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Critical balance in magnetohydrodynamic, rotating and stratified turbulence: towards a universal scaling conjecture

Published online by Cambridge University Press:  29 March 2011

SERGEI V. NAZARENKO
Affiliation:
Mathematics Institute, University of Warwick, Coventry CV4 7AL, UK Institut Henri Poincaré, Université Pierre et Marie Curie, 75231 Paris CEDEX 5, France
ALEXANDER A. SCHEKOCHIHIN*
Affiliation:
Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford OX1 3NP, UK Institut Henri Poincaré, Université Pierre et Marie Curie, 75231 Paris CEDEX 5, France
*
Email address for correspondence: a.schekochihin1@physics.ox.ac.uk

Abstract

It is proposed that critical balance – a scale-by-scale balance between the linear propagation and nonlinear interaction time scales – can be used as a universal scaling conjecture for determining the spectra of strong turbulence in anisotropic wave systems. Magnetohydrodynamic (MHD), rotating and stratified turbulence are considered under this assumption and, in particular, a novel and experimentally testable energy cascade scenario and a set of scalings of the spectra are proposed for low-Rossby-number rotating turbulence. It is argued that in neutral fluids the critically balanced anisotropic cascade provides a natural path from strong anisotropy at large scales to isotropic Kolmogorov turbulence at very small scales. It is also argued that the k−2 spectra seen in recent numerical simulations of low-Rossby-number rotating turbulence may be analogous to the k−3/2 spectra of the numerical MHD turbulence in the sense that they could be explained by assuming that fluctuations are polarised (aligned) approximately as inertial waves (Alfvén waves for MHD).

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Type
Papers
Copyright
Copyright © Cambridge University Press 2011

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