DOI: 10.1002/grl.50337
论文题名: The influence of migrating bed forms on the velocity-intermittency structure of turbulent flow over a gravel bed
作者: Keylock C.J. ; Singh A. ; Foufoula-Georgiou E.
刊名: Geophysical Research Letters
ISSN: 0094-9178
EISSN: 1944-8909
出版年: 2013
卷: 40, 期: 7 起始页码: 1351
结束页码: 1355
语种: 英语
英文关键词: Bedforms
; Closure schemes
; Intermittency
; Turbulence
Scopus关键词: Bedforms
; Closure schemes
; Geophysical turbulence
; High Reynolds number
; Intermittency
; Shorter wavelength
; Turbulence closures
; Turbulent intermittency
; Energy transfer
; Geophysics
; Gravel
; Navier Stokes equations
; Structural geology
; Turbulence
; Turbulent flow
; Velocity
; bedform
; eddy
; energy flux
; moisture flux
; Navier-Stokes equations
; numerical model
; turbulence
; turbulent flow
; velocity profile
英文摘要: Modeling turbulent flows at high Reynolds number requires solving simplified variants of the Navier-Stokes equations. The methods used to close the resulting Reynolds-averaged, or eddy simulation equations usually follow classical theory and, at small enough scales, postulate universal scaling for turbulence that is independent of the velocity itself. This may not be the best way to conceptualize geophysical turbulence. Turbulent intermittency may be defined in terms of the local "roughness" of the velocity signal as measured by pointwise Hölder exponents. This study investigates the joint velocity-intermittency structure of flow over a gravel-bed surface with migrating bed forms. We report clear velocity-intermittency dependence and quantify its nature above the moving bed form profile. Our results imply differences in energy transfer close to bed forms at shorter wavelengths than those forced directly. Hence, progress in modeling flows of geophysical relevance may require a reconsideration of the principles on which turbulence closures are based. Key Points Bedforms fundamentally alter turbulence scaling The velocity-intermittency structure is also complex Improved turbulence closures will result from consideration of these principles ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876910052&doi=10.1002%2fgrl.50337&partnerID=40&md5=a5c5db4086c99606419318ef72a49f43
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6442
Appears in Collections: 气候减缓与适应
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作者单位: Department of Civil and Structural Engineering, Sheffield Fluid Mechanics Group, University of Sheffield, Mappin Street, Sheffield, S1 3JD, United Kingdom
Recommended Citation:
Keylock C.J.,Singh A.,Foufoula-Georgiou E.. The influence of migrating bed forms on the velocity-intermittency structure of turbulent flow over a gravel bed[J]. Geophysical Research Letters,2013-01-01,40(7).