Abstract
Instabilities in astrophysical jets are studied in the nonlinear regime by performing 2D numerical classical gasdynamical calculations. Two kinds of instabilities are studied:
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(1)
Those which arise from unsteadiness in output from the central engine feeding the jets, and
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(2)
Those which arise from a beam in a turbulent surrounding.
An extra power output an order of magnitude higher than is normally delivered by the engine over a time equal to (nozzle length)/(sound velocity at center) causes a nonlinear Kelvin-Helmholtz instability in the jet walls. Constrictions move outwards, but the jet structure is left untouched. A beam in turbulent surroundings produces internal shocks over distances of a few beam widths. If viscosity is present the throughput of material is hampered on time scales of a few beam radius sound travel times. The implication are discussed.
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© 1983 D. Reidel Publishing Company
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Nepveu, M. (1983). Instabilities in Astrophysical Jets. In: Ferrari, A., Pacholczyk, A.G. (eds) Astrophysical Jets. Astrophysics and Space Science Library, vol 103. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7186-8_33
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DOI: https://doi.org/10.1007/978-94-009-7186-8_33
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-009-7188-2
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