带附加分隔板细长柔性立管涡激振动的数值模拟  

Numerical simulation of vortex-induced vibration of a flexible riser with attached splitter plate

作　　者：李敏[1] 邓迪 万德成[1,2] LI Min;DENG Di;WAN De-cheng(Computational Marine Hydrodynamics Lab(CMHL),School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Ocean College,Zhejiang University,Zhoushan 316021,China)

机构地区：[1]上海交通大学船海计算水动力学研究中心(CMHL)船舶海洋与建筑工程学院,上海200240 [2]浙江大学海洋学院,舟山316021

出　　处：《水动力学研究与进展（A辑）》2021年第1期112-120,共9页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金(51806058)。

摘　　要：海洋立管等非流线型结构物在恒定来流的持续作用下容易发生涡激振动(VIV),这会加速结构物的疲劳损伤,因此抑振措施的研究引起学者们的广泛关注。分隔板是一种有效抑制立管涡激振动的方法,学者们对其抑制机理和规律开展了大量研究工作。该文基于海洋立管求解器viv-FOAM-SJTU,并采用切片法模拟了Re=4000时均匀流来流条件下的光滑立管和附加不同长度分隔板立管的涡激振动,主要对比分析了不同工况下立管的频率响应、位移响应和脱涡模式等动力响应特性的变化规律。发现附加一定长度范围内的分隔板可对立管的涡激振动起到一定程度的抑制作用,且抑制效果与分隔板的长度密切相关,当分隔板长度与立管直径之比(L/D)增大到0.5时,立管振幅反而增大。Under the continuous effect of current, Vortex-induced vibration(VIV) of non-streamlined structures such as marine risers may occur, which will accelerate the fatigue damage of the structure. Therefore, the study of vibration suppression measures has attracted wide attention from scholars. Splitter plate is an effective method to suppress the VIV of riser, and its inhibition mechanism and law have been studied by many scholars. Based on viv-FOAM-SJTU independently developed on OpenFOAM, a bared riser and a riser system attached with splitter plate of different lengths were numerically simulated respectively under Re=4 000. Characteristics of the vibration frequency, displacement response and vortex shedding mode with additional splitter plates for the different L/D ratios were analyzed. The numerical simulation results show that the additional splitter plate is able to suppress the VIV phenomenon effectively. There is a significant difference in the VIV suppression effect of the riser with the splitter plate of different lengths. Especially, when the length L/D=0.5, VIV of the riser will be amplified on the contrary.

关 键 词：涡激振动抑制 分隔板 柔性立管 viv-FOAM-SJTU求解器 

分 类 号：O359.1[理学—流体力学]