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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Physical study of the 3-dimensional characteristics and free-surface properties of a breaking roller in bores and surges
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Physical study of the 3-dimensional characteristics and free-surface properties of a breaking roller in bores and surges

机译：孔和浪涌中断裂辊的三维特性和自由表面性能的物理研究

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摘要

Breaking surges and bores are observed during flood events, tidal bores and tsunamis propagating in rivers. The sudden increase in water depth generates an aerated and recirculating region, called the roller, whose turbulent behaviour is poorly understood. Based on ensemble-average analyses with multiple repetitions, this experimental work processed high-speed videos from multiple locations to characterise the spatial and temporal dynamics of the bore's roller. The results showed different air entrainment mechanisms for increasing Froude numbers, providing adapted formulae to predict the extension of the shear layer and the air-water boundary. Seen from above, the roller toe perimeter had an indented profile rapidly evolving in time, revealing a certain level of periodicity. A statistical analysis in terms of position of the roller toe, longitudinal fluctuations and instantaneous celerities allowed for a detailed characterisation of the turbulent surface fluctuations and threed-imensional properties of the breaking bore roller, leading to a better understating of the governing process.
机译：在洪水事件中，在河流中传播的潮汐孔和海啸期间观察到破碎浪涌和孔。水深的突然增加产生了一种被称为辊子的充气和再循环区域，其湍流行为理解得很差。基于具有多重重复的集合平均分析，该实验工作从多个位置处理了高速视频，以表征孔隙滚筒的空间和时间动态。结果表明，用于增加FRoude号码的不同空气夹带机构，提供适当的公式以预测剪切层和空气边界的延伸。从上方看，滚子脚趾周长有一个凹进的轮廓，速度快速发展，揭示了一定的周期性。在滚子脚趾的位置，纵向波动和瞬时圆锥矩形方面的统计分析允许进行湍流表面波动的详细表征和破碎的孔隙辊的流动性特性，从而更好地低估了控制过程。

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