海底物体运动生成内波问题研究  

Investigation of the problem of internal waves generated by the movement of a seafloor object

作　　者：李林杰 赵彬彬[1] 段文洋[1] LI Linjie;ZHAO Binbin;DUAN Wenyang(College of Shipbuilding Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]哈尔滨工程大学船舶工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2023年第9期1487-1493,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(11972126);黑龙江省头雁行动计划.

摘　　要：为研究物体在海底运动产生大幅内孤立波问题,本文基于商业软件STAR-CCM+,选用无粘模型,求解欧拉方程,采用流体体积法监测内波界面,对网格、时间步长开展收敛性分析,得到STAR-CCM+计算的内波波面空间分布收敛结果与全非线性势流模型结果高度吻合。研究了物体形状对于生成内波的影响,对比了上下层液体密度比分别为0.787和0.95时,刚盖假设与自由表面这2种不同边界条件下的内波波面空间分布结果,研究表明:当上下层液体的密度比不接近1时,必须考虑自由面效应对内波波幅和波速的影响。In order to study the problem of large-amplitude internal solitary waves generated by objects moving on the ocean floor,this paper assesses an inviscid model and solves the Euler equation using the commercial software STAR-CCM+.The volume of fluid method is used to monitor the internal wave,and convergence analysis is conducted on the grid and time step.Convergence results of the spatial distribution of the internal wave surface calculated by STAR-CCM+are in agreement with those of the fully nonlinear potential flow model.The influence of the object’s shape on the generation of internal waves is then investigated.Finally,the spatial distribution results of internal solitary waves under two different boundary conditions,namely,the rigid cover assumption and the free surface,are compared when the density ratio of the upper and lower layers is 0.787 and 0.95,respectively.The influence of the free surface effect on the internal wave amplitude and speed must be considered when the density ratio of the upper and lower liquids is not close to 1.

关 键 词：内孤立波 海底物体运动 物体形状 自由面效应 刚盖假设 多相流 密度分层流 数值模拟 

分 类 号：O352[理学—流体力学]