Propagation speed of turbulent fronts in pipe flow at high Reynolds numbers

doi:10.1017/jfm.2021.1160

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Propagation speed of turbulent fronts in pipe flow at high Reynolds numbers
	Chen,Kaiwen 1; Xu D(徐多)2,3; Song,Baofang 1
刊名	JOURNAL OF FLUID MECHANICS
	2022-01-25
卷号	935 页码:A11
关键词	shear-flow instability transition to turbulence pipe flow
ISSN号	0022-1120
DOI	10.1017/jfm.2021.1160
通讯作者	Song, Baofang(baofang_song@tju.edu.cn)
英文摘要	We investigated the propagation of turbulent fronts in pipe flow at high Reynolds numbers by direct numerical simulation. We used a technique combining a moving frame of reference and an artificial damping to isolate the fronts in short periodic pipes, which enabled us to explore the bulk Reynolds number up to Re = 10(5) with affordable computation power. We measured the propagation speed of the downstream front and observed that a fit of 1.971 - (Re/1925)(-0.825) (in unit of bulk speed) captures this speed above Re similar or equal to 5000 very well. The speed increases monotonically as Re increases, in stark contrast to the decreasing trend above Re similar or equal to 10 000 reported by Wygnanski & Champagne (J. FluidMech., vol. 59, 1973, pp. 281-335). The speed of the upstream front overall agrees with the former studies and 0.024 + (Re/1936)(-0.528) fits our data well, and those from the literature. Based on our analysis of the front dynamics, we proposed that both front speeds would keep their respective monotonic trends as the Reynolds number increases further. We show that, at high Reynolds numbers, the local transition at the upstream front tip is via high-azimuthal-wavenumber structures in the high-shear region near the pipe wall, whereas at the downstream front tip is via low-azimuthal-wavenumber structures in the low-shear region near the pipe centre. This difference is possibly responsible for the asymmetric speed scalings between the upstream and downstream fronts.
分类号	一类/力学重要期刊
资助项目	National Natural Science Foundation of China[91852105] ; National Natural Science Foundation of China[91752113] ; Tianjin University[2018XRX-0027] ; NSFC Basic Science Center Program for 'Multiscale Problems in Nonlinear Mechanics'[11988102]
WOS关键词	DIRECT NUMERICAL-SIMULATION ; TRANSITION ; VELOCITY ; SLUGS ; PUFFS
WOS研究方向	Mechanics ; Physics
语种	英语
WOS记录号	WOS:000865735200001
资助机构	National Natural Science Foundation of China ; Tianjin University ; NSFC Basic Science Center Program for 'Multiscale Problems in Nonlinear Mechanics'
其他责任者	Song, Baofang
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/90406]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.Tianjin Univ, Ctr Appl Math, Tianjin 300072, Peoples R China; 2.Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China; 3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Chen,Kaiwen,Xu D,Song,Baofang. Propagation speed of turbulent fronts in pipe flow at high Reynolds numbers[J]. JOURNAL OF FLUID MECHANICS,2022,935:A11.
APA	Chen,Kaiwen,徐多,&Song,Baofang.(2022).Propagation speed of turbulent fronts in pipe flow at high Reynolds numbers.JOURNAL OF FLUID MECHANICS,935,A11.
MLA	Chen,Kaiwen,et al."Propagation speed of turbulent fronts in pipe flow at high Reynolds numbers".JOURNAL OF FLUID MECHANICS 935(2022):A11.