SPRAI-II: multifrequency radiative transfer for variable gas densities
We present version 2 of the radiation transfer module sprai (Simplex Photon Radiation in the arepo Implementation). sprai is a novel method for solving the equations of transfer on an unstructured mesh using a variant of the short characteristics approach. It has several advantages compared to other...
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| Hauptverfasser: | , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
07 October 2020
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2020, Jahrgang: 499, Heft: 3, Pages: 3594-3609 |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/staa3054 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1093/mnras/staa3054
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| Verfasserangaben: | Ondrej Jaura, Mattis Magg, Simon C.O. Glover and Ralf S. Klessen |
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| 520 | |a We present version 2 of the radiation transfer module sprai (Simplex Photon Radiation in the arepo Implementation). sprai is a novel method for solving the equations of transfer on an unstructured mesh using a variant of the short characteristics approach. It has several advantages compared to other approaches: its computational cost is independent of the number of radiation sources (unlike typical ray-tracing methods) and it is less diffusive than moment-based methods. Version 1 of sprai has already been shown to do an excellent job of modelling the growth of R-type ionization fronts in low-density gas. However, it does not perform so well with D-type fronts in denser gas unless run with a small time-step. Version 2 of the code addresses this weakness in the algorithm, allowing us to dramatically improve its performance in dense gas. Version 2 of sprai also includes two important updates to the microphysics treated in the code: a revised multifrequency framework that allows us to model helium photoionization, and a treatment of the effects of radiation pressure. In this paper, we describe these enhancements to sprai and also present several tests of the code. | ||
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