针对具有圆形截面的结构物易引发涡激运动这一问题，应用CFD方法模拟不同折合速度条件下带有运动抑制装置的圆筒型FPSO的涡激运动响应。分析结果发现，在折合速度为5～6时，圆筒型FPSO的涡激运动频率与纵荡、横荡运动的固有频率相近，出现了显著的涡激锁定现象，运动响应增大；当折合速度超过锁定区范围后，涡激运动响应幅值会有明显的减小，且横向的运动响应谱存在2个频率响应。对比不同流速下浮体在横向及顺流向的运动结果发现，带有运动抑制装置的圆筒型FPSO涡激运动的轨迹为类“8”字型。
Aiming at the problem that the structure with circular cross section is easy to cause vortex-induced motion, CFD method is used to simulate the vortex-induced motion response of cylindrical FPSO with motion suppression device under different reduced velocity conditions. The analysis results show that when the reduced velocity Ur =5 ~ 6, the vortex-induced motion frequency of the cylindrical FPSO is close to the natural frequency of surge and sway motion, and there is a significant vortex-induced locking phenomenon, and the motion response increases. When the reduced velocity exceeds the lock-in range, the amplitude of the vortex-induced motion response will be significantly reduced, and there are two frequency responses in the motion response spectrum perpendicular to the flow direction. Comparing the motion results of the floating body in the direction perpendicular to the flow direction and the downstream direction at different flow velocities, it is found that the trajectory of the vortex-induced motion of the cylindrical FPSO with the motion suppression device is a ' 8 ' shaped.
2024,46(24): 109-114 收稿日期：2023-7-17
DOI：10.3404/j.issn.1672-7649.2024.24.019
分类号：U661
基金项目：国家自然科学基金资助项目（52001230）；天津市自然科学基金资助项目（21JCQNJC00330）；工信部高技术船舶项目（CJ08N20）
作者简介：张若瑜(1981-),女,博士,副教授,研究方向为船舶与海洋工程
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