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

Journal Article · Wed Apr 01 04:00:00 EST 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165157· OSTI ID:5931264

Fryxell, B A; Taam, R E; Mcmillan, S L.W.

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. 16 references.

• Research Organization: Chicago Univ., IL; Northwestern Univ., Evanston, IL
• OSTI ID: 5931264
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 315; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ADIABATIC PROCESSES
BOUNDARY-VALUE PROBLEMS
COSMIC RADIO SOURCES
DENSITY
FLUID FLOW
MATHEMATICAL MODELS
NUMERICAL SOLUTION
PHYSICAL PROPERTIES
PLASMA JETS
SIMULATION
STAR ACCRETION
STAR EVOLUTION
SUPERSONIC FLOW