Physical origin of vortex stretching and twisting: Viscous or inertial forces
文献类型：期刊论文
| 作者 | Lin LM(林黎明) ; Wu YX(吴应湘)
|
| 刊名 | PHYSICS OF FLUIDS
 ; 9
|
| 出版日期 | 2022-09 |
| 卷号 | 34页码:93108 |
| ISSN号 | 1070-6631 |
| DOI | 10.1063/5.0108594 |
| 英文摘要 | In this paper, the physical origin of vortex stretching and twisting is theoretically investigated. The effects of inertial and viscous forces are mainly considered and discussed. Two key conditions, i.e., solid walls and three-dimensional (3D) disturbances, are adopted in three typical cases. Among them, the first two cases are straight and curved vortex lines at the initial time without any kind of disturbance. The third case is a straight vortex line at the initial time with introduced 3D natural disturbances. Through experimental observations, numerical simulations, and theoretical analysis in these cases, the first two cases illustrate that the straight or curved vortex lines are still straight or curved at the next time, respectively, regardless of whether solid walls are introduced. However, the third case clearly shows that once natural disturbances are introduced, the straight vortex lines near and at solid walls at the initial time are stretched and twisted mainly by viscous forces, instead of inertial forces, typically demonstrated by the 3D wake transition of a straight circular cylinder and the transition of the laminar boundary layer at a flat plate. Accordingly, based on definitions of generation and enhancement in vortex stretching and twisting, it is confirmed that the viscous forces with two key conditions are the generation mechanism, while the inertial forces alone are the enhancement mechanism. |
| 学科主题 | Mechanics ; Physics, Fluids & Plasmas |
| 分类号 | 一类/力学重要期刊 |
| 语种 | 英语 |
| WOS记录号 | WOS:000860322800002 |
| 其他责任者 | Lin, LM (corresponding author), Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China. |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/90211]  |
| 专题 | 力学研究所_流固耦合系统力学重点实验室(2012-) |
| 作者单位 | 1.[Wu, Y. X.] Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Wu, Y. X.] Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China 3.[Lin, L. M. |
| 推荐引用方式 GB/T 7714 | Lin LM,Wu YX. Physical origin of vortex stretching and twisting: Viscous or inertial forces[J]. PHYSICS OF FLUIDS, 9,2022,34:93108. |
| APA | 林黎明,&吴应湘.(2022).Physical origin of vortex stretching and twisting: Viscous or inertial forces.PHYSICS OF FLUIDS,34,93108. |
| MLA | 林黎明,et al."Physical origin of vortex stretching and twisting: Viscous or inertial forces".PHYSICS OF FLUIDS 34(2022):93108. |
入库方式： OAI收割
来源：力学研究所
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