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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Statistical structure and mean dynamics of developing turbulent shear-wake flows
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Statistical structure and mean dynamics of developing turbulent shear-wake flows

机译：湍流剪切尾流的统计结构和平均动力学

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摘要

Shear-wake flows formed from the interaction of two turbulent boundary layers are investigated. Primary focus is on the near-field downstream of the splitter plate. Two velocity ratios and two trailing edge geometries are explored via well-resolved hotwire traverses. Comparison with boundary layer data reveals that the loss of the no-slip condition is at first most apparent in the wall-normal velocity fluctuations. Estimates of the terms in the mean momentum equation are examined. Post-separation, the inertial terms in the mean momentum equation rapidly become dominant throughout the flow. Farther downstream the mean effect of turbulent inertia continues to change sign between the wake center and the freestream, as it does between the wall and freestream in the boundary layer. Unlike in the boundary layer, the mean and turbulent inertia terms retain leading order importance over the viscous force term everywhere.
机译：研究了由两个湍流边界层相互作用形成的剪切尾流。主要关注于分离板下游的近场。通过良好解析的热线遍历，探索了两个速度比和两个后缘几何形状。与边界层数据的比较表明，首先在壁面法向速度波动中最明显地发现了防滑条件的损失。检查平均动量方程中各项的估计。分离后，平均动量方程中的惯性项在整个流动过程中迅速占主导地位。在更下游，湍流惯性的平均效应会继续改变尾流中心和自由流之间的符号，就像边界层中壁和自由流之间的符号一样。与边界层不同，均值和湍流惯性项在任何地方都比粘性力项保持领先的重要性。

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