Sustaining mechanism of Taylor-Gortler-like vortices in a streamwise-rotating channel flow

doi:10.1103/PhysRevFluids.5.044601

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

	Sustaining mechanism of Taylor-Gortler-like vortices in a streamwise-rotating channel flow
	Yang ZX(杨子轩)1; Deng BQ 3,4; Wang BC 2; Shen L 3,4
刊名	PHYSICAL REVIEW FLUIDS
	2020-04-21
卷号	5 期号:4 页码:24
ISSN号	2469-990X
DOI	10.1103/PhysRevFluids.5.044601
通讯作者	Deng, Bing-Qing(bdeng@umn.edu)
英文摘要	Energy transport in the spectral space is analyzed to study the mechanism underlying the Taylor-Gortler-like (TGL) vortices that appear as two layers of streamwise-elongated roll cells in a turbulent channel flow subjected to fast streamwise system rotation. The transport equation of the velocity-spectrum tensor in a rotating frame is derived to study the budget balance of energy spectra at different length scales. Two new terms, namely, the rotation-induced redistribution term and rotation-induced wall-normal diffusion term, are defined to reflect the effect of the imposed system rotation on the energy transport process. By analyzing the data obtained from direct numerical simulation, it is discovered that four key processes are responsible for sustaining the motion of the TGL vortices. The first process corresponds to the energy production at the characteristic length scales of the TGL vortices that drains energy from the mean flow to the TGL vortices. The second process is the rotation-induced energy redistribution from the streamwise velocity fluctuations to the wall-normal and spanwise velocity fluctuations that form the vortex structures on a cross-stream plane. The third process is the energy diffusion from the near-wall region to the channel center, which is enhanced due to the occurrence of the TGL vortices and, in turn, feeds energy to the vortices. The last process is the inverse interscale energy transfer, through which the large-scale TGL vortices absorb energy from small-scale eddies.
分类号	二类
资助项目	NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics[11988102] ; Institute of Mechanics, Chinese Academy of Sciences ; Natural Sciences and Engineering Research Council (NSERC) of Canada
WOS关键词	REYNOLDS-STRESS ; SPANWISE ROTATION ; BOUNDARY-LAYER ; TURBULENT ; ENERGY ; INSTABILITIES ; SIMULATIONS ; COUETTE ; BUDGETS
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000527140000004
资助机构	NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics ; Institute of Mechanics, Chinese Academy of Sciences ; Natural Sciences and Engineering Research Council (NSERC) of Canada
其他责任者	Deng, Bing-Qing
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/81858]
专题	力学研究所_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 Manitoba, Dept Mech Engn, Winnipeg, MB R3T 5V6, Canada 3.Univ Minnesota, St Anthony Falls Lab, Minneapolis, MN 55455 USA; 4.Univ Minnesota, Dept Mech Engn, 111 Church St SE, Minneapolis, MN 55455 USA;
推荐引用方式 GB/T 7714	Yang ZX,Deng BQ,Wang BC,et al. Sustaining mechanism of Taylor-Gortler-like vortices in a streamwise-rotating channel flow[J]. PHYSICAL REVIEW FLUIDS,2020,5(4):24.
APA	杨子轩,Deng BQ,Wang BC,&Shen L.(2020).Sustaining mechanism of Taylor-Gortler-like vortices in a streamwise-rotating channel flow.PHYSICAL REVIEW FLUIDS,5(4),24.
MLA	杨子轩,et al."Sustaining mechanism of Taylor-Gortler-like vortices in a streamwise-rotating channel flow".PHYSICAL REVIEW FLUIDS 5.4(2020):24.