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The spanwise spectra in wall-bounded turbulence
Wang HP; Wang SZ(王士召); He GW(何国威)

The pre-multiplied spanwise energy spectra of streamwise velocity fluctuations are investigated in this paper. Two distinct spectral peaks in the spanwise spectra are observed in low-Reynolds-number wall-bounded turbulence. The spectra are calculated from direct numerical simulation (DNS) of turbulent channel flows and zero-pressure-gradient boundary layer flows. These two peaks locate in the near-wall and outer regions and are referred to as the inner peak and the outer peak, respectively. This result implies that the streamwise velocity fluctuations can be separated into large and small scales in the spanwise direction even though the friction Reynolds number can be as low as 1000. The properties of the inner and outer peaks in the spanwise spectra are analyzed. The locations of the inner peak are invariant over a range of Reynolds numbers. However, the locations of the outer peak are associated with the Reynolds number, which are much higher than those of the outer peak of the pre-multiplied streamwise energy spectra of the streamwise velocity.

KeywordWall-bounded Turbulence Streamwise/spanwise Spectra Scale Separation Inner/outer Peak
Indexed BySCI ; EI ; CSCD
WOS IDWOS:000432609500004
WOS KeywordLarge-scale ; Channel Flow ; Layers ; Generation ; Database ; Region ; Model
WOS Research AreaEngineering ; Mechanics
WOS SubjectEngineering, Mechanical ; Mechanics
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)
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Recommended Citation
GB/T 7714
Wang HP,Wang SZ,He GW. The spanwise spectra in wall-bounded turbulence[J]. ACTA MECHANICA SINICA,2018,34(3):452-461.
APA Wang HP,Wang SZ,&He GW.(2018).The spanwise spectra in wall-bounded turbulence.ACTA MECHANICA SINICA,34(3),452-461.
MLA Wang HP,et al."The spanwise spectra in wall-bounded turbulence".ACTA MECHANICA SINICA 34.3(2018):452-461.
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