Multiscale dynamics in streamwise-rotating channel turbulence

doi:10.1017/jfm.2023.691

CORC > 力学研究所 > 中国科学院力学研究所 > 高温气体动力学国家重点实验室

	Multiscale dynamics in streamwise-rotating channel turbulence
	Hu, Running 1,2; Li, Xinliang 1,2; Yu, Changping 2
刊名	JOURNAL OF FLUID MECHANICS
	2023-09-29
卷号	972 页码:28
关键词	rotating turbulence turbulence simulation
ISSN号	0022-1120
DOI	10.1017/jfm.2023.691
通讯作者	Yu, Changping(cpyu@imech.ac.cn)
英文摘要	In this paper the multiscale dynamics of streamwise-rotating channel turbulence is studied through direct numerical simulations. Using the generalized Kolmogorov equation, we find that as rotation becomes stronger, the turbulence in the buffer layer is obviously reduced by the intense spatial turbulent convection. On the contrary, in other layers, the turbulence is strengthened mainly by the modified production peak, the intense spatial turbulent convection and the suppressed forward energy cascades. It is also discovered that under a system rotation, small- and large-scale inclined structures have different angles with the streamwise direction, and the difference is strengthened with increasing rotation rates. The multiscale inclined structures are further confirmed quantitatively through a newly defined angle based on the velocity vector. Through the budget balance of Reynolds stresses and the hairpin vortex model, it is discovered that the Coriolis force and the pressure-velocity correlation are responsible for sustaining the inclined structures. The Coriolis force directly decreases the inclination angles but indirectly induces inclined structures in a more predominant way. The pressure-velocity correlation term is related to the strain rate tensor. Finally, the anisotropic generalized Kolmogorov equation is used to validate the above findings and reveals that the multiscale behaviours of the inclined structures are mainly induced by the mean spanwise velocity gradients.
资助项目	National Key Research and Development Program of China[2019YFA0405300] ; National Key Research and Development Program of China[2020YFA0711800] ; NSFC Projects[12072349] ; NSFC Projects[12232018] ; NSFC Projects[91852203] ; NSFC Projects[12202457]
WOS关键词	ENERGY ; FLOW ; SIMULATION ; VORTICES ; BUDGET
WOS研究方向	Mechanics ; Physics
语种	英语
WOS记录号	WOS:001081283000001
资助机构	National Key Research and Development Program of China ; NSFC Projects
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/93162]
专题	力学研究所_高温气体动力学国家重点实验室
通讯作者	Yu, Changping
作者单位	1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, LHD, Inst Mech, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Hu, Running,Li, Xinliang,Yu, Changping. Multiscale dynamics in streamwise-rotating channel turbulence[J]. JOURNAL OF FLUID MECHANICS,2023,972:28.
APA	Hu, Running,Li, Xinliang,&Yu, Changping.(2023).Multiscale dynamics in streamwise-rotating channel turbulence.JOURNAL OF FLUID MECHANICS,972,28.
MLA	Hu, Running,et al."Multiscale dynamics in streamwise-rotating channel turbulence".JOURNAL OF FLUID MECHANICS 972(2023):28.