Universität zu Köln

Wuensch, Richard, Walch, Stefanie ORCID: 0000-0001-6941-7638, Dinnbier, Frantisek, Seifried, Daniel, Haid, Sebastian ORCID: 0000-0001-7541-4935, Klepitko, Andre, Whitworth, Anthony P. and Palous, Jan ORCID: 0000-0001-6729-2851 (2021). Tree-based solvers for adaptive mesh refinement code flash - II: radiation transport module TreeRay. Mon. Not. Roy. Astron. Soc., 505 (3). S. 3730 - 3755. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

The treatment of radiative transfer with multiple radiation sources is a critical challenge in simulations of star formation and the interstellar medium (ISM). In this paper, we present the novel TREERAY method for solving general radiative transfer problems, based on reverse ray-tracing combined with tree-based accelerated integration. We implement TREERAY in the adaptive mesh refinement code flash, as a module of the tree solver developed by Wunsch et al. However, the method itself is independent of the host code and can be implemented in any grid-based or particle-based hydrodynamics code. A key advantage of TREERAY is that its computational cost is independent of the number of sources, making it suitable for simulations with many point sources (e.g. massive star clusters) as well as simulations where diffuse emission is important. A very efficient communication and tree-walk strategy enable TREERAY to achieve almost ideal parallel scalings. TREERAY can easily be extended with sub-modules to treat radiative transfer at different wavelengths and to implement related physical processes. Here, we focus on ionizing radiation and use the on-the-spot approximation to test the method and its parameters. The ability to set the tree solver time-step independently enables the speedy calculation of radiative transfer in a multiphase ISM, where the hydrodynamic time-step is typically limited by the sound speed of the hot gas produced in stellar wind bubbles or supernova remnants. We show that complicated simulations of star clusters with feedback from multiple massive stars become feasible with TREERAY.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wuensch, Richard UNSPECIFIED UNSPECIFIED UNSPECIFIED Walch, Stefanie UNSPECIFIED orcid.org/0000-0001-6941-7638 UNSPECIFIED Dinnbier, Frantisek UNSPECIFIED UNSPECIFIED UNSPECIFIED Seifried, Daniel UNSPECIFIED UNSPECIFIED UNSPECIFIED Haid, Sebastian UNSPECIFIED orcid.org/0000-0001-7541-4935 UNSPECIFIED Klepitko, Andre UNSPECIFIED UNSPECIFIED UNSPECIFIED Whitworth, Anthony P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Palous, Jan UNSPECIFIED orcid.org/0000-0001-6729-2851 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-588535
DOI:	10.1093/mnras/stab1482
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	505
Number:	3
Page Range:	S. 3730 - 3755
Date:	2021
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language TRIGGERED STAR-FORMATION; MOLECULAR CLOUDS; INTERSTELLAR CLOUDS; IONIZING-RADIATION; COMPARISON PROJECT; COMETARY GLOBULES; DRIVEN IMPLOSION; STELLAR WINDS; SILCC PROJECT; HYDRODYNAMICS Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/58853