均匀流中圆柱横向受迫振荡数值模拟(梁亮文; 万德成)

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【作者】梁亮文; 万德成 【作者单位】上海交通大学船舶海洋与建筑工程学院海洋工程国家重点实验室水利论文Y]#G"h9g o

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J2p,gzmP0【论文摘要】 本研究利用 Fluent 求解器求解二维 NS 方程,同时结合动网格技术模拟圆柱运动的边界,对雷诺数为200的均匀流中不同振荡频率及不同振荡幅值情况下圆柱做横向受迫振荡的绕流场进行数值模拟。首先我们对在固定振幅比 A=0.2情况下不同频率比对发生频率锁定现象的影响进行研究,得到了升阻力系数时间历程曲线中的"拍击"和"锁定"特性及尾迹中涡结构变化;随后我们对频率比 F=1情况下振幅对泻涡结构变化的影响进行了分析.通过改变振幅的大小,我们发现尾流中的泻涡从"2S"形式的卡门涡街到每个振荡周期泻放一个涡对和一个单涡的"P+S"形式的变化,同时还发现相关实验中观察到的圆柱升力和位移之间相位的变化.

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9g,~1P} uK1s0【英文论文摘要】 A two-dimensional numerical simulation of forced oscillation of a circular cylinder in cross-flow with Re=200 is presented in this paper.The FLUENT software with dynamic mesh technique is adopted for the solution of the problem.The simulation concentrates on a domain of oscillation frequencies fc near the natural shedding frequency fs of the fixed cylinder.Firstly,the simulation is performed with different values of frequency ratio F=fc/fs for a specified amplitude of A=0.2;then the influence of oscillating amplitude on the vortex shedding mode for a fixed frequency ratio F=1 is considered.As the amplitude is increased,the Karman vortex shedding mode(2S)evolving into an asymmetric shedding mode in which a pair and a single vortex(P+S)are shed in each motion cycle and the change of the phase of lift force with respect to cylinder motion are found.These results agree very well with those in many concerning experimental observations.水利论文k/xBz R M `#n

&k+A c } ~K&L?uBY0【论文关键词】 流固耦合; 动网格; 圆柱受迫振荡; 锁定
b0W uHQ0【英文论文关键词】 fluid-structure interaction; dynamic mesh; forced oscillating cylinder; lock in水利论文1uQ;Qd:FN
【基金】国家科技部863课题(No.2006AA09Z354,2006AA09A107);; 教育部博士点基金(No.20060248039)的资助,
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TAG: 数值模拟 万德成 圆柱 梁亮文 振荡
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