Numerical simulation of the growth of thick accretion disks

Statistics – Computation

Scientific paper

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Accretion Disks, Computational Astrophysics, Stellar Mass Accretion, Adiabatic Flow, Angular Momentum, Computerized Simulation, Density Distribution, Isothermal Flow, Shock Wave Propagation

Scientific paper

Extensive numerical simulations of the accretion of adiabatic and isothermal material with net angular momentum by a central gravitating point mass are presented. The calculation is restricted to axial symmetry and to Newtonian gravity. The initial state is the appropriate Bondi flow, which is initially perturbed by adding abruptly a distribution of specific angular momentum. The evolution of the flow toward a thick equatorial disk with meridional internal circulation and an evacuated funnel near the axis is followed. An outer region of Bondi flow reforms after the passage of an expansion wave or shock wave. Some earlier analytical work by Henriksen and Heaton (1975) is found to yield a reasonable approximation for the shape of the final equatorial disk as a function of temperature, angular momentum, and gravitating mass. This result may have widespread utility.

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