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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Robust classification for the joint velocityintermittency structure of turbulent flow over fixed and mobile bedforms
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Robust classification for the joint velocityintermittency structure of turbulent flow over fixed and mobile bedforms

机译：固定床和移动床上湍流的联合速度间歇结构的鲁棒分类

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摘要

Two datasets of turbulence velocities collected over different bedform types under contrasting experimental conditions show similarity in terms of velocity-intermittency characteristics and suggest a universality to the velocity-intermittency structure for flow over bedforms. One dataset was obtained by sampling flow over static bedforms in different locations, and the other was based on a static position but mobile bedforms. A flow classification based on the velocity-intermittency behaviour is shown to reveal some differences from that based on an analysis of Reynolds stresses, boundary layer correlation and turbulent kinetic energy. This may be attributed to the intermittency variable, which captures the local effect of individual turbulent flow structures. Locations in the wake region or the outer layer of the flow are both shown to have a velocity-intermittency behaviour that departs from that for idealized wakes or outer layer flow because of the superposition of localized flow structures generated by bedforms. The combined effect of this yields a velocity-intermittency structure unique to bedform flow. The use of a time series of a single velocity component highlights the potential power of our approach for field, numerical and laboratory studies. The further validation of the velocity-intermittency method for non-idealized flows undertaken here suggests that this technique can be used for flow classification purposes in geomorphology, hydraulics, meteorology and environmental fluid mechanics.
机译：在不同的实验条件下，在不同床形类型下收集的两个湍流速度数据集在速度-间歇性特征方面显示出相似性，并暗示了流过床形的速度-间歇性结构的普遍性。一个数据集是通过对不同位置的静态床形上的流量进行采样而获得的，另一个数据集是基于静态位置而不是移动床形的。结果表明，基于速度-间歇性行为的流分类显示出与基于雷诺应力，边界层相关性和湍动能的分析结果有所不同。这可能归因于间歇变量，该变量捕获了单个湍流结构的局部影响。由于床形所产生的局部流动结构的叠加，在尾流区域或流动的外层中的位置均显示为具有间歇性，这与理想的尾流或外层流动的速度-间歇性行为不同。这种综合效果产生了床形流特有的速度-间歇结构。单个速度分量的时间序列的使用凸显了我们的方法在野外，数值和实验室研究中的潜在能力。此处对非理想流动的速度间歇方法的进一步验证表明，该技术可用于地貌，水力学，气象学和环境流体力学中的流分类目的。

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