Intrinsic relationship of vorticity between modes A and B in the wake of a bluff body | |
Lin LM(林黎明); Shi SY(史仕荧); Wu YX(吴应湘) | |
发表期刊 | Theoretical & Applied Mechanics Letters |
2018-08-31 | |
卷号 | 8期号:5页码:320-325 |
ISSN | 2095-0349 |
摘要 | The intrinsic physical relationship of vorticity between modes A and B in the three-dimensional wake transition is investigated. Direct numerical simulations for the flow past a square-section cylinder are carried out at Reynolds numbers of 180 and 250, associated with modes A and B, respectively. Based on the analysis of spacial distributions of vorticity in the near wake, characteristics of the vertical vorticity in modes A and B are identified. Moreover, the relationship of three vorticity components with specific signs is summarized into two sign laws, as intrinsic physical relationships between two instability modes. By the theory of vortex-induced vortex, such two sign laws confirm that there are two and only two kinds of vortex-shedding patterns in the near wake, just corresponding to modes A and B. In brief, along the free stream direction, mode A can be described by the parallel shedding vertical vortices with the same sign, while mode B is described by the parallel shedding streamwise vortices with the same sign. Finally, it is found out that the -type vortex is a basic kind of vortex structure in both modes A and B. |
关键词 | Mode a Mode b Wake Bluff Body Sign Law |
DOI | 10.1016/j.taml.2018.05.006 |
收录类别 | CSCD |
语种 | 英语 |
CSCD记录号 | CSCD:6379773 |
论文分区 | 二类 |
力学所作者排名 | 1 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/78189 |
专题 | 流固耦合系统力学重点实验室 |
通讯作者 | Shi SY(史仕荧) |
推荐引用方式 GB/T 7714 | Lin LM,Shi SY,Wu YX. Intrinsic relationship of vorticity between modes A and B in the wake of a bluff body[J]. Theoretical & Applied Mechanics Letters,2018,8,5,:320-325. |
APA | Lin LM,Shi SY,&Wu YX.(2018).Intrinsic relationship of vorticity between modes A and B in the wake of a bluff body.Theoretical & Applied Mechanics Letters,8(5),320-325. |
MLA | Lin LM,et al."Intrinsic relationship of vorticity between modes A and B in the wake of a bluff body".Theoretical & Applied Mechanics Letters 8.5(2018):320-325. |
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