Statistics – Computation
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...400l...9h&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 400, no. 1, p. L9-L12.
Statistics
Computation
44
Elliptical Galaxies, Extragalactic Radio Sources, Kelvin-Helmholtz Instability, Supersonic Jet Flow, Three Dimensional Bodies, Computational Astrophysics, Digital Simulation, Flow Geometry
Scientific paper
A three-dimensional hydrodynamical simulation of a cylindrical jet initialized across a Cartesian grid has been performed. The jet is driven at the origin by a small-amplitude precession to break the symmetry and excite helical modes of the Kelvin-Helmholtz instability. The simulation reveals a wealth of structures including filaments twisted around the circumference of the jet. Rapid spatial growth of relatively small amplitude filaments that can be attributed to high-order Kelvin-Helmholtz fluting modes is overwhelmed at larger distance by a slower spatially growing helically twisted elliptical distortion of the jet cross section. At slightly larger spatial scales, the jet is helically twisted and the flow bifurcates (trifurcates) as a further development of the elliptical (triangular) Kelvin-Helmholtz fluting modes. The observed behavior of this simulation is in good agreement with linear stability theory. The observed large-amplitude bifurcation of the flow into a helically twisted filament pair overlaying a helical twist of the whole jet appears similar to the observed oscillation and twisted filament pair seen in the Cygnus A jet. The small-amplitude multiple filamentation observed appears similar to the filamentation seen in the M87 jet inside knot A.
Clarke David A.
Hardee Philip E.
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