内孤立波作用下FPSO载荷数值分析

Numerical Analysis of the Load on FPSO under the Action of Internal Solitary

针对内孤立波对固定海域中工作浮式生产储油卸油装置(floating production storage and offloading,FPSO)造成的危害,运用数值模拟方法分析FPSO受到内孤立波载荷情况。首先,构建与实验水槽尺寸一致的数值水槽,将FPSO沿吃水方向划分为不同分层的数值模型,研究在不同分层模型的内孤立波波形生成情况;然后,分析不同分层模型模拟的FPSO所受到的内孤立波载荷情况;最后,分析了FPSO周围流场情况。研究结果表明:利用五层模型所模拟的内孤立波与eKdV理论解一致性较好;利用五层网格模型和七层网格模型所获得的FPSO内孤立波载荷与实验结果更接近。综合计算结果一致度和计算成本考虑,认为五层网格数值模型更适用之后的载荷成分分解及理论预报模型研究。

In response to the harm caused by internal solitary waves to floating production storage and offloading(FPSO)operating in fixed sea areas,numerical simulation methods are used to analyze the loading of FPSO under internal solitary waves.Firstly,a numerical water tank with the same size as the experimental water tank is constructed,and the FPSO is divided into different layered numerical models along the draft direction to study the generation of internal solitary wave waveforms in different layered models;Then,the internal solitary wave loads on FPSOs simulated by different layered models are analyzed,and finally,the flow field around FPSO is analyzed.The research results indicate that the internal solitary waves simulated using the five-layer model have good consistency with the eKdV theoretical solution;The solitary wave loads inside the FPSO obtained using the five-layer grid model and seven-layer grid model are closer to the experimental results.Considering the consistency of the comprehensive calculation results and the computational cost,it is believed that the five-layer grid numerical model is more suitable for the subsequent load component decomposition and theoretical prediction model research.