通过立体表面映射研究浅水中二维孤子气体的时空统计

IF 2.3 3区 工程技术 Q2 ENGINEERING, MECHANICAL
T. Leduque, E. Barthélemy, H. Michallet, J. Sommeria, N. Mordant
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引用次数: 0

摘要

Abstract We describe laboratory experiments in a 2D wave tank that aim at building up and monitor 2D shallow water soliton gas.通过使用两台相机的立体视觉,在一个大((\(\sim 100\,\text {m}^2\))域上获得了水面高程,分辨率为厘米。通过播种浮动粒子来获得表面纹理,并通过图像相关性来确定波场。利用这种设置,可以测量孤子的传播和多重相互作用,其详细程度是以前无法达到的。我们分析了斜孤子的传播,并将振幅衰减和局部入射与分析预测进行了比较。我们进一步提出了两种二维孤子气体的情况,它们分别来自随机入射的多线孤子(\(|\theta |<30^/circ/))和用JONSWAP谱强迫的不规则随机波(\(|\theta |<45^/circ/))。据我们所知,这是首次观测到重力波的随机二维孤子气体。在这两种情况下,马赫反射和马赫膨胀都会导致孤子主要沿垂直于造波者的方向传播。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Space–time statistics of 2D soliton gas in shallow water studied by stereoscopic surface mapping

Space–time statistics of 2D soliton gas in shallow water studied by stereoscopic surface mapping

Space–time statistics of 2D soliton gas in shallow water studied by stereoscopic surface mapping

We describe laboratory experiments in a 2D wave tank that aim at building up and monitor 2D shallow water soliton gas. The water surface elevation is obtained over a large (\(\sim 100\,\text {m}^2\)) domain, with centimeter-resolution, by stereoscopic vision using two cameras. Floating particles are seeded to get surface texture and determine the wave field by image correlation. With this setup, soliton propagation and multiple interactions can be measured with a previously unreachable level of detail. The propagation of an oblique soliton is analyzed, and the amplitude decay and local incidence are compared to analytical predictions. We further present two cases of 2D soliton gas, emerging from multiple line solitons with random incidence (\(|\theta |<30^\circ\)) and from irregular random waves forced with a JONSWAP spectrum (\(|\theta |<45^\circ\)). To our knowledge, those are the first observations of random 2D soliton gas for gravity waves. In both cases, Mach reflections and Mach expansions result in solitons that mainly propagate in directions perpendicular to the wavemakers.

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来源期刊
Experiments in Fluids
Experiments in Fluids 工程技术-工程:机械
CiteScore
5.10
自引率
12.50%
发文量
157
审稿时长
3.8 months
期刊介绍: Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.
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