双模块铰接式半潜平台波浪砰击数值分析

Numerical investigation on wave slamming of the double module articulated semi-submersible platform

双模块铰接式半潜平台是一种新型海上浮式平台,它由两个半潜平台模块通过铰接式连接器连接而成,可完全释放模块间的相对纵摇运动。连接器的存在使平台两个模块各自的运动与传统的单模块半潜平台运动有很大差别,并因此导致平台受波浪砰击的情形与单模块不同。本文基于势流理论和CFD技术,应用NS-VOF模型对双模块半潜平台的波浪砰击特征进行了研究。文中考虑了平台多体运动对波浪砰击载荷的影响,实现了平台运动与波浪场的叠加,仿真分析了平台的波浪砰击过程,并对砰击载荷进行了数值预报。数值结果显示,双模块铰接式平台的艏艉两端上翘现象显著,波浪砰击集中于平台跨中区域,甲板下缘监测点砰击载荷较大。本文计算结果可用于指导双模块平台连接器和局部结构的设计工作。

As a new type of floating platform consisting of two semi-submersible platforms,the double module articulated semi-submersible platform has independent pitch motions among 6DOFs,whose motion fea⁃tures and wave slamming with the connection of articulation are quite different from those of a traditional sin⁃gle-module platform.The potential theory is combined with CFD technology in this paper to investigate the wave slamming problem of double module platform.The slamming simulation superimposes the module mo⁃tion with the wave domain to take in the motion effects on wave slamming and reaches a numerical report of wave slamming process and slamming load.The numerical results show that the motion of the two ends of the platform is amplified unusually so that the wave slamming is focused on the middle part of the platform with an appreciable impact load.The results of numerical report can give some guidance on the design of platform articulation and lower deck.