Investigations on the turbulent/non-turbulent interface in supersonic compressible plate turbulent boundary layer

doi:10.1017/jfm.2024.439

	Investigations on the turbulent/non-turbulent interface in supersonic compressible plate turbulent boundary layer
	Su, Shuhuai 1; Long, Yanguang 1; Wang, Jinjun 1; Li XL(李新亮)2
通讯作者	Wang, Jinjun([email protected])
发表期刊	JOURNAL OF FLUID MECHANICS
	2024-06-03
卷号	988 页码:32
ISSN	0022-1120
摘要	The turbulent boundary layer (TBL) is a widely existing flow phenomenon in nature and engineering applications. Its strong mixing effect can achieve more sufficient material mixing, heat transport, etc. The understanding of the entrainment process and mechanism of irrotational fluids entering the turbulent region can be promoted by studying the geometric and dynamic characteristics of turbulent/non-turbulent interfaces (TNTI). In compressible flow, it is unclear whether the properties of TNTI will change and whether the entrainment will show different features due to the influence of compressibility. Based on the direct numerical simulation results of supersonic compressible plate TBLs with Mach number of 2.9, the geometric and dynamic characteristics of TNTI are investigated in this paper. The interface is identified by the enstrophy method, and the height, thickness, fractal dimension, enstrophy transportation and entrainment characteristics of the interface are investigated. It is found that for the enstrophy transportation in a TBL, the contribution of compressibility-related terms accounts for approximately 13.4 % of the total enstrophy transportation, which tends to transfer the enstrophy of turbulence near the interface to both directions vertical to the interface. This promotes the expansion of the turbulent region towards the non-turbulent region, and the mean height, thickness and entrainment velocity are increased by approximately 3.7 %, 7.0 % and 8.5 %, respectively, while the fractal dimension is basically unaffected. Different from the incompressible flow, the contribution of the compressibility-related terms to the entrainment velocity is independent of the local curvature, and the intense entrainment process is more likely to occur on a highly curved concave surface.
关键词	turbulent boundary layers compressible turbulence compressible boundary layers
DOI	10.1017/jfm.2024.439
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:001237592300001
关键词[WOS]	DIRECT NUMERICAL-SIMULATION ; ENTRAINMENT ; MOTIONS
WOS研究方向	Mechanics ; Physics
WOS类目	Mechanics ; Physics, Fluids & Plasmas
资助项目	National Natural Science Foundation of China[91852206] ; National Natural Science Foundation of China[11721202]
项目资助者	National Natural Science Foundation of China
论文分区	一类/力学重要期刊
力学所作者排名	3+
RpAuthor	Wang, Jinjun
引用统计	被引频次：1[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/311007/95499
专题	高温气体动力学国家重点实验室
作者单位	1.Beihang Univ, Fluid Mech Key Lab Educ Minist, Beijing 100191, Peoples R China; 2.Chinese Acad Sci, Inst Mech, LHD, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Su, Shuhuai,Long, Yanguang,Wang, Jinjun,et al. Investigations on the turbulent/non-turbulent interface in supersonic compressible plate turbulent boundary layer[J]. JOURNAL OF FLUID MECHANICS,2024,988:32.Rp_Au:Wang, Jinjun
APA	Su, Shuhuai,Long, Yanguang,Wang, Jinjun,&李新亮.(2024).Investigations on the turbulent/non-turbulent interface in supersonic compressible plate turbulent boundary layer.JOURNAL OF FLUID MECHANICS,988,32.
MLA	Su, Shuhuai,et al."Investigations on the turbulent/non-turbulent interface in supersonic compressible plate turbulent boundary layer".JOURNAL OF FLUID MECHANICS 988(2024):32.