FPSO内孤立波载荷特性数值研究  

Numerical study for load characteristics of internal solitary waves on the FPSO

作　　者：张瑞瑞[1,2,3] 张新曙 尤云祥[1,2] 吴海建[4] 刘建成 ZHANG Rui-rui;ZHANG Xin-shu;YOU Yun-xiang;WU Hai-jian;LIU Jian-chen(State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China;Jiangsu University of Science and Technology, Zhenjiang 212000, China;China Merchants Heavy Industry (Jiangsu) Co., Ltd, Haimen 226116, China)

机构地区：[1]上海交通大学海洋工程国家重点实验室,上海200240 [2]高新船舶与深海开发装备协同创新中心,上海200240 [3]江苏科技大学,江苏镇江212000 [4]招商局重工(江苏)有限公司,江苏海门226116

出　　处：《船舶力学》2019年第8期906-916,共11页Journal of Ship Mechanics

基　　金：国家自然科学基金资助项目（11372184）;国家重大基础研究计划973课题资助项目（2013CB036103）;江苏省海门市“东洲英才”创新团队基金

摘　　要：文章将KdV、eKdV和MCC内孤立波理论应用到内孤立波数值模拟水槽入口速度条件计算,讨论内孤立波与浮式生产储卸油装置FPSO强非线性作用问题。结果表明,数值模拟所得FPSO内孤立波水平载荷、垂向载荷及力矩与实验结果相吻合,内孤立波载荷主要由波浪压差力、粘性压差力和摩擦力构成,粘性压差力很小,可以忽略;在水平载荷中,摩擦力较压差力约小一个量级,流体粘性的影响不可忽略;在垂向载荷中,摩擦力比压差力小很多,在分析时可以忽略流体粘性的影响。由于FPSO始终处于上层流体中,对内孤立波的模拟波形和其诱导流场的影响很小。波浪压差力可利用傅汝德-克雷洛夫公式基于动压力进行计算,而水平载荷中的摩擦力则需根据内孤立波诱导速度的切向分量对FPSO吃水湿表面求积分的方法进行计算。A numerical flume is used to analyse the strong nonlinear interaction between the internal solitary wave and Floating Production Storage and Offloading(FPSO), where the velocity-inlet boundary is given with the depth-averaged velocities in two-layer fluids induced by the internal solitary waves based on KdV, eKdV and MCC theories. The numerical results of the horizontal, vertical forces and torque on the FPSO induced by internal solitary waves have good agreement with experimental results. The internal solitary wave forces on the FPSO can be divided into the wave pressure difference forces, the viscous pressure forces and the friction force, where the viscous pressure force is small and can be neglected. For the horizontal force, the friction force is smaller than the pressure forces with one order of magnitude, this means that the effect of the fluid viscosity can not be neglected. For the vertical force, the component of the friction force is a very small amount, thus the effect of the fluid viscosity can be neglected. Moreover, the effects of the FPSO on the waveform and flow field induced by internal solitary waves are small because FPSO is always in the upper layer. And it is feasible that the component of the wave pressure force on the FPSO by internal solitary waves is calculated using Froude-Krylov formulas based on the dynamic pressure, and the component of the friction force for the horizontal force is calculated by the integration of the tangential component based on the velocities induced by internal solitary waves by use of the wetted surface area of the FPSO.

关 键 词：两层流体 内孤立波 FPSO 摩擦阻力 傅汝德-克雷洛夫力 

分 类 号：O352[理学—流体力学]