Laboratory observation of coherent structures beneath microscale and large-scale breaking waves under wind action
Laboratory observation of coherent structures beneath microscale and large-scale breaking waves under wind action
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风作用下微尺度和大规模破碎波下相干结构的实验室观测
DOI：
10.1016/j.expthermflusci.2008.02.003
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发表时间：
2008
影响因子：
3.2
通讯作者：
K. Suh
中科院分区：
文献类型：
--
作者：
Sang;N. Mizutani;K. Suh
本研究提出的相干结构下产生的微尺度和大尺度溢出破碎波的实验研究结果。通过对3种不同风速下风成波的PIV速度数据进行分析，研究了两种不同破碎方式下风成波相干结构时空演化特征的相似性和差异性。对微尺度破碎机产生的拟序结构已有一些研究。然而，很少有人知道的相干结构下形成的大规模破碎波。在这项研究中，它表明，一个单一的强相干结构，其旋转方向是相同的波的轨道运动，是直接下面形成一个大规模的破碎波峰。这与在微尺度破碎机下发生的过程不同，微尺度破碎机产生一系列旋转方向不固定的相干结构。然而，相干结构的时空演化的总体演化特征在两个破波事件之间是定性相同的。随着微型或大型破碎机中的一个在PIV视场中前进，所产生的相干结构与预先存在的涡流相互作用，随后在破碎机的顺风侧消失或改革。
This study presents the results of an experimental investigation of coherent structures generated beneath microscale and large-scale spilling breaking waves. By analyzing PIV velocity data of wind-generated waves that are acquired at three different wind speeds, the similarity and difference in spatio-temporal evolving characteristics of the coherent structures according to the occurrence of the two types of wave breaking are investigated. There have been some researches on the coherent structures that are generated by microscale breaker. However, little has been known about the coherent structures formed underneath large-scale breaking waves. In this study, it is shown that a single strong coherent structure, whose direction of rotation is the same as the wave orbital motion, is formed immediately underneath a large-scale breaking crest. This is different from the processes occurring underneath microscale breakers that produce a series of coherent structures whose direction of rotation is not fixed. However, the overall evolving characteristics of the spatio-temporal evolution of the coherent structures are qualitatively the same between the two wave breaking events. As one of either microscale or large-scale breaker advances across the PIV field of view, the generated coherent structures interact with pre-existing vortices and subsequently disappear or reform in the downwind side of the breaker.
影响因子：
3.7
作者：
KOMORI, S;NAGAOSA, R;MURAKAMI, Y
通讯作者：
MURAKAMI, Y