畸形波作用下JIP Spar平台波浪力分析  

Hydrodynamic characteristics research of freak waves interaction with JIP Spar

作　　者：刘珍[1] 茅润泽 马小剑[1] 嵇春艳[1] 李晨鹏 

机构地区：[1]江苏科技大学船舶与海洋工程学院,江苏镇江212003

出　　处：《海洋工程》2015年第4期19-27,44,共10页The Ocean Engineering

基　　金：国家自然科学基金青年基金(51209107;51309124);国家自然科学基金面上项目(51179077)

摘　　要：利用时域高阶边界元法研究畸形波、系泊系统与浮式结构物耦合作用问题,运用四阶Runge-Kutta方法更新下一时间步的波面和速度势,采用非线性有限元法模拟系泊缆索的各种受力及缆索的弹性变形。以Longuet Hinggins模型为基础,调整组成波的初相位,在很短的波列中得到满足畸形波定义的波形。分析了聚焦位置、初始相位、谱峰周期、谱宽以及水流参数等对系泊JIP Spar平台缆绳力和波浪荷载的影响。将入射波浪的聚焦点分别设置在平台的迎浪侧和背浪侧,分析缆绳力和波浪荷载聚焦峰值,模拟结果发现其最大值产生在聚焦点为迎浪侧的情况。当聚焦点在迎浪侧时,缆绳力和波浪荷载聚焦峰值随着初相位的增加而减小,随着谱宽的增加而减小,而随着谱峰周期的增加而增加。A time domain higher-order boundary element method（ THOBEM） is introduced to solve the problem of the freak wave-mooring lines-body interaction. The 4thRunge-kutta method is applied to update the potential and wave run-up at the next step.The finite element method is used to simulate the distortion and tension of the mooring system. Based on the Longuet Hinggins model,we obtain waves which satisfy the definition of freak waves in a short period by modulating the initial phase. The influences of focusing positions,initial phase,peak spectral periods,spectral widths and Foluolide number are analyzed to obtain the hydrodynamic characteristics of the cable force and wave force on JIP Spar. When the focusing points of incident wave are set at the back side and head side of the platform respectively,the maximal peak values of the cable force and wave force are present at the head side by the analysis of simulation results. When the focusing positions are set at the head side,the peak value decreases along with initial phase and spectral widths,and increases along with the peak spectral periods.

关 键 词：畸形波 JIP SPAR平台 系泊系统 时域高阶边界元法 波浪力 聚焦点 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]