为减轻涡激运动对系泊结构的疲劳破坏,提出一种波纹柱体结构,探讨其涡激运动特性及抑制机理。结构与流体的非线性耦合作用通过用户自定义函数（UDF）和动网格技术实现,运动微分方程采用四阶龙格-库塔法求解。研究发现,波纹柱体与裸圆柱结构的涡激运动特性明显不同。裸圆柱随折合速度的增加呈明显的锁定特性,而波纹柱体结构的涡激响应特性与波纹高度Hw/D相关。当波纹高度Hw/D=0.01和0.05时亦会发生锁定现象,但锁定区间较裸圆柱小,当波纹高度Hw/D=0.02~0.04时结构不再发生锁定问题。结果表明,波纹结构对柱体的涡激运动有明显抑制作用。
Abstract
In order to mitigate the fatigue damage of the riser and mooring system by vortex-induced motion（VIM）, in the present work, a numerical simulation for the characteristics of VIM and suppression mechanism of a new wavy cylindrical structure is proposed. The nonlinear coupling interaction between the structure and fluid is performed by user-defined function （UDF） and dynamic mesh techniques,and the differential equations of motion are solved by the fourth-order Runge-Kutta methods. It was found that the VIM characteristics of the wavy cylinders and cylinder were significantly different. The cylinder shows a significant lock-in characteristic with the increasing reduced velocity,while the response characteristic of the wavy cylinders are related to the wave height Hw/D. The lock-in phenomenon also occurs when the wave height is Hw/D=0.01 and 0.05,but the lock-in region is smaller than that of circular cylinder,and the lock-in problem is no longer occurs when the wavy height is Hw/D=0.02-0.04. The results show that the wavy cylinders have a significant suppression effect on the VIM.
关键词
海上浮式风力机 /
流固耦合 /
干扰抑制 /
龙格-库塔法 /
波纹柱体
Key words
offshore wind turbines /
fluid structure interaction /
interference suppression /
Runge Kutta method /
wavy cylinders
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基金
省属高校基本科研业务费（2021J006）; GK新苗人才计划（24127000107）; 舟山市科技计划（2019C21022）
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