Experimental investigation of turbulence generated by breaking waves in water of intermediate depth
Experimental investigation of turbulence generated by breaking waves in water of intermediate depth
复制标题
中等深度水中破碎波产生湍流的实验研究
DOI：
10.1063/1.870198
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发表时间：
1999
影响因子：
4.6
通讯作者：
P. Liu
中科院分区：
文献类型：
--
作者：
Kuang‐An Chang;P. Liu
本文报告了一组中等深度水中破浪的实验室数据。在水深 h 为 20 cm 时产生波高为 14.5 cm、波长为 121 cm 的单色波列。波列在距波发生器约2h的距离处一致破裂。采用粒子图像测速（PIV）技术测量了二维垂直平面上破碎波作用下的瞬时速度场。通过重复相同的实验二十次并执行系综平均值，可以计算平均速度、平均涡度、湍流强度以及其他流动特性（例如雷诺应力和平均应变率）。在含气区域之外，气泡密度较高，实验数据表明，平均涡度与（C/h）（≈6 s−1）处于同一数量级，其中C为相速度。曝气区域外的最大湍流强度约为 0.1 C (≈11...
This paper reports a set of laboratory data for breaking waves in the water of intermediate depth. A monochromatic wave train with a wave height of 14.5 cm and a wavelength of 121 cm was generated in a water depth, h, of 20 cm. The wave train breaks consistently at a distance of about 2h from the wave generator. The instantaneous velocity fields under the breaking waves on a two-dimensional vertical plane were measured by using the particle image velocimetry (PIV) technique. By repeating the same experiments twenty times and performing the ensemble average, mean velocity, mean vorticity, turbulence intensity, and other flow properties such as the Reynolds stress and the mean strain rate were calculated. Outside the aerated region, where the density of air bubbles is high, the experimental data show that the mean vorticity was of the same order of magnitude as (C/h) (≈6 s−1) with C being the phase speed. The maximum turbulence intensity outside the aerated region was in the order of magnitude of 0.1 C (≈11...