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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)
2018-04-01
发表期刊ACTA MECHANICA SINICA
卷号34期号:2页码:238-256
ISSN0567-7718
摘要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.
关键词Vortex shedding pattern Fluid forces Flow control Conical shroud Perforation
DOI10.1007/s10409-017-0707-2
URL查看原文
收录类别SCI ; EI
语种英语
WOS记录号WOS:000428923700002
关键词[WOS]SQUARE-SECTION CYLINDER ; LOW REYNOLDS-NUMBERS ; INDUCED VIBRATION ; CIRCULAR-CYLINDERS ; DRAG REDUCTION ; SUPPRESSION ; WAKE ; SIMULATION ; DYNAMICS ; WALL
WOS研究方向Engineering, Mechanical ; Mechanics
WOS类目Engineering ; Mechanics
项目资助者National Key Scientific Instrument and Equipment Development Program of China [2011YQ120048]
论文分区二类
力学所作者排名1
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被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/77808
专题流固耦合系统力学重点实验室
作者单位1.[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
推荐引用方式
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 林黎明,钟兴福,&吴应湘.(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 林黎明,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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