水平激励下钻井船矩形月池的水动力特性研究  

Hydrodynamic Characteristics of Rectangular Moonpool of Drilling Unit Under Horizontal Excitation

作　　者：黄磊[1] 刘利琴[1] 唐友刚[1] 张永恒[1] 郭东杰[2] 

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072 [2]天津海事局,天津300211

出　　处：《天津大学学报（自然科学与工程技术版）》2015年第11期1001-1008,共8页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(51179125)

摘　　要：研究了具有矩形月池的钻井船在小幅水平横荡简谐运动激励下的辐射问题.利用简化的底部边界条件,基于线性势流理论建立了钻井船月池二维流体运动方程,利用Galerkin方法求得月池内流体速度势,得到月池对船舶的附加质量表达式.利用半解析解,研究了月池的水动力特性及月池参数对船舶水动力参数的影响.以边界元方法建立具有矩形月池结构的钻井船数值模型,数值模拟结果与半解析解进行对比验证.结果表明,在激励频率穿过月池内流体的固有振动频率时,附加质量会依次出现正、负峰值;自由液面及月池底部无量纲速度分布受激励频率及月池无量纲水深的影响较明显;在不同无量纲水深下,半解析解与数值模拟结果吻合较好.A study was carried out on radiation problem of a drilling unit with a rectangular moonpool under low amplitude horizontal harmonic excitation. The two-dimensional governing equations of the fluid in the moonpool were established based on linear potential theory. The simplified boundary condition was adopted. The fluid velocity potential and the added mass expression of the moonpool was solved by the Galerkin method. The hydrodynamic characteristics of the moonpool were studied and the effect of the moonpool parameters on the drilling unit was revealed. A numerical model of a drilling unit with a rectangular moonpool was built by boundary element method. The results of two methods were compared to verify the semi-analytical solution. The results show that the added mass presents positive and negative peaks when the excitation frequency passes through the natural frequency of the moonpool; the free surface shape and nondimensional velocity distribution are significantly affected by the excitation frequency and the non-dimensional draught of moonpool; the semi-analytical solution fits the numerical result well for different nondimensional draughts of moonpool.

关 键 词：月池 半解析解 附加质量 线性势流理论 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]