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 D(徐多)1,2 ; Song BF 3
通讯作者	Song, Baofang(baofang_song@tju.edu.cn)
发表期刊	JOURNAL OF FLUID MECHANICS
	2022-10-26
卷号	950 页码:13
ISSN	0022-1120
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.
关键词	transition to turbulence intermittency shear-flow instability
DOI	10.1017/jfm.2022.839
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000874315400001
关键词[WOS]	PIPE
WOS研究方向	Mechanics ; Physics
WOS类目	Mechanics ; Physics, Fluids & Plasmas
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]
项目资助者	National Natural Science Foundation of China ; Tianjin University
论文分区	一类/力学重要期刊
力学所作者排名	1
RpAuthor	Song, Baofang
引用统计
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/90640
专题	非线性力学国家重点实验室
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 D,Song BF. Size-dependent transient nature of localized turbulence in transitional channel flow[J]. JOURNAL OF FLUID MECHANICS,2022,950:13.
APA	徐多,&Song BF.(2022).Size-dependent transient nature of localized turbulence in transitional channel flow.JOURNAL OF FLUID MECHANICS,950,13.
MLA	徐多,et al."Size-dependent transient nature of localized turbulence in transitional channel flow".JOURNAL OF FLUID MECHANICS 950(2022):13.

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