On the wavenumber-frequency spectrum of the wall pressure fluctuations in turbulent channel flow

doi:10.1017/jfm.2022.137

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	On the wavenumber-frequency spectrum of the wall pressure fluctuations in turbulent channel flow
	Yang BW(杨博文)1,2,3 ; Yang ZX(杨子轩)1,2
通讯作者	Yang, Zixuan(yangzx@imech.ac.cn)
发表期刊	JOURNAL OF FLUID MECHANICS
	2022-03-03
卷号	937 页码:27
ISSN	0022-1120
摘要	Direct numerical simulations (DNS) of turbulent channel flows up to Re-tau approximate to 1000 are conducted to investigate the three-dimensional (consisting of streamwise wavenumber, spanwise wavenumber and frequency) spectrum of wall pressure fluctuations. To develop a predictive model of the wavenumber-frequency spectrum from the wavenumber spectrum, the time decorrelation mechanisms of wall pressure fluctuations are investigated. It is discovered that the energy-containing part of the wavenumber-frequency spectrum of wall pressure fluctuations can be well predicted using a similar random sweeping model for streamwise velocity fluctuations. To refine the investigation, we further decompose the spectrum of the total wall pressure fluctuations into the autospectra of rapid and slow pressure fluctuations, and the cross-spectrum between them. We focus on evaluating the assumption applied in many predictive models, that is, the magnitude of the cross-spectrum is negligibly small. The present DNS shows that neglecting the cross-spectrum causes a maximum error up to 4.7 dB in the subconvective region for all Reynolds numbers under test. Our analyses indicate that the approximation of neglecting the cross-spectrum needs to be applied carefully in the investigations of acoustics at low Mach numbers, in which the subconvective components of wall pressure fluctuations make important contributions to the radiated acoustic power.
关键词	turbulence simulation turbulence modelling
DOI	10.1017/jfm.2022.137
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000763547000001
关键词[WOS]	BOUNDARY-LAYER ; MODEL ; AEROACOUSTICS ; GENERATION ; FEATURES ; FLUID ; FIELD
WOS研究方向	Mechanics ; Physics
WOS类目	Mechanics ; Physics, Fluids & Plasmas
资助项目	NSFC Basic Science Center Program for 'Multiscale Problems in Nonlinear Mechanics'[11988102] ; National Key Project[GJXM92579] ; Strategic Priority Research Program[XDB22040104]
项目资助者	NSFC Basic Science Center Program for 'Multiscale Problems in Nonlinear Mechanics' ; National Key Project ; Strategic Priority Research Program
论文分区	一类/力学重要期刊
力学所作者排名	1
RpAuthor	Yang, Zixuan
引用统计	被引频次：4[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/311007/88731
专题	非线性力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; 3.IST Austria, Campus 1, A-3400 Klosterneuburg, Austria
推荐引用方式 GB/T 7714	Yang BW,Yang ZX. On the wavenumber-frequency spectrum of the wall pressure fluctuations in turbulent channel flow[J]. JOURNAL OF FLUID MECHANICS,2022,937:27.
APA	杨博文,&杨子轩.(2022).On the wavenumber-frequency spectrum of the wall pressure fluctuations in turbulent channel flow.JOURNAL OF FLUID MECHANICS,937,27.
MLA	杨博文,et al."On the wavenumber-frequency spectrum of the wall pressure fluctuations in turbulent channel flow".JOURNAL OF FLUID MECHANICS 937(2022):27.

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