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实验室造波条件对内孤立波发展影响的直接数值模拟
叶潇潇1, 游景皓2, 宋金宝1
1.浙江大学海洋学院物理海洋与遥感研究所;2.四川大学水力学与山区河流开发保护国家重点实验室
摘要:
内孤立波具有尺度大、能量集中的特点,其引起流场和密度场的迅速变化会对海洋工程结构物以及水下潜体造成严重威胁。因此研究不同造波条件下生成的内孤立波运动的流场特征具有重要的学术意义和实际应用价值。本文采用直接数值模拟方法和给定的初始密度场密度跃迁函数,对重力塌陷激发内孤立波的运动过程进行研究,详细探讨了不同造波条件下,激发产生的内孤立波波型、涡度、振幅和水平速度等流场特征。结果表明:(1)本文采用的直接模拟数值方法能够模拟内孤立波传播过程中的密度界面波型反转现象;(2) 从定性和定量的角度,证实了不稳定内孤立波传播过程中存在能量的向后传递;(3) 对于相同的台阶深度(水闸两侧初始密度界面的高度差),初始涡流保持相同,但是随着上下层水深比的减小,其强度下降显著;(4)台阶深度对初始涡流的垂直结构的影响要大于上下层水深比,且台阶深度对内孤立波的振幅、水平速度的影响显著。
关键词:  内孤立波  初始条件  重力塌陷  直接数值模拟
DOI:10.11693/hyhz20200600157
分类号:
基金项目:国家重点基础研究发展计划项目,批准号:2017YFA0604102; 2016YFC1401404
USING DIRECT NUMERICAL SIMULATION TO STUDY THE EFFECT OF LABORATORY WAVE-MAKING CONDITIONS ON THE DEVELOPMENT INTERNAL SOLITARY WAVES
Ye Xiaoxiao1, Yu Chinghao2, Song Jinbao1
1.Institute of Physical Oceanography and Remote Sensing, Ocean College,Zhejiang University;2.State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University
Abstract:
Internal solitary waves have the characteristics of large scale and concentrated energy, which causes rapid changes in the flow field and density field, which will pose a serious threat to marine engineering structures and underwater submersibles. Therefore, studying the flow field characteristics of internal solitary wave motion generated under different conditions has important academic significance and practical application value. This paper uses the direct numerical simulation method and a given initial density field density transition function to study the motion process of gravity-collapsed internal solitary waves. This paper discusses the flow field characteristics of internal solitary waves generated in different wave-making conditions, such as waveform, vorticity, amplitude and horizontal velocity. The results show that the direct simulation numerical method used in this paper can simulate the density interface waveform inversion during the process of internal solitary wave propagation. In addition, from the qualitative and quantitative perspectives, this study confirms the backward transmission of energy during the propagation of unstable internal solitary waves. The initial vortex remains identical for the same step depth but the decrease in its strength is significant as the depth of upper layer increases. The step depth influences the vertical structure of the initial vortex more than the depth ratio of the upper and lower layer does on wave generation. Moreover, step depth has a significant effect on the amplitude and horizontal velocity on wave generation.
Key words:  internal solitary wave  initial conditions  gravity collapse  direct numerical simulation
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