Počet záznamů: 1
Scalable matrix-free solver for 3D transfer of polarized radiation in stellar atmospheres
- 1.
SYSNO ASEP 0572595 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Scalable matrix-free solver for 3D transfer of polarized radiation in stellar atmospheres Tvůrce(i) Benedusi, P. (CH)
Riva, S. (IT)
Zulian, P. (CH)
Štěpán, Jiří (ASU-R) RID, ORCID
Belluzzi, L. (ES)
Krause, R. (IT)Celkový počet autorů 6 Číslo článku 112013 Zdroj.dok. Journal of Computational Physics. - : Elsevier - ISSN 0021-9991
Roč. 479, April (2023)Poč.str. 18 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova radiative transfer ; polarization ; scattering Vědní obor RIV BN - Astronomie a nebeská mechanika, astrofyzika Obor OECD Astronomy (including astrophysics,space science) CEP GA19-20632S GA ČR - Grantová agentura ČR Způsob publikování Open access Institucionální podpora ASU-R - RVO:67985815 UT WOS 000991844500001 EID SCOPUS 85148961085 DOI 10.1016/j.jcp.2023.112013 Anotace We present an efficient and massively parallel solution strategy for the transfer problem of polarized radiation, for a 3D stationary medium out of local thermodynamic equilibrium. Scattering processes are included accounting for partial frequency redistribution effects. Such a setting is one of the most challenging ones in radiative transfer modeling. The problem is formulated for a two-level atomic model, which allows linearization. The discrete ordinate method alongside an exponential integrator are used for discretization. Efficient solution is obtained with a Krylov method equipped with a tailored physics-based preconditioner. A matrix-free approach results in a lightweight implementation, suited for tackling large problems. Near-optimal strong and weak scalability are obtained with two complementary decompositions of the computational domain. The presented approach made it possible to perform simulations for the Ca I line at 4227 angstrom with more than 109 degrees of freedom in less than half an hour on massively parallel machines, always converging in a few iterations for the proposed tests. (c) 2023 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons .org /licenses /by /4 .0/). Pracoviště Astronomický ústav Kontakt Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Rok sběru 2024 Elektronická adresa https://hdl.handle.net/11104/0343834
Počet záznamů: 1