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Mechanism of wavy vortex and sign laws in flow past a bluff body: vortex-induced vortex
Lin LM(林黎明); Shi SY(史仕荧); Zhong XF(钟兴福); Wu YX(吴应湘)

As reported in a previous work by Lin et al. (Acta Mech Sin, 2018. 10.1007/s10409-018-0758-z In the present paper, the theory of a vortex-induced vortex is introduced to explore mechanisms in a wavy vortex and applicable sign laws for uniform and incompressible flow past a fixed bluff body. Based on the analysis of the nearest-wall flow, two vortex-induced models for streamwise and vertical vortex pairs, respectively, are proposed under two boundary cases, denoting the induced vorticity introduced or distributed on and near the walls. As a result, the first sign law, for only streamwise and vertical components of vorticity, and the second sign law, for three components of vorticity, are obtained under their own particular conditions. The first sign law reveals the intrinsic physical relationship between streamwise and vertical vorticities, independent of the distribution of spanwise vortices in the whole flow field. It is also confirmed that the spanwise vortices, as well as the shear layers and wake width, distributed wavily across the span, are attributed to the introduced streamwise or vertical vortices. The two sign laws for vorticity are independent of the disturbed spanwise wavelength and the Reynolds number. Through the analysis of flow past the conic shroud, the two sign laws are successfully used to summarize typical spacial distributions of vorticity in three flow regions: on and near the front cylinder surfaces, the separated shear layers and the near wake.

KeywordWavy vortex Sign law Vortex-induced vortex Wake Bluff body
Indexed BySCI ; EI ; CSCD
WOS IDWOS:000457970100001
WOS Research AreaEngineering, Mechanical ; Mechanics
WOS SubjectEngineering ; Mechanics
Funding OrganizationNational Key Scientific Instrument and Equipment Development Program of China [2011YQ120048] ; Strategic Priority Research Program of the Chinese Academy of Science [XDB22030101]
ContributorShi, SY
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Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorShi SY(史仕荧)
Affiliation1.{Lin, LM、Shi, SY、Zhong, XF、Wu, YX} Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China
2.{Wu, YX} Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Lin LM,Shi SY,Zhong XF,et al. Mechanism of wavy vortex and sign laws in flow past a bluff body: vortex-induced vortex[J]. ACTA MECHANICA SINICA,2019,35(1):1-14.
APA Lin LM,Shi SY,Zhong XF,&Wu YX.(2019).Mechanism of wavy vortex and sign laws in flow past a bluff body: vortex-induced vortex.ACTA MECHANICA SINICA,35(1),1-14.
MLA Lin LM,et al."Mechanism of wavy vortex and sign laws in flow past a bluff body: vortex-induced vortex".ACTA MECHANICA SINICA 35.1(2019):1-14.
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