Spanwise phase transition between pure modes A and B in a circular cylinder’s wake. Part II: spatiotemporal evolution of vorticity
文献类型：期刊论文
| 作者 | Lin,L M; Lin LM(林黎明)
|
| 刊名 | Fluid Dynamics Research
 |
| 出版日期 | 2023-10-01 |
| 卷号 | 55期号:5 |
| ISSN号 | 0169-5983 |
| 关键词 | spanwise phase transition wake circular cylinder mode A mode B |
| DOI | 10.1088/1873-7005/ad02ba |
| 通讯作者 | Lin,L M() |
| 英文摘要 | Abstract Through direct numerical simulation, the transition from pure mode A to mode B in the near wake of a circular cylinder is studied without consideration of vortex dislocations. The Reynolds number R e is calculated from 100 to 330 with a computational spanwise length of 4 diameters. In the present section, the spatiotemporal evolution of the vorticity and its sign are analyzed. The results show that mode B, as a kind of weak disturbed vorticity with opposite signs, actually appears partially on the rear surface of the cylinder and in the shear layers once Re exceeds 193. With increasing R e , the vortex-shedding patterns in the near wake undergo the initial generation stage of mode B coupling with the fully developed pure mode A ( 193 ? R e < 230 ), the mode swapping or coexistence stage between modes A and B ( 230 ? R e < 260 ～ 265 ), the self-adjustment stage of the nondimensional spanwise wavelength from 0.8 to 1 in dominant mode B ( 260 ～ 265 ? R e < 310 ), and the full development stage of mode B ( R e ? 310 ). In particular, the spanwise phase transition initially occurs at a certain spanwise position in the initial generation stage where a part of mode A and a part of mode B with specific vorticity signs appear, e.g. the Π ? vortex in mode A and the Π + vortex in mode B, in which Π ? and Π + vortices are vortices with three vorticity components satisfying the vorticity sign law and shed from the upper and lower shear layers, respectively. |
| 语种 | 英语 |
| WOS记录号 | IOP:FDR_55_5_055505 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/93309]  |
| 专题 | 力学研究所_流固耦合系统力学重点实验室(2012-) |
| 通讯作者 | Lin,L M |
| 作者单位 | Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Lin,L M,Lin LM. Spanwise phase transition between pure modes A and B in a circular cylinder’s wake. Part II: spatiotemporal evolution of vorticity[J]. Fluid Dynamics Research,2023,55(5). |
| APA | Lin,L M,&林黎明.(2023).Spanwise phase transition between pure modes A and B in a circular cylinder’s wake. Part II: spatiotemporal evolution of vorticity.Fluid Dynamics Research,55(5). |
| MLA | Lin,L M,et al."Spanwise phase transition between pure modes A and B in a circular cylinder’s wake. Part II: spatiotemporal evolution of vorticity".Fluid Dynamics Research 55.5(2023). |
入库方式： OAI收割
来源：力学研究所
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