Nonlinear Shear Instabilities in an Infinite Slab

Details Nonlinear Shear Instabilities in an Infinite Slab Nonlinear Shear Instabilities in an Infinite Slab

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...112..223n&link_type=abstract

Astronomy and Astrophysics, Vol.112, P. 223, 1982

Astronomy and Astrophysics

Astrophysics

4

Scientific paper

The dynamical evolution of an infinite slab moving in denser and noisy (turbulent) surroundings is investigated with a 2D hydrodynamic code. The applicability of the results to astrophysical jets is discussed.
Inviscid beams show internal shocks at regular intervals of a few beamwidths. Kinks are not obvious. In viscous beams shocks are less outspoken, but turbulence is triggered with maximum scales of a few beamwidths. These viscous beams broaden.
Linear stability analysis may hold up to a few e-folding times, although the seed disturbance field is not infinitesimal.
The computations suggest that viscous astrophysical beams may become blurred quite suddenly and may give rise to sudden change in radiation patterns (NGC 1265).

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