Large eddy simulation on the effect of free-stream turbulence on bypass transition

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	Large eddy simulation on the effect of free-stream turbulence on bypass transition
	Xu, Zhengqian 1; Zhao, Qingjun 2,3; Lin, Qizhao 1; Xu, Jianzhong 2
刊名	INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
	2015-08-01
卷号	54 页码:131-142
关键词	Boundary layer Bypass transition Large eddy simulation Receptivity
英文摘要	The effect of free-stream turbulence (FST) on bypass transition in a zero-pressure-gradient boundary layer is investigated by means of Large Eddy Simulation (LES). The broadband turbulent inflow is synthesized to validate the feasibility of LES. Both a zero-thickness plate and one with super-ellipse leading-edge are addressed. The calculated Reynolds-averaged fields are compared with experimental data and decent agreement is achieved. Instantaneous fields show the instability occurs in the lifted low-speed streaks similar to earlier DNS results, which can be ascribed to outer mode. Various inflows with bi-/tri-mode interaction are specified to analyze effects of particular frequency mode on the instability pattern and multifarious transition or non-transition scenarios are obtained. Outer instability is observed in the cases with one low-frequency mode and one high-frequency mode inflow as reported by Zaki and Durbin (2005), and with one more high-frequency mode appended. Inner instability is observed in the case with a low-frequency dominant inflow, while the high-frequency mode is indispensable to induce the secondary instability. Furthermore, the results show that the transition onset is highly sensitive to low-frequency mode while the transition rate is highly sensitive to high-frequency mode. Finally, the formational frequency of turbulent spot (FFTS) is counted and the frequency of laminar streaks is demonstrated by spectral analysis. (C) 2015 Elsevier Inc. All rights reserved.
WOS标题词	Science & Technology ; Physical Sciences ; Technology
类目[WOS]	Thermodynamics ; Engineering, Mechanical ; Mechanics
研究领域[WOS]	Thermodynamics ; Engineering ; Mechanics
关键词[WOS]	BOUNDARY-LAYER-TRANSITION ; NUMERICAL SIMULATIONS ; PRESSURE-GRADIENT ; SCALE ; FLOW ; RECEPTIVITY ; SUBJECT ; MODEL
收录类别	SCI
语种	英语
WOS记录号	WOS:000358817700012
公开日期	2015-12-22
内容类型	期刊论文
源URL	[http://ir.etp.ac.cn/handle/311046/98927]
专题	工程热物理研究所_中国科学院工程热物理所（论文库）_期刊论文（SCI）
作者单位	1.Univ Sci & Technol China, Dept Thermal Sci & Energy Engn, Hefei 230026, Anhui, Peoples R China 2.Chinese Acad Sci, Inst Engn Thermophys, Beijing 100190, Peoples R China 3.Chinese Acad Sci, Key Lab Light Duty Gas Turbine, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Xu, Zhengqian,Zhao, Qingjun,Lin, Qizhao,et al. Large eddy simulation on the effect of free-stream turbulence on bypass transition[J]. INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW,2015,54:131-142.
APA	Xu, Zhengqian,Zhao, Qingjun,Lin, Qizhao,&Xu, Jianzhong.(2015).Large eddy simulation on the effect of free-stream turbulence on bypass transition.INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW,54,131-142.
MLA	Xu, Zhengqian,et al."Large eddy simulation on the effect of free-stream turbulence on bypass transition".INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW 54(2015):131-142.