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剪切流场中含内流立管横向涡激振动特性
CROSS-FLOW VORTEX-INDUCED VIBRATION OF A FLEXIBLE RISER WITH INTERNAL FLOW IN SHEAR CURRENT

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段金龙 1   周济福 1,2   王旭 1   陈科 3  
文摘 立管是海洋工程中输送油气或其他矿产资源的必备结构,外部洋流引起的立管涡激振动影响着立管的疲劳寿命,危害深海资源开发.本文基于欧拉-伯努利梁方程,结合半经验时域水动力模型,建立剪切流与内流耦合作用下海洋立管涡激振动预报模型,运用有限元方法和Newmark-β逐步积分法求解方程,首先将数值模拟结果与实验数据进行对比,验证模型正确性.然后,运用此模型,对剪切流作用下含内流的顶张立管在不同内流速度和密度下的横向涡激振动响应特性进行研究,主要分析了立管的横向振动模态、振动频率以及均方根位移等涡激振动参数随内流速度和密度等参数的变化规律.结果表明,在剪切流场中,含内流海洋立管在横向上表现出多模态多频率的涡激振动;立管横向振动的最大均方根位移随内流速度和密度的增大而增大,特别是当内流速度较大时,横向最大均方根位移增大明显;立管横向振动的主导频率随内流速度和密度的增大而减小,并且内流密度的增大同样会引起模态转换和频率转换.
其他语种文摘 As an important component transporting resources such as oil and mineral ores mixture from the seabed to the surface in ocean engineering, vortex-induced vibration(VIV)of flexible risers can be encountered when the risers are subjected to the external environmental conditions.As VIV can lead to structural fatigue for the riser system, which threatens to the facility safety during deepsea resource exploitation, it is of great significance to investigate VIV mechanism and dynamics.Therefore, VIV dynamics of a flexible fluid-conveying riser undergoing external shear current is studied based on the combination of the Euler-Bernoulli beam theory and the semi-empirical hydrodynamic model.The finite element method and Newmark-β method are adopted to discretize and solve the governing equation.The model is firstly validated by comparing with the experimental data in order to examine the accuracy of the present model.Subsequently, cross-flow(CF)VIV response of the fluid-conveying riser is mainly examined and analyzed while various internal flow velocity and fluid density are considered and changed.The results show that when the flexible riser is subjected to both internal flow and shear current, there appears multi-frequency response for CF VIV.And the CF vibrating frequency and the CF root mean square(RMS)displacement are evidently influenced by the internal flow velocity and fluid density.With the increase of the internal flow velocity and fluid density, the CF vibrating frequency decreases while the RMS displacement shows an increasing trend in CF direction.Furthermore, in addition to the variation of the CF vibrating frequency and RMS displacement, the change of internal flow densities can cause notable mode and frequency transitions.
来源 力学学报 ,2021,53(7):1876-1884 【核心库】
DOI 10.6052/0459-1879-21-171
关键词 横向涡激振动 ; 内流 ; 剪切流 ; 半经验水动力模型
地址

1. 中国科学院力学研究所, 中国科学院流固耦合系统力学重点实验室, 北京, 100190  

2. 中国科学院大学工程科学学院, 北京, 100049  

3. 上海交通大学, 海洋工程国家重点实验室, 上海, 200240

语种 中文
文献类型 研究性论文
ISSN 0459-1879
学科 石油、天然气工业
基金 国家自然科学基金 ;  中国科学院战略性先导科技专项
文献收藏号 CSCD:7027431

参考文献 共 38 共2页

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引证文献 6 篇

1 周力 亚临界雷诺数下单圆柱涡激振动研究 中国舰船研究,2022,17(3):145-152
CSCD被引 0 次

2 金国庆 深海采矿系统中悬臂式立管涡激振动分析 力学学报,2022,54(6):1741-1754
CSCD被引 3 次

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