Numerical and experimental study of the interaction between a vortex dipole and a circular cylinder
Numerical and experimental study of the interaction between a vortex dipole and a circular cylinder
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DOI：
10.1007/bf00230259
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发表时间：
1995
影响因子：
2.4
通讯作者：
R. Verzicco;J-B Jan-Bert Flór;V. Heijst;Paolo Orlandi
中科院分区：
文献类型：
--
作者：
R. Verzicco;J-B Jan-Bert Flór;V. Heijst;Paolo Orlandi
本文描述了偶极涡旋和实心圆柱体之间的中心碰撞的研究。通过使用染料可视化和条纹摄影对流动进行实验分析。将涡度场和被动示踪剂的传输等流动特性与数值模拟进行了比较。观察表明，在圆柱壁上产生的薄层涡旋是由初级偶极子半部平流传播的，在卷起成致密斑块的同时，形成了两个新的不对称偶极子，它们沿着弯曲的轨迹移动。研究了碰撞前后偶极子内部涡度分布的结构。数值和实验结果均表明，源自原始初级偶极子的涡度斑块大致保留了其原始函数关系ω=f(ψ)，而次级涡度斑块则表现出组织成具有相似关系的结构的趋势。
This paper describes a study of the centred collision between a dipolar vortex and a solid circular cylinder. The flow was analysed experimentally by using dye visualizations and streak photography. Flow characteristics such as vorticity fields and the transport of passive tracers were compared with numerical simulations. Observations revealed that thin layers of vorticity, created at the cylinder wall are advected by the primary dipole halves, which, while rolling up into compact patches, give rise to the formation of two new asymmetric dipoles that move away along curved trajectories. The structure of the vorticity distribution inside the dipole, before and after the collision, has been investigated. Both the numerical and the experimental results indicate that the vorticity patches originating from the original primary dipole approximately preserve their original functional relationshipω=f(ψ), while the secondary vorticity patches show a tendency to organize into structures attaining a similar relationship.