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An ‘ideal’ form of decaying two-dimensional turbulence

Iwayama, T., Shepherd, T. G. and Watanabe, T. (2002) An ‘ideal’ form of decaying two-dimensional turbulence. Journal of Fluid Mechanics, 456. ISSN 0022-1120

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To link to this item DOI: 10.1017/S0022112001007509

Abstract/Summary

In decaying two-dimensional Navier-Stokes turbulence, Batchelor's similarity hypothesis fails due to the existence of coherent vortices. However, it is shown that decaying two-dimensional turbulence governed by the Harney-Hasegawa-Mima (CHM) equation ∂/∂t (V^2 φ-λ^2 φ)+J(φ,∇^2 φ)=D where D is a damping, is described well by Batchelor's similarity hypothesis for wave numbers k ≪ λ (the so-called AM regime). It is argued that CHM turbulence in the AM regime is a more `ideal' form of two-dimensional turbulence than is Navier-Stokes turbulence itself.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:32220

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