大幅激励下液舱晃荡特性研究  

Research on liquid tank sloshing characteristics under large-amplitude excitation

作　　者：龚宸 邹昶方 傅振航 GONG Chen;ZOU Changfang;FU Zhenhang(School of Ocean Engineering,Jiangsu Ocean University,Lianyungang 222003,China)

机构地区：[1]江苏海洋大学海洋工程学院,江苏连云港222003

出　　处：《舰船科学技术》2024年第20期43-49,共7页Ship Science and Technology

基　　金：江苏省海洋资源开发研究院开放基金项目(JSIMR202009)。

摘　　要：晃荡载荷是大型液货船结构设计中的关键问题之一。本文基于数值模拟方法研究液舱在大幅激励下的晃荡特性问题,考虑的因素包括装载率、大幅横荡激励、大幅横荡-垂荡激励。采用基于有限体积法的CFD代码Fluent求解器,通过动网格技术驱动液舱运动并用VOF法追踪自由液面的非线性运动过程。研究结果表明,在大幅激励下,液体一阶固有频率偏离理论值;随着激励幅值的增大,晃荡压力呈线性增加到非线性增加,最终达到饱和的变化特性;对比受大幅横荡-垂荡耦合激励的液舱和受大幅横荡激励的液舱,其压力特性在低装载下相似,而中、高装载下,受大幅横荡-垂荡激励的液舱晃荡压力更高。Sloshing load is one of the key problems in the structural design of large liquid cargo ships.In this paper,the sloshing characteristics of liquid tanks under large amplitude excitation are studied based on numerical simulation method.The factors considered include loading rate,large amplitude sway excitation and large amplitude sway heave excitation.In this paper,the CFD code Fluent solver based on the finite volume method is used to drive the tank motion through the dy-namic grid technology,and the VOF method is used to track the nonlinear motion process of the free surface.The results show that the first natural frequency of liquid deviates from the theoretical value under large amplitude excitation;With the increase of excitation amplitude,the sloshing pressure increases linearly to nonlinearly,and finally reaches saturation;Com-pared with the tank excited by large sway heave coupling,the pressure characteristics of the tank excited by large sway are similar under low loading,while the sloshing pressure of the tank excited by large sway heave is higher under medium and high loading.

关 键 词：冲击压力 大幅度横荡激励 大幅度横荡-垂荡耦合激励 共振频率 

分 类 号：U663.85[交通运输工程—船舶及航道工程]