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首页> 外文会议>2002 ASME International Mechanical Engineering Congress and Exposition , Nov 17-22, 2002, New Orleans, Louisiana >DEVELOPMENT OF LARGE-EDDY SIMULATION FOR VEHICLE AERODYNAMICS
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DEVELOPMENT OF LARGE-EDDY SIMULATION FOR VEHICLE AERODYNAMICS

机译：汽车空气动力学大涡模拟的开发

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The feasibility of use of large-eddy simulation (LES) in external vehicle aerodynamics is investigated. The computational cost needed for LES of the full size car at road conditions is beyond the capability of the computers in the near future (Krajnovic (2002)). Since LES cannot be used for quantitative prediction of this flow, i.e. obtaining the aerodynamic forces and moments, an alternative use of this technique is suggested that can enhance the understanding of the flow around a car. It is found that making LES of the flow around simplified car-like shapes at lower Reynolds number can increase our knowledge of the flow around a car. Two simulations are made, one of the flow around a cube and the other of the flow around a simplified bus. The former simulation proved that LES with relatively coarse resolution and simple inlet boundary condition can provide accurate results. The latter simulation resulted in flow in agreement with experimental observations and displayed some flow features that were not observed in experiments or steady simulations of such flows. This simulation gave us possibility to study the transient mechanisms that are responsible for the aerodynamic properties of a car. The knowledge gained from this simulation can be used by the stylist to tune the aerodynamics of the car's design but also by the CFD specialists to improve the turbulence models.
机译：研究了在外部车辆空气动力学中使用大涡模拟（LES）的可行性。在不久的将来，全尺寸汽车的LES所需的计算成本超出了计算机的能力（Krajnovic（2002））。由于LES无法用于对该流量的定量预测，即获得空气动力和力矩，因此建议使用该技术的另一种方法，以增强对汽车周围流量的理解。发现以较低的雷诺数围绕简化的类似汽车的形状流动的LES可以增加我们对围绕汽车流动的了解。进行了两种模拟，一种模拟是围绕立方体的流动，另一种是围绕简化总线的流动。以前的模拟证明，具有相对粗略分辨率和简单入口边界条件的LES可以提供​​准确的结果。后者的模拟结果使流动与实验观察结果一致，并显示了一些在流动或稳态模拟中未观察到的流动特征。这种模拟使我们有可能研究影响汽车空气动力学特性的瞬态机理。从该模拟中获得的知识可以由设计师用于调整汽车设计的空气动力学性能，也可以由CFD专家用于改善湍流模型。

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