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]
Three-Dimensional Evolution of Magnetic and Velocity Shear Driven Instabilities in a Current-Vortex Sheet
BETTARINI, LAPO;LANDI, SIMONE;VELLI, MARCO;
2009
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.File | Dimensione | Formato | |
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