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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29713
Title: Non-LTE radiation hydrodynamics in PLUTO
Authors: COLOMBO , SALVATORE 
Ibgui, L.
ORLANDO, Salvatore 
Rodríguez, R.
Espinosa, G.
González, M.
Stehlé, C.
Peres, Giovanni 
Issue Date: 2019
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 631
First Page: A41
Abstract: Context. Modeling the dynamics of most astrophysical structures requires an adequate description of the interaction of radiation and matter. Several numerical (magneto-) hydrodynamics codes were upgraded with a radiation module to fulfill this request. However, those that used either the flux-limited diffusion (FLD) or the M1 radiation moment approaches are restricted to local thermodynamic equilibrium (LTE). This assumption may not be valid in some astrophysical cases. <BR /> Aims: We present an upgraded version of the LTE radiation-hydrodynamics (RHD) module implemented in the PLUTO code, which we have extended to handle non-LTE regimes. <BR /> Methods: Starting from the general frequency-integrated comoving-frame equations of RHD, we have justified all the assumptions that were made to obtain the non-LTE equations that are implemented in the module under the FLD approximation. An operator-split method with two substeps was employed: the hydrodynamics part was solved with an explicit method by the solvers that are currently available in PLUTO, and the non-LTE radiation diffusion and energy exchange part was solved with an implicit method. The module was implemented in the PLUTO environment. It uses databases of radiative quantities that can be provided independently by the user: the radiative power loss, and the Planck and Rosseland mean opacities. In our case, these quantities were determined from a collisional-radiative steady-state model, and they are tabulated as functions of temperature and density. <BR /> Results: Our implementation has been validated through different tests, in particular, radiative shock tests. The agreement with the semi-analytical solutions (when available) is good, with a maximum error of 7%. Moreover, we have proved that a non-LTE approach is of paramount importance to properly model accretion shock structures. Conclusion. Our radiation FLD module represents a step toward a general non-LTE RHD modeling. <P />The module is available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr/">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/631/A41">http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/631/A41</A> and upon request to the first author.
URI: http://hdl.handle.net/20.500.12386/29713
URL: https://www.aanda.org/articles/aa/full_html/2019/11/aa35991-19/aa35991-19.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201935991
Bibcode ADS: 2019A&A...631A..41C
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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