Physical origin of vortex stretching and twisting: Viscous or inertial forces

doi:10.1063/5.0108594

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	Physical origin of vortex stretching and twisting: Viscous or inertial forces
	Lin LM(林黎明); Wu YX(吴应湘)
发表期刊	PHYSICS OF FLUIDS
	2022-09
卷号	34 期号:9 页码:93108
ISSN	1070-6631
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.
学科领域	Mechanics ; Physics, Fluids & Plasmas
DOI	10.1063/5.0108594
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000860322800002
论文分区	一类/力学重要期刊
力学所作者排名	1
RpAuthor	Lin, LM (corresponding author), Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China.
引用统计
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/90211
专题	流固耦合系统力学重点实验室
作者单位	1.[Lin, L. M. 2.Wu, Y. X.] Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China 3.[Wu, Y. X.] Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
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,2022,34,9,:93108.
APA	林黎明,&吴应湘.(2022).Physical origin of vortex stretching and twisting: Viscous or inertial forces.PHYSICS OF FLUIDS,34(9),93108.
MLA	林黎明,et al."Physical origin of vortex stretching and twisting: Viscous or inertial forces".PHYSICS OF FLUIDS 34.9(2022):93108.

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