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  AREPO-MCRT: Monte Carlo radiation hydrodynamics on a moving mesh

Smith, A., Kannan, R., Tsang, B.-T.-H., Vogelsberger, M., & Pakmor, R. (2020). AREPO-MCRT: Monte Carlo radiation hydrodynamics on a moving mesh. The Astrophysical Journal, 905(1): 27. doi:10.3847/1538-4357/abc47e.

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AREPO-MCRT Monte Carlo Radiation Hydrodynamics on a Moving Mesh.pdf (Any fulltext), 3MB
 
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 Creators:
Smith, Aaron, Author
Kannan, Rahul, Author
Tsang, Benny T.-H., Author
Vogelsberger, Mark, Author
Pakmor, Rüdiger1, Author              
Affiliations:
1Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              

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 Abstract: We present arepo-mcrt, a novel Monte Carlo radiative transfer radiation-hydrodynamics (RHD) solver for the unstructured moving-mesh code arepo. Our method is designed for general multiple scattering problems in both optically thin and thick conditions. We incorporate numerous efficiency improvements and noise reduction schemes to help overcome efficiency barriers that typically inhibit convergence. These include continuous absorption and energy deposition, photon weighting and luminosity boosting, local packet merging and splitting, path-based statistical estimators, conservative (face-centered) momentum coupling, adaptive convergence between time steps, implicit Monte Carlo algorithms for thermal emission, and discrete-diffusion Monte Carlo techniques for unresolved scattering, including a novel advection scheme. We primarily focus on the unique aspects of our implementation and discussions of the advantages and drawbacks of our methods in various astrophysical contexts. Finally, we consider several test applications including the levitation of an optically thick layer of gas by trapped infrared radiation. We find that the initial acceleration phase and revitalized second wind are connected via self-regulation of the RHD coupling, such that the RHD method accuracy and simulation resolution each leave important imprints on the long-term behavior of the gas.

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Language(s): eng - English
 Dates: 2020-12-09
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/1538-4357/abc47e
Other: LOCALID: 3283596
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 905 (1) Sequence Number: 27 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3