摘要
针对内孤立波在传播过程中导致海面海水剧烈辐聚和突发性强流,会对海上油气平台、输油管道等海洋结构物造成严重威胁的问题,本文基于高质量的实测数据,通过内波动力模态分解以及Morison方程,研究了内孤立波对小直径圆形桩柱的作用力,包括总作用力、作用力随时间的变化、作用力沿水深的分布以及作用力分量的大小。研究结果表明,桩柱所受的总作用力以第1模态为主导;波谷达到时,对桩柱的作用力会达到最大值,并且作用力的大小都呈现出为先增大后减小的变化趋势;上、下2层流体的拖曳力方向相反,惯性力的方向也是相反的,而在同一层流体中,拖曳力和惯性力的方向也是相反的;在内孤立波经过时,Morison方程计算得到的惯性力没有明显的变化趋势,惯性力相比于拖曳力,惯性力量值小,对总作用力的影响也很小,基本可以忽略不计。本文的研究内容为海洋油气钻井平台的设计提供了参考。
Severe convergence and sudden strong currents may occur during the propagation process,posing a serious threat to offshore oil and gas platforms,oil pipelines,and other offshore structures.Based on high-quality observational data,through the internal wave mode decomposition and Morison equation,the force of internal solitary waves on small-diameter circular piles is studied,including the total force,the variation of the force with time,the distribution of the force along the water depth and the magnitude of the force component.The research results show that the total force acting on the pile is dominated by the first mode;When the wave trough reaches,the acting force on the pile will reach the maximum value,and the magnitude of the acting force will increase first and then decrease;The direction of drag force and inertia force of the upper and lower layers of fluid are opposite,and the direction of drag force and inertia force are opposite in the same layer of fluid;When the internal solitary wave passes through,the inertia force calculated by Morison equation has no obvious change trend.Compared with the drag force,the inertia force has a small value and has little influence on the total force,which can be basically ignored.The results of this study provide a reference for the design of offshore oil and gas drilling platform.
作者
刘倩
曾丽娟
崔健
欧阳佚卓
高俊亮
张瑞瑞
LIU Qian;ZENG Lijuan;CUI Jian;OUYANG Yizhuo;GAO Junliang;ZHANG Ruirui(School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2023年第10期1772-1778,共7页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(42076005)
江苏省自然科学基金项目(BK20210885)
江苏省高等学校自然科学研究项目(20KJD17005).
关键词
内孤立波
内波
桩柱
作用力
Morison公式
时空演变
模态结构
南海
internal solitary wave
internal wave
pile
acting force
Morison formula
spatiotemporal evolution
modal structure
South China Sea
