Nonlinear stability of relativistic sheared planar jets

Nonlinear stability of relativistic sheared planar jets

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Nonlinear stability of relativistic sheared planar jets

Show simple item record Perucho Pla, Manuel Marti Puig, Jose Maria Hanasz, M. 2010-08-10T10:50:56Z 2010-08-10T10:50:56Z 2005
dc.language.iso en en
dc.relation en
dc.source Perucho, M. ; Martí, J. Mª ; Hanasz, M. Nonlinear stability of relativistic sheared planar jets. En: Astronomy & Astrophysics, 2005, vol. 443, no. 3, December I, p. 863-881 en
dc.subject Galaxies: jets ; Hydrodynamics ; Instabilities en
dc.title Nonlinear stability of relativistic sheared planar jets en
dc.type journal article es_ES
dc.identifier.doi 10.1051/0004-6361:20053115 en
dc.description.abstractenglish The linear and non-linear stability of sheared, relativistic planar jets is studied by means of linear stability analysis and numerical hydrodynamical simulations. Our results extend the previous Kelvin-Hemlholtz stability studies for relativistic, planar jets in the vortex sheet approximation performed by Perucho et al. (2004a, A&A, 427, 415; 2004b, A&A, 427, 431) by including a shear layer between the jet and the external medium and more general perturbations. The models considered span a wide range of Lorentz factors (2.5-20) and internal energies ( $0.08\,c^2{-}60\,c^2$) and are classified into three classes according to the main characteristics of their long-term, non-linear evolution. We observe a clear separation of these three groups in a relativistic Mach-number Lorentz-factor plane. Jets with a low Lorentz factor and small relativistic Mach number are disrupted after saturation. Those with a large Lorentz factor and large relativistic Mach number are the stablest, due to the appearance of short wavelength resonant modes which generate local mixing and heating in the shear layer around a fast, unmixed core, giving a plausible solution for the problem of the long-term stability of relativistic jets. A third group is present between them, including jets with intermediate values of Lorentz factor and relativistic Mach number, which are disrupted by a slow process of mixing favored by an efficient and continuous conversion of kinetic into internal energy. In the long term, all the models develop a distinct transversal structure (shear/transition layers) as a consequence of KH perturbation growth, depending on the class they belong to. The properties of these shear layers are analyzed in connection with the parameters of the original jet models. en
dc.description.private en
dc.identifier.idgrec 027883 en
dc.type.hasVersion VoR es_ES

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