Introducing a hybrid method of radiative transfer in smoothed particle hydrodynamics

Forgan, Duncan, Rice, Ken, Stamatelos, Dimitrios and Whitworth, Anthony Peter ORCID: https://orcid.org/0000-0002-1178-5486 2009. Introducing a hybrid method of radiative transfer in smoothed particle hydrodynamics. Presented at: Cool stars, stellar systems and the sun, St. Andrews, UK, 21-25 July 2008. Published in: Stempels, E. ed. Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, St Andrews, UK, 21-25 July 2008. AIP Conference Proceedings (1094) Melville, NY: American Institute of Physics, pp. 377-380. 10.1063/1.3099124

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Abstract

We present a new method of incorporating radiative transfer into Smoothed Particle Hydrodynamics (SPH). There have been many recent attempts at radiative transfer in SPH [10, 11, 5, 13], however these are becoming increasingly complex, with some methods requiring the photosphere to be mapped (which is often of non‐trivial geometric shape), and extra conditions to be applied there (matching atmospheres as in [2], or specifying cooling at the photosphere as in [5]). The method of identifying the photosphere is usually a significant addition to the total simulation runtime, and often requires extra free parameters, the changing of which will affect the final results. Our method is not affected by such concerns, as the photosphere is constructed implicitly by the algorithm without the need for extra free parameters. The algorithm used is a synergy of two current formalisms for radiative effects: a) the polytropic cooling formalism proposed by [12], and b) flux‐limited diffusion, used by many authors to simulate radiation transport in the optically thick regime (e.g. [5]). We present several tests of this method:

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	radiative transfer, hydrodynamics, star formation
Publisher:	American Institute of Physics
ISBN:	9780735406278
Last Modified:	19 Oct 2022 10:01
URI:	https://orca.cardiff.ac.uk/id/eprint/22930

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