Energy dissipation and flux laws for unsteady turbulence

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Title: Energy dissipation and flux laws for unsteady turbulence
Authors: Goto, S
Vassilicos, JC
Item Type: Journal Article
Abstract: Direct Numerical Simulations of unsteady spatially periodic turbulence with time-dependent rms velocity u′(t) and integral length-scale L(t) show that not only the instantaneous energy dissipation rate but also the instantaneous energy flux at intermediate wavenumbers scales as View the MathML source where U0 and L0 are velocity and length scales characterizing initial or overall unsteady turbulence conditions. These high Reynolds number scalings are qualitatively different from the well-known u′(t)3/L(t) cornerstone scalings of equilibrium turbulence where the energy flux and dissipation are exactly balanced at all times.
Issue Date: 18-Feb-2015
Date of Acceptance: 13-Feb-2015
URI: http://hdl.handle.net/10044/1/42349
DOI: http://dx.doi.org/10.1016/j.physleta.2015.02.025
ISSN: 0375-9601
Publisher: Elsevier
Start Page: 1144
End Page: 1148
Journal / Book Title: Physics Letters A
Volume: 379
Issue: 16-17
Copyright Statement: © 2015 Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Science & Technology
Physical Sciences
Physics, Multidisciplinary
Physics
Turbulence
Energy dissipation
Energy flux
Direct numerical simulation
Fluids & Plasmas
01 Mathematical Sciences
02 Physical Sciences
Publication Status: Published
Appears in Collections:Faculty of Engineering
Aeronautics



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