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首页> 外文期刊>Journal of Mechanical Science and Technology >Low-Reynolds number flow computation for eppler 387 wing using hybrid DES/transition model
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Low-Reynolds number flow computation for eppler 387 wing using hybrid DES/transition model

机译:使用混合DES /过渡模型的eppler 387机翼的低雷诺数流计算

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Detached eddy simulations were successfully applied to assess fully-turbulent external flows. DES exploits the advantages of RANS modeling inside of the boundary layer and large eddy simulation outside of the turbulent boundary layer. The DES results have generally shown excellent solutions for unsteady wake flows, but not for transitional flows because DES is fundamentally based on a fully turbulent assumption. A hybrid model that combines the DES and gamma-Re-theta transition models is hereby proposed to simulate both the unsteady wake and the laminar/turbulent transition inside of the boundary layer. The numerical results provided by the simulation are compared to experimental data obtained from an Eppler 387 airfoil. The results indicate that the hybrid DES/Transition model predicts both strong laminar/turbulent transition phenomena including the laminar separation bubble and flow separation at high angles of attack.
机译:分离涡流模拟已成功地用于评估完全湍流的外部流动。 DES利用边界层内部的RANS建模和湍流边界层外部的大涡模拟的优势。 DES的结果通常显示出对于非稳定尾流的出色解决方案,但对于过渡流却没有,因为DES基本上是基于完全动荡的假设。因此,提出了一种结合了DES和伽马-Re-Theta过渡模型的混合模型,以模拟边界层内部的非稳定尾流和层流/湍流过渡。将模拟提供的数值结果与从Eppler 387机翼获得的实验数据进行比较。结果表明,混合DES /过渡模型可预测强层流/湍流过渡现象,包括层流分离气泡和高迎角流动分离。

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