Astronomy and Astrophysics – Astrophysics – Instrumentation and Methods for Astrophysics
Scientific paper
2010-06-08
Mon.Not.Roy.Astron.Soc.408:669-683,2010
Astronomy and Astrophysics
Astrophysics
Instrumentation and Methods for Astrophysics
14 pages (15 in arXiv), 15 figures, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2010.17158.x
In smooth-particle hydrodynamics (SPH), artificial viscosity is necessary for the correct treatment of shocks, but often generates unwanted dissipation away from shocks. We present a novel method of controlling the amount of artificial viscosity, which uses the total time derivative of the velocity divergence as shock indicator and aims at completely eliminating viscosity away from shocks. We subject the new scheme to numerous tests and find that the method works at least as well as any previous technique in the strong-shock regime, but becomes virtually inviscid away from shocks, while still maintaining particle order. In particular sound waves or oscillations of gas spheres are hardly damped over many periods.
Cullen Lee
Dehnen Walter
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