Direct numerical simulations of a turbulent channel flow developing over convergent-divergent riblets

doi:10.1016/j.ijheatfluidflow.2022.109069

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

	Direct numerical simulations of a turbulent channel flow developing over convergent-divergent riblets
	Guo TB(郭同彪)3; Fang, Jian 2; Zhong, Shan 1; Moulinec, Charles 2
刊名	INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
	2022-12-01
卷号	98 页码:18
关键词	Convergent-divergent riblets Direct numerical simulation Large-scale secondary flow motion Turbulent kinetic energy budget
ISSN号	0142-727X
DOI	10.1016/j.ijheatfluidflow.2022.109069
通讯作者	Guo, Tongbiao(guotongbiao@imech.ac.cn)
英文摘要	Direct numerical simulations of a turbulent channel flow developing over convergent-divergent (C-D) riblets at a Reynolds number of Reb = 2800 are presented. It is found that, with a fixed normalized riblet height of h+ = 5, as the ratio of the riblet spacing and the height, s/h, increases from 2 to 10, the strength of the large-scale secondary flow motion Gamma generated by the C-D riblets peaks around s/h = 4 when the C-D riblets behavior lies between d- and k-type roughness. Compared to the baseline case with smooth walls, the turbulent activities and energy level increase significantly and peak at s/h = 4 when Gamma is the highest. It is shown that while the intense local turbulent kinetic energy (TKE) production occurring in the diverging region is caused by the high local velocity gradient due to the downwelling of the secondary flow, the strong local TKE production occurring in the converging region is caused by the high turbulent shear stress associated with upwelling. Furthermore, the TKE transport characteristics are significantly altered by the secondary flow motion, especially over the converging and diverging regions. The secondary flow is not caused by the local imbalance between turbulent kinetic energy production and dissipation but by the yawed riblets. It is then more appropriate to classify this flow as a Prandtl's secondary flow of the first kind, also known as the geometry-driven secondary flow. Finally, in comparison with the baseline case, the drag increases for all the riblet cases examined, and a direct correlation between the amount of drag and intensity of the secondary flow exists, both peaking at s/h = 4.
分类号	二类
资助项目	Newton Fund, UK[ST/R0067 33/1] ; UKRI Engineering and Physical Sciences Research Council (EPSRC) , UK through the Computational Science Centre for Research Communities ; UK Turbulence Consortium[EP/R029326/1]
WOS关键词	BOUNDARY-LAYER ; FRICTION
WOS研究方向	Thermodynamics ; Engineering ; Mechanics
语种	英语
WOS记录号	WOS:000879579100004
资助机构	Newton Fund, UK ; UKRI Engineering and Physical Sciences Research Council (EPSRC) , UK through the Computational Science Centre for Research Communities ; UK Turbulence Consortium
其他责任者	Guo, Tongbiao
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/90759]
专题	力学研究所_高温气体动力学国家重点实验室
作者单位	1.Univ Manchester, Dept Mech Aerosp & Civil Engn, Manchester M13 9PL, England 2.STFC Daresbury Lab, Warrington WA4 4AD, England; 3.Chinese Acad Sci, Inst Mech, LHD, Beijing 100190, Peoples R China;
推荐引用方式 GB/T 7714	Guo TB,Fang, Jian,Zhong, Shan,et al. Direct numerical simulations of a turbulent channel flow developing over convergent-divergent riblets[J]. INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW,2022,98:18.
APA	郭同彪,Fang, Jian,Zhong, Shan,&Moulinec, Charles.(2022).Direct numerical simulations of a turbulent channel flow developing over convergent-divergent riblets.INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW,98,18.
MLA	郭同彪,et al."Direct numerical simulations of a turbulent channel flow developing over convergent-divergent riblets".INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW 98(2022):18.