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Magnetohydrodynamic Kelvin-Helmholtz instabilities in astrophysics. 3. Hydrodynamic flows with shear layers

Journal Article:

Abstract

In this paper a discussion is presented on Kelvin-Helmholtz instabilities in pressure-confined two-dimensional flows (slabs) delimited by boundary layers with velocity and density gradients. It is found that the fastest growing modes in supersonic flows are produced by perturbations reflecting at the boundaries and have wavelengths of the order of the slab width; this peak of instability is even more evident than in the case of vortex-sheet cylindrical flows, discussed in a previous paper. From a comparison of the results for the two-dimensional slab and three-dimensional cylinder it is concluded that a two-dimensional treatment provides an adequate description of instabilities in fluid flows. In this analogy, symmetric and antisymmetric modes in the slab correspond to pinching and helical modes in the cylinder. In the final section a comparison is attempted of the results obtained with morphologies in collimated jets in extragalactic radio sources; general characteristics appear to be classifiable in terms of scale-lengths of the velocity and density gradients in the boundary layers.
Authors:
Ferraro, A; [1]  Max-Planck-Institut fuer Extraterrestrische Physik, Garching (Germany, F.R.)); Massaglia, S; [2]  Trussoni, E [1] 
  1. Consiglio Nazionale delle Ricerche, Turin (Italy). Lab. di Cosmo-Geofisica
  2. Turin Univ. (Italy). Ist. di Fisica
Publication Date:
Mar 01, 1982
Product Type:
Journal Article
Reference Number:
AIX-13-682126; EDB-82-116619
Resource Relation:
Journal Name: Mon. Not. R. Astron. Soc.; (United Kingdom); Journal Volume: 198:3
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COSMIC RADIO SOURCES; JETS; HELMHOLTZ INSTABILITY; SUPERSONIC FLOW; ASTROPHYSICS; BOUNDARY LAYERS; DENSITY; DISTURBANCES; MAGNETOHYDRODYNAMICS; OSCILLATION MODES; SHEAR; TWO-DIMENSIONAL CALCULATIONS; VELOCITY; FLUID FLOW; FLUID MECHANICS; HYDRODYNAMICS; INSTABILITY; LAYERS; MECHANICS; PHYSICAL PROPERTIES; PLASMA INSTABILITY; PLASMA MACROINSTABILITIES; 640106* - Astrophysics & Cosmology- Cosmology; 640103 - Astrophysics & Cosmology- Quasi-Stellar, Radio, & X-Ray Sources- (-1987)
OSTI ID:
5423065
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: MNRAA
Submitting Site:
HEDB
Size:
Pages: 1065-1079
Announcement Date:

Journal Article:

Citation Formats

Ferraro, A, Max-Planck-Institut fuer Extraterrestrische Physik, Garching (Germany, F.R.)), Massaglia, S, and Trussoni, E. Magnetohydrodynamic Kelvin-Helmholtz instabilities in astrophysics. 3. Hydrodynamic flows with shear layers. United Kingdom: N. p., 1982. Web.
Ferraro, A, Max-Planck-Institut fuer Extraterrestrische Physik, Garching (Germany, F.R.)), Massaglia, S, & Trussoni, E. Magnetohydrodynamic Kelvin-Helmholtz instabilities in astrophysics. 3. Hydrodynamic flows with shear layers. United Kingdom.
Ferraro, A, Max-Planck-Institut fuer Extraterrestrische Physik, Garching (Germany, F.R.)), Massaglia, S, and Trussoni, E. 1982. "Magnetohydrodynamic Kelvin-Helmholtz instabilities in astrophysics. 3. Hydrodynamic flows with shear layers." United Kingdom.
@misc{etde_5423065,
title = {Magnetohydrodynamic Kelvin-Helmholtz instabilities in astrophysics. 3. Hydrodynamic flows with shear layers}
author = {Ferraro, A, Max-Planck-Institut fuer Extraterrestrische Physik, Garching (Germany, F.R.)), Massaglia, S, and Trussoni, E}
abstractNote = {In this paper a discussion is presented on Kelvin-Helmholtz instabilities in pressure-confined two-dimensional flows (slabs) delimited by boundary layers with velocity and density gradients. It is found that the fastest growing modes in supersonic flows are produced by perturbations reflecting at the boundaries and have wavelengths of the order of the slab width; this peak of instability is even more evident than in the case of vortex-sheet cylindrical flows, discussed in a previous paper. From a comparison of the results for the two-dimensional slab and three-dimensional cylinder it is concluded that a two-dimensional treatment provides an adequate description of instabilities in fluid flows. In this analogy, symmetric and antisymmetric modes in the slab correspond to pinching and helical modes in the cylinder. In the final section a comparison is attempted of the results obtained with morphologies in collimated jets in extragalactic radio sources; general characteristics appear to be classifiable in terms of scale-lengths of the velocity and density gradients in the boundary layers.}
journal = {Mon. Not. R. Astron. Soc.; (United Kingdom)}
volume = {198:3}
journal type = {AC}
place = {United Kingdom}
year = {1982}
month = {Mar}
}