Dynamic Steering Action: 2nd Report, Numerical Analysis

机译：动态转向动作期间不稳定的车辆空气动力学：第2次报告，数值分析

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Unsteady aerodynamic forces acting on vehicles during a dynamic steering action were investigated by numerical simulation, with a special focus on the vehicles' yaw and lateral motions. Two sedan-type vehicles with slightly different geometries at the front pillar, side skirt, under cover, and around the front wheel were adopted for comparison. In the first report, surface pressure on the body and total pressure behind the front wheel were measured in an on-road experiment. Then the relationships between the vehicles' lateral dynamic motion and unsteady aerodynamic characteristics during cornering motions were discussed. In this second report, the vehicles' meandering motions observed in on-road measurements were modeled numerically, and sinusoidal motions of lateral, yaw, and slip angles were imposed. The responding yaw moment was phase averaged, and its phase shift against the imposed slip angle was measured to assess the aerodynamic damping. It was found that the vehicle model with a higher sensory rating of high speed stability in the on-road test showed higher aerodynamic damping for the slip-angle change. The difference in flow structures on the sides of the vehicles and their contributions to the yaw and lateral motions were also investigated by visualizing the transient numerical results. Observations revealed that the vehicle with higher stability had thinner side flow structures, and flows around the front wheel house and rear-end corner contributed to restraining the rotating motion during the meandering motion. As a result, the discussions and analogy included in the previous report based on the restricted on-road measurements were confirmed in the present numerical analysis.
机译：通过数值模拟研究了在动态转向动作期间作用在车辆上的不稳定空气动力，特别关注车辆的偏航和横向运动。采用两个轿车型车辆，前支柱，侧裙，盖下方略有几何形状，并进行前轮。在第一个报告中，在路上实验中测量身体的表面压力和前轮后面的总压​​力。然后讨论了转向运动期间的车辆横向动态运动和不稳定的空气动力学特性之间的关系。在该第二报告中，在路上测量中观察到的车辆的蜿蜒动作是数值模拟的，并且施加横向，横摆和滑动角度的正弦运动。响应的横摆力矩是相平均值，测量其抵抗施加的滑移角的相移，以评估空气动力学阻尼。结果发现，在路上测试中具有较高的感觉额定值的车辆模型显示出较高的空气动力学阻尼，用于防滑角变化。通过可视化瞬态数值结果，还研究了车辆侧面上的流动结构的差异及其对横向运动的贡献。观察结果表明，具有较高稳定性的车辆具有更薄的侧面流动结构，并且围绕前轮房屋和后端角流动有助于在曲折运动期间抑制旋转运动。结果，在本数值分析中确认了基于受限制的路线测量的先前报告中包含的讨论和类比。

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