Size-dependent transient nature of localized turbulence in transitional channel flow

doi:10.1017/jfm.2022.839

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	Size-dependent transient nature of localized turbulence in transitional channel flow
	Xu, Duo 1,2; Song, Baofang 3
刊名	JOURNAL OF FLUID MECHANICS
	2022-10-26
卷号	950 页码:13
关键词	transition to turbulence intermittency shear-flow instability
ISSN号	0022-1120
DOI	10.1017/jfm.2022.839
通讯作者	Song, Baofang(baofang_song@tju.edu.cn)
英文摘要	It has been reported that a fully localized turbulent band in channel flow becomes sustained when the Reynolds number is above a threshold. Here we show evidence that turbulent bands are of a transient nature instead. When the band length is controlled to be fixed, the lifetime of turbulent bands appears to be stochastic and exponentially distributed, a sign of a memoryless transient nature. Besides increasing with the Reynolds number, the mean lifetime also strongly increases with the band length. Given that the band length always changes over time in real channel flow, this size dependence may translate into a time dependence, which needs to be taken into account when clarifying the relationship between channel flow transition and the directed percolation universality class.
资助项目	National Natural Science Foundation of China[11988102] ; National Natural Science Foundation of China[91852105] ; National Natural Science Foundation of China[91752113] ; National Natural Science Foundation of China[92152106] ; Tianjin University[2018XRX-0027]
WOS关键词	PIPE
WOS研究方向	Mechanics ; Physics
语种	英语
WOS记录号	WOS:000874315400001
资助机构	National Natural Science Foundation of China ; Tianjin University
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/90639]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	Song, Baofang
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 3.Tianjin Univ, Ctr Appl Math, Tianjin 300072, Peoples R China
推荐引用方式 GB/T 7714	Xu, Duo,Song, Baofang. Size-dependent transient nature of localized turbulence in transitional channel flow[J]. JOURNAL OF FLUID MECHANICS,2022,950:13.
APA	Xu, Duo,&Song, Baofang.(2022).Size-dependent transient nature of localized turbulence in transitional channel flow.JOURNAL OF FLUID MECHANICS,950,13.
MLA	Xu, Duo,et al."Size-dependent transient nature of localized turbulence in transitional channel flow".JOURNAL OF FLUID MECHANICS 950(2022):13.