内孤立波作用下柔性跨接管动力性能研究

Dynamic performance study of flexible jumper under internal solitary waves

活跃在中国南海的内孤立波已经成为该地区海洋油气资源开发中不得不考虑的因素。跨接管作为连接水下油气储存开采设施与海面油气处理设施的重要装置,由于具有较大柔性,由内孤立波引起的剪切海流将会对其产生巨大影响。采用KdV方程对内孤立波进行模拟,基于向量式有限元法,建立了柔性跨接管的动力学分析模型,对不同方向内孤立波作用下的跨接管的动力性能进行分析。分析结果表明在内孤立波作用下,跨接管存在一个明显的动力过程,能够导致跨接管产生较大的位置移动及其整体位置的抬升,同时跨接管对于内孤立波的入射角十分敏感,其内力可能发生突然变化。内孤立波的振幅对跨接管的极值响应有显著影响。

The internal solitary waves active in the South China Sea have become an important factor that must be considered in the development of marine oil and gas resources.As one of the important devices connecting underwater oil and gas storage and exploitation facilities with offshore oil and gas treatment facilities,the shear current caused by internal solitary waves will have a great impact on the flexible jumper because of its flexibility.However,there is a lack of in-depth research in this field.In this study,the internal solitary wave is simulated by using the KdV equation.Based on the vector form intrinsic finite element method,a dynamic analysis model of flexible jumper is established,and the dynamic performance of flexible jumper under different directions of internal solitary wave is analyzed.The analysis results show that the jumper under the action of internal solitary waves is a distinct dynamic process,which can lead to large displacement of the position of the jumper and the rise of its overall position.At the same time,the jumper is very sensitive to the incident angle of internal solitary wave,and its internal force may change abruptly.The amplitude of the internal solitary waves has a significant effect on the extreme response of the jumper.