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Direct numerical simulation of a turbulent flow over an axisymmetric hill

机译：轴对称山上湍流的直接数值模拟

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Direct numerical simulation (DNS) of a turbulent flow over an axisymmetric hill has been carried out to study the three-dimensional flow separation and reattachment that occur on the lee-side of the geometry. The flow Reynolds number is Re_H = 6500, based on free-stream quantities and hill height (H). A synthetic inflow boundary condition, combined with a data feed-in method, has been used to generate the turbulent boundary layer approaching to the hill. The simulation has been run using a typical DNS resolution of Δx = 12.5, Δz = 6.5, and Δy_1 = 1.0 and about 10 points in the viscous sublayer. It was found that a separation bubble exists at the foot of the wind-side of the hill and the incoming turbulent boundary layer flow undergoes re-laminarization process around the crest of the hill. These lead to a significant flow separation at the lee-side of the hill, where a very large primary separation bubble embedded with a smaller secondary separations have been captured. The present low-Re simulation reveals some flow features that are not observed by high-Re experiments, thus is useful for future experimental studies.
机译：已经对轴对称山丘上的湍流进行了直接数值模拟（DNS），以研究在几何形状的背侧发生的三维流分离和重新附着。根据自由流数量和山高（H），流雷诺数为Re_H = 6500。综合入流边界条件与数据馈入方法相结合，已用于生成接近丘陵的湍流边界层。使用典型的DNS分辨率Δx= 12.5，Δz= 6.5和Δy_1= 1.0以及粘性子层中的大约10个点进行了模拟。发现在山的风侧的脚下存在分离气泡，并且进入的湍流边界层流在山的波峰周围经历了再层化过程。这些导致在小山的背风侧发生明显的流动分离，在该处，已经捕获到嵌有较小次要分离的非常大的主要分离气泡。当前的低Re模拟揭示了一些高high实验未观察到的流动特征，因此对于将来的实验研究很有用。

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