An Assessment of Detached-Eddy Simulations of Unsteady Crosswind Aerodynamics of Road Vehicles
An Assessment of Detached-Eddy Simulations of Unsteady Crosswind Aerodynamics of Road Vehicles
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DOI：
10.1007/s10494-011-9333-4
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发表时间：
2011-03
期刊：
影响因子：
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通讯作者：
T. Favre;Gunilla Efraimsson
中科院分区：
文献类型：
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作者：
T. Favre;Gunilla Efraimsson
本文探讨了分离涡模拟（DES）在工业应用中模拟非定常紊流空气动力学的有效性。本文利用商业软件STAR-CD，分别在逆风、定常逆风和时变阵风三种情况下，对两种不同类型的网格进行了绕流分析。基于飞行器长度，所研究的流动情况的典型雷诺数为2.0 ·106。在阵风过程中的流动结构的时间发展的多面体网格与六面体网格的性能进行了评估。从给出的结果可以得出结论，气动力系数可以可靠地计算使用多面体和六面体网格，虽然在尾流中的精细湍流结构更好地捕捉与六面体网格。为了解决流动尺度，使用DES等湍流方法为设计地面车辆提供了重要的见解，并且由于所涉及的合理计算时间，因此可以预见在不久的将来将被纳入设计过程中。
In this paper, the availability of Detached-Eddy Simulations (DES) for simulating unsteady crosswind aerodynamics in industrial applications is explored and reported. The flow around a simple car geometry under headwind, steady crosswind and time-dependent wind gust respectively, is analysed for two different types of mesh using a commercial software, STAR-CD. The typical Reynolds number of the flow cases studied is 2.0 · 106based on the vehicle length. The performances of polyhedral meshes together with a comparable hexahedral mesh are evaluated for capturing the time development of the flow structures during a gust. From the results presented, it can be concluded that the aerodynamic coefficients can be reliably calculated using both polyhedral and hexahedral meshes, although the fine turbulent structures in the wake are better captured with the hexahedral mesh. Using turbulence methods like DES in order to resolve the flow scales provides a significant insight for designing a ground vehicle and, due to the reasonable computational times involved, can hence be foreseen to be incorporated in a design process in a near future.