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Characteristics of space-time energy spectra in turbulent channel flows
Wu T(吴霆); Geng CH(耿晨晖); Yao YC; Xu CX; He GW(何国威)
Source PublicationPHYSICAL REVIEW FLUIDS
2017-08-31
Volume2Issue:8Pages:084609
ISSN2469-990X
Abstract

An energy spectrum is preliminarily characterized by its mean and standard deviation. In this study, we derive exact expressions for the means and bandwidths of space-time energy spectra at fixed frequencies. The mean wave numbers are used to determine the phase velocities that bridge from temporal spectra to space-time spectra. The bandwidths are used to measure the well-known spectral broadening. We show that phase velocities alone are insufficient to determine the bandwidths of energy spectra. As a result, the cross-spectral method predicts narrower bandwidths of energy spectra. Therefore, in addition to phase velocities, amplitudes are used to rescale the space-time energy spectra, leading to the correct bandwidths. Existing data from direct numerical simulations of turbulent channel flows validate the rescaling approach.

DOI10.1103/PhysRevFluids.2.084609
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000408708700003
WOS KeywordSHEAR FLOWS ; SPATIOTEMPORAL SPECTRA ; WALL TURBULENCE ; REYNOLDS-NUMBER ; BOUNDARY-LAYER ; PRESSURE ; VELOCITY
WOS Research AreaPhysics
WOS SubjectPhysics, Fluids & Plasmas
Funding OrganizationNational Natural Science Foundation of China(11302238 ; Strategic Priority Research Program(XDB22040104) ; Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(QYZDJ-SSW-SYS002) ; National Basic Research Program of China (973 Program)(2013CB834100) ; 11232011 ; 11572331 ; 11490551)
DepartmentLNM湍流
ClassificationQ4
Ranking1
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/70049
Collection非线性力学国家重点实验室
Corresponding AuthorHe GW(何国威)
Recommended Citation
GB/T 7714
Wu T,Geng CH,Yao YC,et al. Characteristics of space-time energy spectra in turbulent channel flows[J]. PHYSICAL REVIEW FLUIDS,2017,2(8):084609.
APA Wu T,Geng CH,Yao YC,Xu CX,&He GW.(2017).Characteristics of space-time energy spectra in turbulent channel flows.PHYSICAL REVIEW FLUIDS,2(8),084609.
MLA Wu T,et al."Characteristics of space-time energy spectra in turbulent channel flows".PHYSICAL REVIEW FLUIDS 2.8(2017):084609.
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