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Radiation-hydrodynamics with MPI-AMRVAC . Flux-limited diffusion

Abstract : Context. Radiation controls the dynamics and energetics of many astrophysical environments. To capture the coupling between the radiation and matter, however, is often a physically complex and computationally expensive endeavor.
Aims: We sought to develop a numerical tool to perform radiation-hydrodynamics simulations in various configurations at an affordable cost.
Methods: We built upon the finite volume code MPI-AMRVAC to solve the equations of hydrodynamics on multi-dimensional adaptive meshes and introduce a new module to handle the coupling with radiation. A non-equilibrium, flux-limiting diffusion approximation was used to close the radiation momentum and energy equations. The time-dependent radiation energy equation was then solved within a flexible framework, fully accounting for radiation forces and work terms and further allowing the user to adopt a variety of descriptions for the radiation-matter interaction terms ("opacities").
Results: We validated the radiation module on a set of standard test cases for which different terms of the radiative energy equation predominate. As a preliminary application to a scientific case, we calculated spherically symmetric models of the radiation-driven and optically thick supersonic outflows from massive Wolf-Rayet stars. This also demonstrates our code's flexibility, as the illustrated simulation combines opacities typically used in static stellar structure models with a parametrized form for the enhanced line-opacity expected in supersonic flows.
Conclusions: This new module provides a convenient and versatile tool for performing multi-dimensional and high-resolution radiative-hydrodynamics simulations in optically thick environments with the MPI-AMRVAC code. The code is ready to be used for a variety of astrophysical applications, where our first target is set to be multi-dimensional simulations of stellar outflows from Wolf-Rayet stars.
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https://hal-insu.archives-ouvertes.fr/insu-03705398
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Monday, June 27, 2022 - 9:48:58 AM
Last modification on : Friday, August 5, 2022 - 3:37:49 PM

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N. Moens, J. O. Sundqvist, I. El Mellah, L. Poniatowski, J. Teunissen, et al.. Radiation-hydrodynamics with MPI-AMRVAC . Flux-limited diffusion. Astronomy and Astrophysics - A&A, EDP Sciences, 2022, 657, ⟨10.1051/0004-6361/202141023⟩. ⟨insu-03705398⟩

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