IMECH-IR  > 流固耦合系统力学重点实验室
Effect of perforation on flow past a conic cylinder at Re=100: vortex-shedding pattern and force history
Lin LM(林黎明); Zhong XF(钟兴福); Wu YX(吴应湘)
Source PublicationACTA MECHANICA SINICA
2018-04-01
Volume34Issue:2Pages:238-256
ISSN0567-7718
Abstract

The flow past a circular-section cylinder with a conic shroud perforated with four holes at the peak was simulated numerically at , considering two factors, viz. the angle of attack and the diameter of the holes. The effects of the perforated conic shroud on the vortex shedding pattern in the near wake was mainly investigated, as well as the time history of the drag and lift forces. In the investigated parameter space, three flow regimes were generally identified, corresponding to weak, moderate, and strong disturbance effects. In regime I, the wake can mainly be described by alternately shedding Karman or Karman-like vortices. In regime II, the spanwise vortices are obviously disturbed along the span due to the appearance of additional vorticity components and their interactions with the spanwise vortices, but still shed in synchronization along the spanwise direction. In regime III, the typical Karman vortices partially or totally disappear, and some new vortex shedding patterns appear, such as -type, obliquely shedding, and crossed spanwise vortices with opposite sign. Corresponding to these complex vortex shedding patterns in the near wake, the fluid forces no longer oscillate regularly at a single vortex shedding frequency, but rather with a lower modulation frequency and multiple amplitudes. An overview of these flow regimes is presented.

KeywordVortex shedding pattern Fluid forces Flow control Conical shroud Perforation
DOI10.1007/s10409-017-0707-2
URL查看原文
Indexed BySCI ; EI ; CSCD
Language英语
WOS IDWOS:000428923700002
WOS KeywordSQUARE-SECTION CYLINDER ; LOW REYNOLDS-NUMBERS ; INDUCED VIBRATION ; CIRCULAR-CYLINDERS ; DRAG REDUCTION ; SUPPRESSION ; WAKE ; SIMULATION ; DYNAMICS ; WALL
WOS Research AreaEngineering, Mechanical ; Mechanics
WOS SubjectEngineering ; Mechanics
Funding OrganizationNational Key Scientific Instrument and Equipment Development Program of China [2011YQ120048]
CSCD IDCSCD:6248910
Classification二类
Ranking1
Citation statistics
Cited Times:1[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/77808
Collection流固耦合系统力学重点实验室
Affiliation1.[Lin, L. M.
2.Zhong, X. F.
3.Wu, Y. X.] Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Lin LM,Zhong XF,Wu YX. Effect of perforation on flow past a conic cylinder at Re=100: vortex-shedding pattern and force history[J]. ACTA MECHANICA SINICA,2018,34(2):238-256.
APA Lin LM,Zhong XF,&Wu YX.(2018).Effect of perforation on flow past a conic cylinder at Re=100: vortex-shedding pattern and force history.ACTA MECHANICA SINICA,34(2),238-256.
MLA Lin LM,et al."Effect of perforation on flow past a conic cylinder at Re=100: vortex-shedding pattern and force history".ACTA MECHANICA SINICA 34.2(2018):238-256.
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