This article is cited in 8 papers

PLASMA, GASES

Dominant structures in jet streams

V. P. Goncharov^a, V. I. Pavlov<sup>b

a</sup> A. M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences
^b UFR de Mathématiques Pures et Appliquées, Université de Lille 1, 59655 Villeneuve d'Ascq, France

Abstract: A Hamiltonian version has been formulated for the model of axisymmetric equally rotating jet streams with a free boundary. In the framework of this approach, dominant structures, i.e., structure elements appearing in strongly disturbed jet streams at the preturbulent stage of their decay, are studied. It has been shown that compactons, i.e., solution with a compact support, can be such dominant structures. Analysis of the mechanism of the instability of compactons shows the possibility of collapse, which occurs almost without deformation of their shape but leads to the intensification of the vortex sheet at the boundary according to the law (t ₀ − t)⁻¹, where t ₀ is the collapse time.

PACS: 05.45.Yv, 47.10.+g, 47.15.ki, 47.32.cd

Received: 29.05.2006
Revised: 28.08.2006

 English version: Journal of Experimental and Theoretical Physics Letters, 2006, 84:7, 384–390

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