Indirect physical mechanism of viscous forces: Vortex stretching and twisting

doi:10.1063/5.0095838

CORC > 力学研究所 > 中国科学院力学研究所 > 流固耦合系统力学重点实验室(2012-)

	Indirect physical mechanism of viscous forces: Vortex stretching and twisting
	Lin, L. M.1,2; Wu, Y. X.1,2
刊名	PHYSICS OF FLUIDS
	2022-07-01
卷号	34 期号:7 页码:6
ISSN号	1070-6631
DOI	10.1063/5.0095838
通讯作者	Lin, L. M.(llmbirthday@163.com)
英文摘要	In this paper, the indirect physical mechanism of viscous forces, i.e., vortex stretching and twisting, is theoretically explored. The local flow in the immediate neighborhood of a flat plate is analyzed. Only the viscous forces are considered. By introducing oppositely signed streamwise vorticity in such a region, the induced velocity and vorticity fields are obtained. Because the induced streamwise velocity varies along with both the wall-normal and spanwise directions, induced vertical and spanwise vorticities are generated. The induction sequence is first clarified. Then, two indirect effects of viscous forces are identified. The induced spanwise vorticity leads to the original two-dimensional spanwise vorticity increasing and decreasing alternately across the span, as the vortex stretching effect of viscous forces. The local spanwise vortex is distorted at positions where the streamwise vorticity is introduced, and the appearance of induced vertical vorticity at the same positions enhances this effect, as the vortex twisting effect of viscous forces. Published under an exclusive license by AIP Publishing.
WOS关键词	BOUNDARY-LAYER ; GENERATION ; TRANSITION ; CYLINDER
WOS研究方向	Mechanics ; Physics
语种	英语
WOS记录号	WOS:000886020000007
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/91062]
专题	力学研究所_流固耦合系统力学重点实验室(2012-)
通讯作者	Lin, L. M.
作者单位	1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.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, L. M.,Wu, Y. X.. Indirect physical mechanism of viscous forces: Vortex stretching and twisting[J]. PHYSICS OF FLUIDS,2022,34(7):6.
APA	Lin, L. M.,&Wu, Y. X..(2022).Indirect physical mechanism of viscous forces: Vortex stretching and twisting.PHYSICS OF FLUIDS,34(7),6.
MLA	Lin, L. M.,et al."Indirect physical mechanism of viscous forces: Vortex stretching and twisting".PHYSICS OF FLUIDS 34.7(2022):6.