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

doi:10.1063/5.0089126

	Contribution of flow topology to the kinetic energy flux in hypersonic turbulent boundary layer
	Xu, Dehao 1; Wang, Jianchun 2; Yu ZP(于长平)3 ; Li XL(李新亮)3 ; Chen, Shiyi 1,2
通讯作者	Wang, Jianchun(wangjc@sustech.edu.cn) ; Chen, Shiyi(chensy@sustech.edu.cn)
发表期刊	PHYSICS OF FLUIDS
	2022-04-01
卷号	34 期号:4 页码:23
ISSN	1070-6631
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.
DOI	10.1063/5.0089126
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000788720700024
关键词[WOS]	DIRECT NUMERICAL-SIMULATION ; VELOCITY-GRADIENT TENSOR ; FINE-SCALE MOTIONS ; REYNOLDS-NUMBER ; COMPRESSIBILITY ; DYNAMICS ; INVARIANTS ; STRAIN ; EVOLUTION ; SHEAR
WOS研究方向	Mechanics ; Physics
WOS类目	Mechanics ; Physics, Fluids & Plasmas
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
项目资助者	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
论文分区	一类/力学重要期刊
力学所作者排名	3
RpAuthor	Wang, Jianchun ; Chen, Shiyi
引用统计	被引频次：9[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/311007/89085
专题	高温气体动力学国家重点实验室
作者单位	1.Peking Univ, State Key Lab Turbulence & Complex Syst, Coll Engn, Beijing 100871, Peoples R China; 2.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Peoples R China; 3.Chinese Acad Sci, Inst Mech, Lab High Temp Gas Dynam, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Xu, Dehao,Wang, Jianchun,Yu ZP,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,于长平,李新亮,&Chen, Shiyi.(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.

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