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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
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
DOI10.1016/j.taml.2018.05.006
收录类别CSCD
语种英语
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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