Vortex motion in the early stages of unsteady flow around a circular cylinder
文献类型：期刊论文
| 作者 | Ling GC(凌国灿) ; Yin XY
|
| 刊名 | Sadhana-Academy Proceedings in Engineering Sciences
 |
| 出版日期 | 1984 |
| 卷号 | 7期号:7页码:119-135 |
| 关键词 | vortex motion - unsteady flow - circular cylinder - flow structure - boundary layer separation - rear shear layer separation - viscous vortex core |
| ISSN号 | 0256-2499 |
| 中文摘要 | In this paper, processes in the early stages of vortex motion and the development of flow structure behind an impulsively-started circular cylinder at high Reynolds number are investigated by combining the discrete vortex model with boundary layer theory, considering the separation of incoming flow boundary layer and rear shear layer in the recirculating flow region. The development of flow structure and vortex motion, particularly the formation and development of secondary vortex and a pair of secondary vortices and their effect on the flow field are calculated. The results clearly show that the flow structure and vortices motion went through a series of complicated processes before the symmetric main vortices change into asymmetric: development of main vortices induces secondary vortices; growth of the secondary vortices causes the main vortex sheets to break off and causes the symmetric main vortices to become “free” vortices, while a pair of secondary vortices is formed; then the vortex sheets, after breaking off, gradually extend downstream and the structure of a pair of secondary vortices becomes relaxed. These features of vortex motion look very much like the observed features in some available flow field visualizations. The action of the secondary vortices causes the main vortex sheets to break off and converts the main vortices into free vortices. This should be the immediate cause leading to the instability of the motion of the symmetric main vortices. The flow field structure such as the separation position of boundary layer and rear shear layer, the unsteady pressure distributions and the drag coefficient are calculated. Comparison with other results or experiments is also made. |
| 类目[WOS] | Engineering, Multidisciplinary |
| 研究领域[WOS] | Engineering |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:A1984TR72100002 |
| 公开日期 | 2009-08-03 ; 2010-08-20 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/39848]  |
| 专题 | 力学研究所_力学所知识产出(1956-2008) |
| 推荐引用方式 GB/T 7714 | Ling GC,Yin XY. Vortex motion in the early stages of unsteady flow around a circular cylinder[J]. Sadhana-Academy Proceedings in Engineering Sciences,1984,7(7):119-135. |
| APA | 凌国灿,&Yin XY.(1984).Vortex motion in the early stages of unsteady flow around a circular cylinder.Sadhana-Academy Proceedings in Engineering Sciences,7(7),119-135. |
| MLA | 凌国灿,et al."Vortex motion in the early stages of unsteady flow around a circular cylinder".Sadhana-Academy Proceedings in Engineering Sciences 7.7(1984):119-135. |
入库方式： OAI收割
来源：力学研究所
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