圆柱单自由度涡激振动的大涡模拟研究  

LES Investigation on the 1dof Viv Response of a Circular Cylinder

作　　者：顾光祺 屈书恒 赖旭[1] 赵志高 GU Guang-qi;QU Shu-heng;LAI Xu;ZHAO Zhi-gao(State Key Laboratory of Water Resources Engineering and Management,Wuhan University,Wuhan 430072,Hubei Province,China)

机构地区：[1]武汉大学水资源工程与调度全国重点实验室,湖北武汉430072

出　　处：《中国农村水利水电》2025年第3期212-219,共8页China Rural Water and Hydropower

基　　金：国家自然科学基金(52209114);中国博士后创新人才支持计划(BX20220243);中国博士后科学基金(2021M702527)。

摘　　要：采用大涡模拟(LES method)和四阶龙格库塔耦合(fourth-order Runge-Kutta method)的双向流固耦合方法,在雷诺数范围为2×10^(3)~1.4×10^(4)的条件下对圆柱的单自由度涡激振动进行了数值模拟。数值模拟结果预测的振幅比、频率比以及尾流涡结构均与实验结果吻合的较好,准确的再现了圆柱单自由度涡激振动的3个响应分支,即初始分支、上端分支和下端分支。在此基础上,从圆柱振动与涡旋演变相互作用的角度,对圆柱单自由度涡激振动的3个响应分支的响应机理进行了详细的讨论。结果发现,在初始分支,圆柱振动对涡旋演变的影响非常小,主要是涡旋演变对圆柱振动的作用。在上端分支,圆柱的振动与涡旋演变间存在剧烈的相互作用。进入下端分支后,圆柱的振动与涡旋的演变之间的相互作用变弱,但仍存在一定的强度。In this paper,a bidirectional fluid-structure coupling method based on the Large Eddy Simulation(LES)and the fourth-order Runge-Kutta method is used to numerically simulate the one degree-of-freedom(1DOF)VIV of a circular cylinder under the Reynolds number range of 2×10^(3)~1.4×10^(4).The simulation results including vibration amplitude ratio,frequency ratio,and wake vortex structure are all in good agreement with the experiment results,and the characteristics of three response branches(the initial branch,upper branch,and lower branch)in the 1DOF VIV of a circular cylinder are accurately reproduced.On this basis,further research on the interaction between cylinder vibration and vortex evolution is conducted to explore the response mechanism of the three response branches in 1DOF VIV.The results show that in the initial branch,there is mainly the effect of vortex evolution on cylinder vibration,while the cylinder vibration has little effect on the vortex evolution.In the upper branch,there exists a fierce interaction between cylinder vibration and vortex evolution.After entering the lower branch,the interaction becomes weaker,but still has a certain intensity.

关 键 词：大涡模拟 涡激振动 流固耦合 单自由度 海流能 

分 类 号：O325[理学—一般力学与力学基础]