内孤立波在密度连续变化数值水槽中的模拟方法研究  

Simulation Method of Internal Solitary Waves in Numerical Tank of Continuously Stratified

作　　者：杨永春[1] 董崇政 郭春龙 Yang Yongchun;Dong Chongzheng;Guo Chunlong(College of Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学工程学院,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2023年第10期30-37,共8页Periodical of Ocean University of China

基　　金：国家自然科学基金联合基金项目(U1906233)资助。

摘　　要：针对内孤立波模拟中两层流体模型与实际海洋环境存在差异的问题,本文将物理海洋中内孤立波模拟的数值模式延展至海洋结构物载荷分析数值水槽中,提出了一种在密度连续变化数值水槽中对内孤立波的模拟方法。利用非静压平衡的麻省理工学院通用环流模式(MITgcm),构建密度层化模型及地形模型,在真实海洋环境作用下生成内孤立波,将Fluent软件构建的数值水槽入口置于MITgcm计算域内,提取对应位置处MITgcm计算结果作为数值水槽的密度分布形式和边界条件,使用用户自定义函数(UDF)将内孤立波引入数值水槽中。结果表明:内孤立波在数值水槽传播后与MITgcm在对应位置处的水平流速基本一致,等密度线在密度跃层处偏差小;模拟方法能更好地反映实际海洋环境下内孤立波的特征。A method for simulating internal solitary waves in a numerical tank with continuous changes in density is proposed.The simulation method extends the numerical model of internal solitary waves in the physical ocean to the numerical tank for load analysis of oceanic structures to restore the internal isolated wave in the actual ocean environment.Fluent numerical tank inlet boundary is placed in the MITgcm computing domain.The density stratification model and the terrain model are constructed using the non-hydrostatic MITgcm.Internal solitary waves are generated under real marine environmental action in MITgcm,and the calculation results at corresponding positions are extracted as the density distribution form and boundary conditions of the numerical tank by using UDF.The results show that the horizontal flow velocity is consistent,and the isodensity line deviation at the pycnocline is small in the internal solitary wave in the corresponding position of the numerical tank and MITgcm.The feasibility of internal solitary waves numerical water tank is verified by comparison,and the method can better reflect the characteristics of internal solitary waves in the actual ocean environment.

关 键 词：内孤立波 数值水槽 麻省理工学院通用环流模式 Fluent软件 密度连续变化 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]