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Contribution of flow topology to the kinetic energy flux in hypersonic turbulent boundary layer

文献类型：期刊论文

作者Xu, Dehao3; Wang, Jianchun2; Yu, Changping1; Li, Xinliang1; Chen, Shiyi2,3; Li XL(李新亮); Yu ZP(于长平)
刊名PHYSICS OF FLUIDS
出版日期2022-04-01
卷号34期号:4页码:23
ISSN号1070-6631
DOI10.1063/5.0089126
通讯作者Wang, Jianchun(wangjc@sustech.edu.cn) ; Chen, Shiyi(chensy@sustech.edu.cn)
英文摘要The contribution of various flow topologies to the subgrid-scale (SGS) flux of kinetic energy in hypersonic turbulent boundary layer for different Mach numbers and wall temperature ratios is investigated by direct numerical simulation. In the far-wall region (approximately y(+) = y/delta(nu) > 50, where y is the wall-normal location and delta(nu) is the viscous length scale), the volume fractions of flow topologies unstable focus/compressing (UFC) and stable focus/stretching (SFS) increase with the increase in filter width, resulting in the dominance of UFC and SFS in the inertial range; while in the near-wall region, the volume fractions of flow topologies unstable/saddle/saddle (UN/S/S), stable node/ saddle/saddle (SN/S/S), stable focus/compressing (SFC), and unstable focus/stretching (UFS) increase with the increase in filter width, leading to the majority of UN/S/S and SN/S/S in the inertial range. In the inertial range, the SGS flux of kinetic energy is mainly contributed by UFC and SFS far from the wall (approximately y(+) > 50) and is primarily contributed by UN/S/S and SN/S/S near the wall. The wall temperature has a significant effect on the contributions of various flow topologies in the near-wall region. As the wall temperature decreases, the contributions by SN/S/S and SFC to the SGS kinetic energy flux increase in the compression region, and those by UN/S/S and UFS increase in the expansion region. Moreover, the direct transfer of fluctuating kinetic energy from large scales to small scales is mainly characterized by UN/S/S, SFS, and SFC in the compression region, while the reverse transfer of fluctuating kinetic energy is primarily characterized by UFC, SN/S/S, and UFS in the expansion region.
WOS关键词DIRECT NUMERICAL-SIMULATION ; VELOCITY-GRADIENT TENSOR ; FINE-SCALE MOTIONS ; REYNOLDS-NUMBER ; COMPRESSIBILITY ; DYNAMICS ; INVARIANTS ; STRAIN ; EVOLUTION ; SHEAR
资助项目NSFC Basic Science Center Program[11988102] ; National Natural Science Foundation of China (NSFC)[91952104] ; National Natural Science Foundation of China (NSFC)[92052301] ; National Natural Science Foundation of China (NSFC)[12172161] ; National Natural Science Foundation of China (NSFC)[91752201] ; Technology and Innovation Commission of Shenzhen Municipality[KQTD20180411143441009] ; Technology and Innovation Commission of Shenzhen Municipality[JCYJ20170412151759222] ; Department of Science and Technology of Guangdong Province[2019B21203001] ; Center for Computational Science and Engineering of Southern University of Science and Technology
WOS研究方向Mechanics ; Physics
语种英语
WOS记录号WOS:000788720700024
资助机构NSFC Basic Science Center Program ; National Natural Science Foundation of China (NSFC) ; Technology and Innovation Commission of Shenzhen Municipality ; Department of Science and Technology of Guangdong Province ; Center for Computational Science and Engineering of Southern University of Science and Technology
源URL[http://dspace.imech.ac.cn/handle/311007/89084]  
专题力学研究所_高温气体动力学国家重点实验室
通讯作者Wang, Jianchun; Chen, Shiyi
作者单位1.Chinese Acad Sci, Inst Mech, Lab High Temp Gas Dynam, Beijing 100190, Peoples R China
2.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Peoples R China
3.Peking Univ, State Key Lab Turbulence & Complex Syst, Coll Engn, Beijing 100871, Peoples R China
推荐引用方式
GB/T 7714		 Xu, Dehao,Wang, Jianchun,Yu, Changping,et al. Contribution of flow topology to the kinetic energy flux in hypersonic turbulent boundary layer[J]. PHYSICS OF FLUIDS,2022,34(4):23.
APA Xu, Dehao.,Wang, Jianchun.,Yu, Changping.,Li, Xinliang.,Chen, Shiyi.,...&于长平.(2022).Contribution of flow topology to the kinetic energy flux in hypersonic turbulent boundary layer.PHYSICS OF FLUIDS,34(4),23.
MLA Xu, Dehao,et al."Contribution of flow topology to the kinetic energy flux in hypersonic turbulent boundary layer".PHYSICS OF FLUIDS 34.4(2022):23.

入库方式： OAI收割

来源：力学研究所

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