Plunging breakers. Part 1. Analysis of an ensemble of wave profiles
Plunging breakers. Part 1. Analysis of an ensemble of wave profiles
复制标题
插入式断路器。
DOI：
10.1017/jfm.2023.379
复制
发表时间：
2023
影响因子：
3.7
通讯作者：
Duncan, J.H.
中科院分区：
文献类型：
--
作者：
Erinin, M.A.;Liu, X.;Wang, S.D.;Duncan, J.H.
本文对三种机械产生的冲击破碎波的动力学和液滴生成进行了实验研究。在本文（第1部分）中，三个破碎机的动力学进行了研究，通过测量的演变过程中，他们的自由表面轮廓的10个重复破碎事件，每个波。这些波是由三个造波机运动产生的分散聚焦波包产生的，这三个造波机运动的主要区别在于它们的整体振幅的微小变化。断路器的配置文件进行了测量与电影的激光诱导荧光技术，涵盖了约一个断路器波长的流向区域，并在3.4断路器周期的时间。对齐的轮廓数据用于创建整体平均表面高度的时空图以及相对于瞬时平均轮廓的局部法向距离和局部弧长的标准偏差。结果发现，平均值和标准差地图包含强烈相关的本地化功能，并表明从层流到湍流的过渡是一个高度可重复的过程。高标准偏差区域包括由倾入射流冲击产生的飞溅和随后在断裂区域前部的飞溅冲击，以及在射流尖端冲击的时刻在倾入射流下夹带的气穴到达表面并爆裂的位置。在第2部分（Erinin等人，流体力学杂志，vol.967，2023，A36），这些特征用于解释液滴数量、直径和速度分布的各种特征。
An experimental study of the dynamics and droplet production in three mechanically generated plunging breaking waves is presented in this two-part paper. In the present paper (Part 1), the dynamics of the three breakers are studied through measurements of the evolution of their free surface profiles during 10 repeated breaking events for each wave. The waves are created from dispersively focused wave packets generated with three wave maker motions that differ primarily by small changes in their overall amplitude. Breaker profiles are measured with a cinematic laser-induced fluorescence technique covering a streamwise region of approximately one breaker wavelength and over a time of 3.4 breaker periods. The aligned profile data is used to create spatio-temporal maps of the ensemble average surface height and the standard deviation of both the local normal distance and the local arc length relative to the instantaneous mean profile. It is found that the mean and standard deviation maps contain strongly correlated localized features and indicate that the transition from laminar to turbulent flow is a highly repeatable process. Regions of high standard deviation include the splash created by the plunging jet impact and subsequent splash impacts at the front of the breaking region as well as the site where the air pocket entrained under the plunging jet at the moment of jet tip impact comes to the surface and pops. In Part 2 (Erinin et al., J. Fluid Mech., vol. 967, 2023, A36), these features are used to interpret various features of the distributions of droplet number, diameter and velocity.
登录
查看更多内容
在长波占主导地位的情况下短小波的色散
影响因子：
3.7
作者：
O. Phillips
通讯作者：
O. Phillips
影响因子：
3.7
作者：
Mostert, W.;Popinet, S.;Deike, L.
通讯作者：
Deike, L.
影响因子：
3.7
作者：
Pierre Lubin;S. Glockner
通讯作者：
Pierre Lubin;S. Glockner
影响因子：
3.7
作者：
Deike, Luc;Popinet, Stephane;Melville, W. Kendall
通讯作者：
Melville, W. Kendall
影响因子：
3.7
作者：
Deike, Luc;Pizzo, Nick;Melville, W. Kendall
通讯作者：
Melville, W. Kendall