| Wall-shear stress fluctuations in a supersonic turbulent boundary layer over an expansion corner | |
Tong FL(童福林)1,2,3; Chen JQ2,3; Sun D2,3; Li XL(李新亮)1,4
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| Source Publication | JOURNAL OF TURBULENCE
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| 2020-07-23 | |
| Pages | 20 |
| ISSN | 1468-5248 |
| Abstract | 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. |
| Keyword | Wall-shear stress expansion corner supersonic turbulent boundary layer direct numerical simulation |
| DOI | 10.1080/14685248.2020.1797058 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000551328100001 |
| WOS Keyword | DIRECT NUMERICAL-SIMULATION ; PRESSURE ; RELAMINARIZATION ; FLOW |
| WOS Research Area | Mechanics ; Physics |
| WOS Subject | Mechanics ; Physics, Fluids & Plasmas |
| Funding Organization | 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 |
| Classification | Q3 |
| Ranking | 1 |
| Contributor | Tong, Fulin |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/84745 |
| Collection | 高温气体动力学国家重点实验室 |
| Affiliation | 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 |
| Recommended Citation 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.Rp_Au:Tong, Fulin |
| 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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| Jp2020189.pdf（5228KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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