Direct numerical simulations of a turbulent channel flow developing over convergent-divergent riblets | |
Guo TB(郭同彪)3; Fang, Jian2; Zhong, Shan1; Moulinec, Charles2 | |
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. |
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