Three-Dimensional Evolution of Magnetic and Velocity Shear Driven Instabilities in a Current-Vortex Sheet

Bettarini, Lapo; Landi, Simone; Velli, Marco; Londrillo, P.

doi:10.1063/1.3142467

The problem of three-dimensional combined magnetic and velocity shear driven instabilities of a compressible magnetized jet modeled as a plane neutral/current double vortex sheet in the framework of the resistive magnetohydrodynamics is addressed. The resulting dynamics given by the stream+current sheet interaction is analyzed and the effects of a variable geometry of the basic fields are considered. Depending on the basic asymptotic magnetic field configuration, a selection rule of the linear instability modes can be obtained. Hence, the system follows a two-stage path developing either through a fully three-dimensional dynamics with a rapid evolution of kink modes leading to a final turbulent state, or rather through a driving two-dimensional instability pattern that develops on parallel planes on which a reconnection+coalescence process takes place.

Three-Dimensional Evolution of Magnetic and Velocity Shear Driven Instabilities in a Current-Vortex Sheet / L.Bettarini; S. Landi; M. Velli; P. Londrillo. - In: PHYSICS OF PLASMAS. - ISSN 1070-664X. - STAMPA. - 16(2009), pp. 062302-062302-15. [10.1063/1.3142467]

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Titolo:	Three-Dimensional Evolution of Magnetic and Velocity Shear Driven Instabilities in a Current-Vortex Sheet
Autori di Ateneo:	BETTARINI, LAPO LANDI, SIMONE VELLI, MARCO P. Londrillo mostra contributor esterni nascondi contributor esterni
Autori:	BETTARINI, LAPO; LANDI, SIMONE; VELLI, MARCO; P. Londrillo
Anno di registrazione:	2009
Rivista:	PHYSICS OF PLASMAS
Volume:	16
Pagina iniziale:	062302
Pagina finale:	062302-15
Abstract:	The problem of three-dimensional combined magnetic and velocity shear driven instabilities of a compressible magnetized jet modeled as a plane neutral/current double vortex sheet in the framework of the resistive magnetohydrodynamics is addressed. The resulting dynamics given by the stream+current sheet interaction is analyzed and the effects of a variable geometry of the basic fields are considered. Depending on the basic asymptotic magnetic field configuration, a selection rule of the linear instability modes can be obtained. Hence, the system follows a two-stage path developing either through a fully three-dimensional dynamics with a rapid evolution of kink modes leading to a final turbulent state, or rather through a driving two-dimensional instability pattern that develops on parallel planes on which a reconnection+coalescence process takes place.
Handle:	http://hdl.handle.net/2158/382051
Appare nelle tipologie:	1a - Articolo su rivista

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