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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Experimental and numerical investigation of low-drag intervals in turbulent boundary layer
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Experimental and numerical investigation of low-drag intervals in turbulent boundary layer

机译：APS -70TH流体动力学APS划分年会 - 事件 - 湍流边界层低阻力间隔的实验性和数值研究

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摘要

It has been widely investigated that there is a substantial intermittency between high and low drag states in wall-bounded shear flows. Recent experimental and computational studies in a turbulent channel flow have identified low-drag time intervals based on wall shear stress measurements. These intervals are a weak turbulence state characterized by low-speed streaks and weak streamwise vortices. In this study, the spatiotemporal?dynamics of low-drag intervals in a turbulent boundary layer is investigated using experiments and simulations. The low-drag intervals are monitored based on the wall shear stress measurement. We show that near the wall conditionally-sampled mean velocity profiles during low-drag intervals closely approach that of a low-drag nonlinear traveling wave solution as well as that of the so-called maximum drag reduction asymptote. This observation is consistent with the channel flow studies. Interestingly, the large spatial stretching of the streak is very evident in the wall-normal direction during low-drag intervals. Lastly, a possible connection between the mean velocity profile during the low-drag intervals and the Blasius profile will be discussed.
机译：已经广泛研究了壁限剪切流中的高和低阻力状态之间存在大幅间歇性。湍流通道流中最近的实验和计算研究已经识别基于壁剪切应力测量的低拖动时间间隔。这些间隔是一种弱湍流状态，其特征在于低速条纹和弱流动涡流。在这项研究中，使用实验和模拟研究了湍流边界层中的低压间隔的动态。基于墙面剪切应力测量监测低压间隔。我们示出了在低阻力间隔期间靠近墙条件采样的平均速度分布，密切接近低阻力非线性行驶波解决方案以及所谓的最大阻力减少渐近渐近渐近的速度。该观察结果与通道流程研究一致。有趣的是，在低压间隔期间，条纹的大的空间拉伸在壁正常方向上非常明显。最后，将讨论低拖动间隔和Blasius分布期间平均速度分布之间的可能连接。

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