A general model for riblets simulation in turbulent flows

被引：14
作者：
Zhang, Ziliang [1 ,2 ,3 ]
Zhang, Mingming [1 ,2 ,3 ,4 ]
Cai, Chang [1 ,2 ,4 ]
Kang, Kai [1 ,2 ]
机构：
[1] Chinese Acad Sci, Inst Engn Thermophys, Beijing, Peoples R China
[2] Chinese Acad Sci, Key Lab Wind Energy Utilizat, Beijing, Peoples R China
[3] Univ Chinese Acad Sci, Beijing, Peoples R China
[4] Chinese Acad Sci, Dalian Natl Lab Clean Energy, Dalian, Peoples R China
来源：
INTERNATIONAL JOURNAL OF COMPUTATIONAL FLUID DYNAMICS | 2020年 / 34卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Riblet; drag reduction; turbulent boundary layer; slip-boundary condition; modelling strategy; DIRECT NUMERICAL-SIMULATION; FRICTION DRAG REDUCTION; BOUNDARY-LAYER; SKIN-FRICTION; SLIP LENGTH; SURFACES; MECHANISM;
D O I：
10.1080/10618562.2020.1761546
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
The shark-skin-inspired riblets could effectively reduce the turbulence wall-skin friction compared with the smooth surface. Nevertheless, computations of the flow field over riblets in the practical configurations (e.g., airplanes and wind turbines) remain unfeasible for its huge computational cost. In this study, a general strategy for modelling the effects of riblets in turbulent flows is proposed. Riblets are modelled by adopting a slip-boundary condition on the smooth wall. A quantitative relationship between the riblet geometric parameters and the slip length is theoretically built for the first time. This modelling method could greatly reduce grid numbers in the validating procedure by using Large-Eddy Simulation, and the modelling results indicate that the flow fields in logarithmic and wake regions over riblets could be accurately reproduced. Additionally, considering the slip-boundary model is not capable of reproducing the near-wall flow, a simplified calculating method is developed.
引用
收藏
页码：333 / 345
页数：13
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