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首页> 外文期刊>SAE International Journal of Passenger Cars - Mechanical Systems >Overset Mesh-Based Computational Investigations on the Aerodynamics of a Generic Car Model in Proximity to a Side-Wall
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Overset Mesh-Based Computational Investigations on the Aerodynamics of a Generic Car Model in Proximity to a Side-Wall

机译：基于侧壁通用汽车模型的空气动力学的超思想网格的计算调查

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This article discusses an approach to simulating a generic idealized car model (Ahmed body) moving in close proximity to a side-wall, using a transient Computational Fluid Dynamics (CFD) method. This phenomenon is very important in motorsports, where racing close to the safety barrier is common. Driving in close proximity to a side-wall alters the aerodynamic characteristics of the vehicle significantly; however, only a handful of published works exist in this area. Additionally, the experimental studies conducted in the past suffer from certain inadequacies, especially in terms of simulating the side-wall. This casts some uncertainty as to the relevance of these studies to the real-world problem. The present study attempts to imitate the real-world flow phenomenon by taking a nontraditional CFD approach of translating the body relative to the stationary surrounding fluid and side-wall instead of the classical method of flowing air over a stationary vehicle model. This was achieved by using a relatively new and computationally efficient meshing technique for overlapping grids called the "Overset" or "Chimera" mesh. The initial task was to accurately predict the flow over the rear slant of the 25° slant angle Ahmed body model, where previous studies struggled to achieve accurate enough predictions using the eddy-viscosity turbulence models. In the present study, Menter's Shear Stress Transport (SST) turbulence model, with modified closure coefficients, is utilized to accurately predict the flow characteristics in the initial separated shear layer and flow reattachment over the rear slant. Compared to the eddy-viscosity CFD simulations of an isolated 25° slant angle Ahmed body, as seen in the existing literature, the results presented in this article show significantly better correlations with the experimental results in terms of overall aerodynamic characteristics. The wall proximity studies show a strong influence of the presence of the wall on the overall aerodynamic characteristics of the vehicle body. When compared with the experimental studies, although both show similar trends, there exist significant differences between the experimental and CFD-predicted results, which tend to worsen as the body approaches the wall. These differences can be attributed to the fact that the CFD simulation of the flow around the side-wall is more realistic compared to the experimental implementation.
机译：本文讨论了一种使用瞬态计算流体动力学（CFD）方法模拟通用理想式汽车模型（AHMED主体）在侧壁上靠近靠近侧壁移动的方法。这种现象在赛车中非常重要，靠近安全屏障的赛车是常见的。靠近侧壁的靠近驱动，改变了车辆的空气动力学特性;但是，这一领域只有少数发布的作品。此外，过去进行的实验研究遭受某种不足，特别是在模拟侧壁方面。这对这些研究与现实世界问题的相关性产生了一些不确定性。本研究试图通过采用相对于固定的周围流体和侧壁的非传统CFD方法来模仿现实世界流动现象，而不是在固定车辆模型上流动空气的经典方法。这是通过使用相对新的和计算的有效的网格化技术来实现，用于重叠称为“监督”或“嵌合”网格的重叠网格。初始任务是准确地预测25°斜角艾哈迈德车身模型的后倾斜上的流动，其中先前的研究努力使用涡流湍流模型来实现准确的预测。在本研究中，利用改进的闭合系数的导师的剪切应力传输（SST）湍流模型用于精确地预测初始分离的剪切层中的流动特性，并在后倾斜上进行流动重新连接。与现有文献中所见的隔离25°倾斜角度αHeds体的涡粘度CFD模拟相比，本文中提出的结果显示出与整体空气动力学特征的实验结果明显更好地相关。壁邻近研究表明墙壁对车身的总空气动力学特性的存在强烈影响。与实验研究相比，虽然既显示出类似的趋势，但实验和CFD预测结果之间存在显着差异，因为身体接近墙壁时往往会恶化。与实验实施相比，这些差异可以归因于侧壁周围的流动的CFD模拟更加现实。

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