Numerical simulations of adiabatic axisymmetric accretion flow. I - A new mechanism for the formation of jets

Details Numerical simulations of adiabatic axisymmetric accretion flow. I - A new mechanism for the formation of jets Numerical simulations of adiabatic axisymmetric accretion flow. I - A new mechanism for the formation of jets

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315..536f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 315, April 15, 1987, p. 536-554.

Astronomy and Astrophysics

Astronomy

40

Adiabatic Flow, Astronomical Models, Axisymmetric Flow, Radio Jets (Astronomy), Stellar Mass Accretion, Boundary Conditions, Boundary Value Problems, Density Distribution, Pressure Distribution, Velocity Distribution

Scientific paper

Numerical simulations of the uniform axisymmetric flow past a gravitating sphere have been studied. It is found that the structure of the flow is extremely sensitive to the boundary condition at the surface of the gravitating object. For the case in which the boundary is totally absorbing, a steady state flow is reached. However, for a boundary which is not totally absorbing, steady state flows are not obtained. The morphology of the flow is also sensitive to the Mach number at infinity and to the ratio of the free-fall velocity at the surface of the gravitating object to the flow velocity at inifinity. A new mechanism for the formation of jets is identified in which a fraction of the accretion energy is tapped to drive an anisotropic supersonic outflow with collimation provided by a combination of the inertia of matter which surrounds the beam and the development of multiple shock structures.

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