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Number of degrees of freedom and energy spectrum of surface quasi-geostrophic turbulence

Published online by Cambridge University Press:  05 September 2011

Chuong V. Tran ,
Luke A. K. Blackbourn  and
Richard K. Scott
Chuong V. Tran*
Affiliation:
School of Mathematics and Statistics, University of St Andrews, St Andrews KY16 9SS, UK
Luke A. K. Blackbourn
Affiliation:
School of Mathematics and Statistics, University of St Andrews, St Andrews KY16 9SS, UK
Richard K. Scott
Affiliation:
School of Mathematics and Statistics, University of St Andrews, St Andrews KY16 9SS, UK
*
†Email address for correspondence: chuong@mcs.st-and.ac.uk
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Abstract

We study both theoretically and numerically surface quasi-geostrophic turbulence regularized by the usual molecular viscosity, with an emphasis on a number of classical predictions. It is found that the system’s number of degrees of freedom , which is defined in terms of local Lyapunov exponents, scales as , where is the Reynolds number expressible in terms of the viscosity, energy dissipation rate and system’s integral scale. For general power-law energy spectra , a comparison of with the number of dynamically active Fourier modes, i.e. the modes within the energy inertial range, yields . This comparison further renders the scaling for the exponential dissipation rate at the dissipation wavenumber. These results have been predicted on the basis of Kolmogorov’s theory. Our approach thus recovers these classical predictions and is an analytic alternative to the traditional phenomenological method. The implications of the present findings are discussed in conjunction with related results in the literature. Support for the analytic results is provided through a series of direct numerical simulations.

JFM classification

Geophysical and Geological Flows: Geostrophic turbulence Geophysical and Geological Flows: Quasi-geostrophic flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 684 , 10 October 2011 , pp. 427 - 440
Copyright
Copyright © Cambridge University Press 2011

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