三维船体横摇运动数值模拟及舭龙骨阻尼特性研究  

Numerical Simulation of Ship Roll and Bilge Keel Damping Calculation

作　　者：蒋银 朱仁传[1,2] 缪国平 范菊 JIANG Yin;ZHU Ren-chuan;MIAO Guo-ping;FAN Ju(The State Key Laboratory of Ocean Engineering,School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200040,China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration,Shanghai 200040,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,海洋工程国家重点试验室,上海200040 [2]高新船舶与深海开发装备协同创新中心,上海200040

出　　处：《船舶力学》2020年第6期706-719,共14页Journal of Ship Mechanics

基　　金：国家自然科学基金资助项目(51479117,51579147);973项目(2014CB046203)。

摘　　要：为研究舭龙骨阻尼特性及尺寸航速等因素的影响,本文基于计算流体动力学方法分别对有、无舭龙骨三维船体的自由横摇衰减运动以及强迫横摇运动进行数值模拟研究,有无舭龙骨的三维船体的横摇阻尼之差即为舭龙骨阻尼。对Fr=0.138、初始横摇角10°带舭龙骨船体的自由横摇衰减数值模拟算例作了验证与确认分析,自由横摇衰减时历曲线与实验结果吻合较好,固有周期和横摇阻尼精度较高。进一步分析研究了不同几何尺寸、初始横摇角、航速以及频率等参数对舭龙骨阻尼的影响。自由横摇衰减模拟研究中舭龙骨阻尼随着舭龙骨宽度、初始横摇角度的增大而增大;当航速为0时,舭龙骨阻尼在总阻尼占比最大,航速对舭龙骨阻尼绝对值影响较小。强迫横摇模拟研究表明:当横摇角一定,舭龙骨阻尼随着频率的增大而非线性增大,在固有频率附近,粘性效应不可忽略。In order to obtain the bilge keel damping,numerical simulations of the free roll decay of DT⁃MB 5512 with/without bilge keels have been carried out based on computational fluid dynamics.The case(θ0=10°,Fr=0.138)is chosen for Verification and Validation(V&V),and the numerical results of time history of roll show a good agreement with the available experimental data,both natural period and roll damping of the ship are well evaluated.Furthermore,the influences of different bilge keel widths,speeds,initial roll angles on bilge keel damping are investigated respectively.The influence of frequency on bilge keel damping is estimated by numerical simulations of forced roll as well.Charac⁃teristics of bilge keel damping are summarized as follows:(1)the bilge keel damping increases with the bilge keel width,and it is sensitive to initial angle;(2)the bilge keel damping contributes to the highest proportion of total roll damping at Fr=0,and nonlinear relationship exists between bilge keel damping and roll frequencies;(3)the viscosity effect on the bilge keel damping cannot be ignored at the frequencies near nature frequency of ship roll.

关 键 词：自由横摇衰减 强迫横摇 舭龙骨阻尼 粘性效应 

分 类 号：U661.32[交通运输工程—船舶及航道工程]