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Implementing and comparing sink particles in AMR and SPH

Federrath, Christoph, Banerjee, Robi, Seifried, Daniel, Clark, Paul and Klessen, Ralf S. 2011. Implementing and comparing sink particles in AMR and SPH. Proceedings of the International Astronomical Union 6 (S270) , pp. 425-428. 10.1017/S1743921311000755

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Abstract

We implemented sink particles in the Adaptive Mesh Refinement (AMR) code FLASH to model the gravitational collapse and accretion in turbulent molecular clouds and cores. Sink particles are frequently used to measure properties of star formation in numerical simulations, such as the star formation rate and efficiency, and the mass distribution of stars. We show that only using a density threshold for sink particle creation is insufficient in case of supersonic flows, because the density can exceed the threshold in strong shocks that do not necessarily lead to local collapse. Additional physical collapse indicators have to be considered. We apply our AMR sink particle module to the formation of a star cluster, and compare it to a Smoothed Particle Hydrodynamics (SPH) code with sink particles. Our comparison shows encouraging agreement of gas and sink particle properties between the AMR and SPH code.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: accretion; accretion disks; hydrodynamics; ISM: kinematics and dynamics; ISM: jets and outflows; methods: numerical; shock waves; stars: formation; turbulence
Publisher: Cambridge University Press
ISSN: 1743-9213
Last Modified: 04 Jun 2017 06:25
URI: http://orca.cf.ac.uk/id/eprint/59818

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