Jet with entrained clouds. I - Hydrodynamic simulations and magnetic field structure

Details Jet with entrained clouds. I - Hydrodynamic simulations and magnetic field structure Jet with entrained clouds. I - Hydrodynamic simulations and magnetic field structure

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.214..337c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 214, June 1, 1985, p. 337-355.

Astronomy and Astrophysics

Astronomy

20

Bow Waves, Hydrodynamics, Interstellar Matter, Magnetic Field Configurations, Shock Wave Propagation, Supersonic Jet Flow, Entrainment, Extragalactic Radio Sources, Flow Equations, Galactic Structure, Mach Number

Scientific paper

The technique of Smoothed Particle hydrodynamics is successfully adapted to simulate axisymmetric flows and applied to the interaction between a freely expanding jet and a dense obstructing cloud. It is found that a stable bow shock is formed when a jet encounters an obstruction of diameter less than about half the jet diameter. Results are presented for flow simulations with adiabatic indices of 4/3 and 5/3, representing the cases in which the pressure due to relativistic particles is dominant and negligible, respectively, and for preshock Mach numbers of three and five. Shock morphology depends primarily upon the preshock Mach number, while the density compression ratio is most sensitive to the adiabatic index. The frozen-in magnetic field configuration is calculated for each flow simulation, and it is found that a small preshock toroidal field component may become dominant in a localized region immediately behind the apex of the bow shock.

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