IMECH-IR
Physical mechanism for origin of streamwise vortices in mode A of a square-section cylinder
Lin LM(林黎明)1; Shi SY(史仕荧)1; Wu YX(吴应湘)1,2
Corresponding AuthorShi, S. Y.(shishiying@imech.ac.cn)
Source PublicationACTA MECHANICA SINICA
2019-04-01
Volume35Issue:2Pages:411-418
ISSN0567-7718
AbstractIn the present paper, physical mechanism responsible for origin of streamwise vortices in mode A appeared in the three-dimensional (3-D) wake transition of a square-section cylinder is investigated. Direct numerical simulations at a Reynolds number of 180 firstly show that such streamwise vorticity is not originated from lateral surfaces. Then through the analysis of local flow field in the immediate neighborhood of rear surface, based on the theory of vortex-induced vortex, a new physical mechanism is identified. At first, the vertical vorticity on rear surface is generated by the intrinsic three-dimensional instability with the same instability wavelength of mode A. Then the streamwise vorticity at a specific sign is induced by such vertical vorticity, convected and concentrated in the shear layers. Finally, streamwise vortices are formed and shed with alternatively shedding spanwise vortices in the near wake. Moreover, the effect of induced spanwise vorticity on original two-dimensional (2-D) spanwise vorticity is also presented in detail.
KeywordMode A Streamwise vortices Wake Square cylinder Vortex-induced vortex
DOI10.1007/s10409-018-0818-4
URL查看原文
Indexed BySCI ; EI ; CSCD
Language英语
WOS IDWOS:000466180600016
WOS KeywordWAKE ; VORTEX ; TRANSITION ; FLOW
WOS Research AreaEngineering ; Mechanics
WOS SubjectEngineering, Mechanical ; Mechanics
Funding ProjectStrategic Priority Research Program of Chinese Academy of Science[XDB22030101]
Funding OrganizationStrategic Priority Research Program of Chinese Academy of Science
Classification二类
Ranking1
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/79177
Collection中国科学院力学研究所
流固耦合系统力学重点实验室
Affiliation1.Chinese Acad Sci, Key Lab Mech Fluid Solid Coupling Syst, Inst Mech, Beijing 100190, Peoples R China;
2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Lin LM,Shi SY,Wu YX. Physical mechanism for origin of streamwise vortices in mode A of a square-section cylinder[J]. ACTA MECHANICA SINICA,2019,35(2):411-418.
APA 林黎明,史仕荧,&吴应湘.(2019).Physical mechanism for origin of streamwise vortices in mode A of a square-section cylinder.ACTA MECHANICA SINICA,35(2),411-418.
MLA 林黎明,et al."Physical mechanism for origin of streamwise vortices in mode A of a square-section cylinder".ACTA MECHANICA SINICA 35.2(2019):411-418.
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