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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 >Wave influence on turbulence length scales in free surface channel flows
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Wave influence on turbulence length scales in free surface channel flows

机译：波浪对自由表面通道流中湍流长度尺度的影响

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In order to predict sediment movements in coastal environments, the interaction between these particles and turbulence should be better understood. Although previous studies have particularly shown the importance of the turbulence length scales on sediment transport for current flows, few measurements have been made on wave/current flows. The purpose of our experiments is to get a better knowledge on wave action on these characteristic length scales. For this study, in the context of a grid-generated turbulence, we aimed to describe evolution of turbulence macro and micro scales in two kinds of free surface flow. Indeed, current and wave/current flows are studied. Two data analysis techniques are used to estimate these characteristic length scales depending on flow conditions. Whereas a well-known energetic method is used for current flow, a specific analysis based on correlation measurements is lead to describe temporal evolution of turbulence length scale over the wave period. As a main result, we show that the free surface causes a vortex stretching for current flow and that turbulence length scales follow a periodic evolution with a frequency which is twice as the swell period. The turbulence length scales also depend on wave period and amplitude. (C) 2004 Elsevier Inc. All rights reserved.
机译：为了预测沿海环境中的泥沙运动，应该更好地理解这些颗粒与湍流之间的相互作用。尽管先前的研究特别显示了湍流长度尺度对泥沙流对于电流的重要性，但很少对波浪/电流进行测量。我们的实验目的是在这些特征长度尺度上更好地了解波浪作用。对于本研究，在网格生成湍流的背景下，我们旨在描述两种自由表面流中湍流宏观和微观尺度的演变。实际上，已经研究了电流和波/电流。两种数据分析技术用于根据流动条件估算这些特征长度尺度。尽管众所周知的能量方法用于电流流动，但是基于相关测量的特定分析导致描述了波浪周期内湍流长度尺度的时间演变。作为主要结果，我们表明，自由表面引起电流流动的涡旋拉伸，湍流长度尺度遵循周期性发展，其频率是膨胀周期的两倍。湍流长度尺度也取决于波周期和振幅。 （C）2004 Elsevier Inc.保留所有权利。

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