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Wall-shear stress fluctuations in a supersonic turbulent boundary layer over an expansion corner

文献类型：期刊论文

作者Tong FL(童福林)2,3,4; Chen JQ2,3; Sun D2,3; Li XL(李新亮)1,4
刊名JOURNAL OF TURBULENCE
出版日期2020-07-23
页码20
关键词Wall-shear stress expansion corner supersonic turbulent boundary layer direct numerical simulation
ISSN号1468-5248
DOI10.1080/14685248.2020.1797058
英文摘要The effect of wall expansion on the structural and statistical characteristics of wall-shear stress (WSS) fluctuations was investigated by direct numerical simulations of a supersonic turbulent boundary layer over a sharp expansion corner with various deflection angles (beta = 0(0), 2(0), 5(0)and 10(0)). It is found that the two-dimensional fields of WSS are characterised as streamwise-elongated streaky structures being aligned in the spanwise direction, resembling low- and high-speed streaks in the buffer region of the flow. Due to the relaminarization effect, these WSS steaks experience a sudden weakening shortly after the expansion corner, but present gradual regrowth with their length scales even exceeding those of the flat-plate case in the far downstream. A strong streamwise-alignment of the instantaneous WSS vector is evident in the case of the largest deflection angle, suggesting a distinct reduction of the intermittency in the relaminarization process. Furthermore, the characteristic time scale of the spanwise component of WSS is quasi-invariant to the expansion effect, while the peak frequency of the streamwise component increases with the increase of the deflection angle.
分类号Q3
WOS关键词DIRECT NUMERICAL-SIMULATION ; PRESSURE ; RELAMINARIZATION ; FLOW
WOS研究方向Mechanics ; Physics
语种英语
WOS记录号WOS:000551328100001
资助机构NSFC[11972356] ; NSFC[91852203] ; Science Challenge Project[TZ2016001] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDC01000000] ; National Key Research and Development Program of China ; Natural Science Foundation of China ; Key Research and Development Programof China[2019YFA0405300] ; Key Research and Development Programof China[2016YFA0401200] ; National Numerical Windtunnel project
其他责任者Tong, Fulin
源URL[http://dspace.imech.ac.cn/handle/311007/84745]  
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 Chinese Acad Sci, Sch Engn Sci, Beijing, Peoples R China
2.China Aerodynam Res & Dev Ctr, Computat Aerodynam Inst, Mianyang 621000, Sichuan, Peoples R China;
3.China Aerodynam Res & Dev Ctr, State Key Lab Aerodynam, Mianyang 621000, Sichuan, Peoples R China;
4.Chinese Acad Sci, Inst Mech, LHD, Beijing 100190, Peoples R China;
推荐引用方式
GB/T 7714		 Tong FL,Chen JQ,Sun D,et al. Wall-shear stress fluctuations in a supersonic turbulent boundary layer over an expansion corner[J]. JOURNAL OF TURBULENCE,2020:20.
APA 童福林,Chen JQ,Sun D,&李新亮.(2020).Wall-shear stress fluctuations in a supersonic turbulent boundary layer over an expansion corner.JOURNAL OF TURBULENCE,20.
MLA 童福林,et al."Wall-shear stress fluctuations in a supersonic turbulent boundary layer over an expansion corner".JOURNAL OF TURBULENCE (2020):20.

入库方式： OAI收割

来源：力学研究所

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