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

doi:10.1016/j.ijheatfluidflow.2022.109069

	Direct numerical simulations of a turbulent channel flow developing over convergent-divergent riblets
	Guo TB(郭同彪)1; Fang, Jian 2; Zhong, Shan 3; Moulinec, Charles 2
通讯作者	Guo, Tongbiao([email protected])
发表期刊	INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
	2022-12-01
卷号	98 页码:18
ISSN	0142-727X
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.
关键词	Convergent-divergent riblets Direct numerical simulation Large-scale secondary flow motion Turbulent kinetic energy budget
DOI	10.1016/j.ijheatfluidflow.2022.109069
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000879579100004
关键词[WOS]	BOUNDARY-LAYER ; FRICTION
WOS研究方向	Thermodynamics ; Engineering ; Mechanics
WOS类目	Thermodynamics ; Engineering, Mechanical ; Mechanics
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]
项目资助者	Newton Fund, UK ; UKRI Engineering and Physical Sciences Research Council (EPSRC) , UK through the Computational Science Centre for Research Communities ; UK Turbulence Consortium
论文分区	二类
力学所作者排名	1
RpAuthor	Guo, Tongbiao
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/90760
专题	高温气体动力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, LHD, Beijing 100190, Peoples R China; 2.STFC Daresbury Lab, Warrington WA4 4AD, England; 3.Univ Manchester, Dept Mech Aerosp & Civil Engn, Manchester M13 9PL, England
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.Rp_Au:Guo, Tongbiao
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.

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