DOI: 10.1002/grl.50663
论文题名: A model for the viscous dissipation rate in stably stratified, sheared turbulence
作者: Fossum H.E. ; Wingstedt E.M.M. ; Reif B.A.P.
刊名: Geophysical Research Letters
ISSN: 0094-8799
EISSN: 1944-8530
出版年: 2013
卷: 40, 期: 14 起始页码: 3744
结束页码: 3749
语种: 英语
英文关键词: Direct numerical simulation
; Kelvin-Helmholtz
; Stratification
; Viscous dissipation model
Scopus关键词: Background temperature
; Fluctuating velocities
; Functional dependence
; Incompressible turbulent flow
; Kelvin-Helmholtz
; Turbulence dissipation rate
; Viscous dissipation
; Viscous dissipation rate
; Direct numerical simulation
; Mixing
; Thermal stratification
; Velocity
; Viscous flow
; Turbulence
; dissipation
; isotropy
; Kelvin-Helmholtz instability
; numerical model
; temperature effect
; turbulent flow
; velocity
; viscosity
英文摘要: A model for the turbulence dissipation rate in stably stratified shear turbulence is developed and validated. The functional dependence of the model is derived from first principles and it represents a conceptually new approach in that it depends on the background temperature field rather than on the fluctuating velocity field. This novel feature makes the proposed model a viable candidate for dissipation rate estimates in measured real-life flows. Direct numerical simulation data are used for a priori assessment of the proposed model. It is demonstrated that the proposed model performs very well, particularly in cases where the background stratification becomes dynamically important. Also, a generalized expression for the mixing coefficient has been rigorously derived from first principles assuming local isotropy of incompressible turbulent flows. The mixing coefficient is shown to depend on the Prandtl number and values are in correspondence with previous studies. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84880194752&doi=10.1002%2fgrl.50663&partnerID=40&md5=947312952ad66b72bc2f5cee32fd6393
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6063
Appears in Collections: 气候减缓与适应
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作者单位: Norwegian Defence Research Establishment (FFI), PO Box 25, NO-2027 Kjeller, Norway
Recommended Citation:
Fossum H.E.,Wingstedt E.M.M.,Reif B.A.P.. A model for the viscous dissipation rate in stably stratified, sheared turbulence[J]. Geophysical Research Letters,2013-01-01,40(14).