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

doi:10.1080/14685248.2020.1797058

	Wall-shear stress fluctuations in a supersonic turbulent boundary layer over an expansion corner
	Tong FL(童福林)1,2,3; Chen JQ 2,3; Sun D 2,3; Li XL(李新亮)1,4
发表期刊	JOURNAL OF TURBULENCE
	2020-07-23
页码	20
ISSN	1468-5248
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.
关键词	Wall-shear stress expansion corner supersonic turbulent boundary layer direct numerical simulation
DOI	10.1080/14685248.2020.1797058
收录类别	SCI
语种	英语
WOS记录号	WOS:000551328100001
关键词[WOS]	DIRECT NUMERICAL-SIMULATION ; PRESSURE ; RELAMINARIZATION ; FLOW
WOS研究方向	Mechanics ; Physics
WOS类目	Mechanics ; Physics, Fluids & Plasmas
项目资助者	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
论文分区	Q3
力学所作者排名	1
RpAuthor	Tong, Fulin
引用统计	被引频次：5[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/311007/84745
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.China Aerodynam Res & Dev Ctr, State Key Lab Aerodynam, Mianyang 621000, Sichuan, Peoples R China; 3.China Aerodynam Res & Dev Ctr, Computat Aerodynam Inst, Mianyang 621000, Sichuan, Peoples R China; 4.Univ Chinese Acad Sci, Sch Engn Sci, Beijing, 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.

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