组合隔板抑制液舱晃荡机理的数值方法研究  

Numerical Investigation on the Mechanism of Combined Anti-Slosh Baffles

作　　者：罗鑫 董胜[1] LUO Xin;DONG Sheng(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）》2020年第10期107-117,共11页Periodical of Ocean University of China

基　　金：国家自然科学基金委员会-山东省人民政府联合基金项目(U1706226)资助。

摘　　要：液舱晃荡是船舶与海洋工程领域的热点问题,有效地抑制液舱晃荡、减小壁面冲击载荷关系着船体结构的安全。使用内嵌隔板是抑制舱内晃荡,减小壁面冲击载荷的有效手段。实际工程中,内嵌隔板的最优设计的前提是对隔板抑制晃荡的机理有深入了解。CIP法具有高精度、低耗散等特点,以THINC格式捕捉自由液面,可以再现液面破碎、翻卷、涡旋以及液滴飞溅等现象。基于此法,建立了数值液舱,对比了单一隔板和组合隔板抑制晃荡的效果。结果表明,内嵌隔板的安装在水平位置上应尽量靠近舱底中线,在垂直位置上应尽量靠近自由液面,且液面附近安装的双垂直隔板抑制晃荡能力最佳。Liquid sloshing inside a partically filled container may result in a violent impact on the walls of the tank expecially when the ship motion frequencies are close to the sloshing natural frequencies.The resonant sloshing motions can be suppressed by using inside baffles.The basic mechanism of the anti-slosh baffles is to obstruct the sloshing-induced flow,change the lowest natural frequency,and dissipate the sloshing energy by visconsity.Vortexes will be generated alongside the tips of baffles.This phenomenon is the main reason of energy dissipation.The optimized design of the baffles is particularly important since the total volume of inner baffles is limited because the project costs and the risk damage to the baffles may rise with the volume of baffles increasing.The mechanism of anti-slosh baffles should be recognized clearly in order to design inner devices effectively.The Constrained Inter polation Profile(CIP)method is utilized to establish a two-dimensional numerical simulations of sloshing in a rectangular tank.The Tangent Hyperbolic Interface Capture(THINC)scheme is employed on the free-surface capture.The tank is 0.6 m in length and 0.6 m in height.The depth of liquid is fixed in 0.2 m which in the region of the most dangerous interval.The frequency of external motivation is 6.33 rad/s which is the first-order natural frequency of the tank,the most intense sloshing motions will occur under this situation.In this way,liquid sloshing can be simulated precisely and a sharp free-surface is obtained.The breaking and rolling up of the liquid could be observed as well.To explore the basic working principle of anti-slosh baffles,the effect of single vertical baffle,dual vertical baffles,and generalized T-type baffles on the sloshing reduction inside a rectangular tank are investigated numerically.In the single baffle test,the result shows that a baffle which near the free-surface and the midline the tank may have a more excellent ability of sloshing suppression and this conclusion also applies in cases of mult

关 键 词：液舱晃荡 CIP法 内嵌隔板 抑制晃荡 数值模拟 二维矩形液舱 

分 类 号：O353[理学—流体力学]