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Astron. Astrophys. 325, 857-865 (1997)

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Modified artificial viscosity in Smooth Particle Hydrodynamics

M. Selhammar

Uppsala Astronomical Observatory, Box 515, S-751 20 Uppsala, Sweden (Magnus.Selhammar@astro.uu.se)

Received 16 September 1995 / Accepted 19 November 1996

Abstract

Artificial viscosity is needed in Smooth Particle Hydrodynamics to prevent interparticle penetration, to allow shocks to form and to damp post shock oscillations. Artificial viscosity may, however, lead to problems such as unwanted heating and unphysical solutions. A modification of the standard artificial viscosity recipe is proposed which reduces these problems. Some test cases discussed.

Key words: accretion, accretion disks – hydrodynamics – shock waves – stars: formation – galaxies: formation

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© European Southern Observatory (ESO) 1997

Online publication: April 28, 1998

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