Numerical simulations of accretion discs. II - Design and implementation of a new numerical method

Statistics – Computation

Scientific paper

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Accretion Disks, Compressible Flow, Computational Astrophysics, Digital Simulation, Dwarf Novae, Mass Transfer, Computer Programs, Equations Of Motion, Mathematical Models, Runge-Kutta Method, Tidal Waves

Scientific paper

A novel numerical simulation scheme designed to calculate compressible gas-flows in accretion discs is described. This is then applied to the study of accretion disc behaviour in the wake of a mass-transfer burst in a dwarf nova system. The disc is predicted to be dominated by tidal forces throughout much of the outburst-quiescent cycle. These results are, however, found to be incompatible with the observations of the dwarf novae SS Cygni and U Geminorum in outburst. This is interpreted as evidence against the simple mass-transfer burst model of dwarf novae outbursts and instead as indirect evidence for the variation in viscosity between quiescence and outburst.

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