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Contribution à l'étude numérique de l'hydrodynamique radiative : des expériences de chocs radiatifs aux jets astrophysiques

Abstract : Radiation-hydrodynamics deals with the dynamical interaction between gas and radiation. Its applications lie from astrophysics to inertial confinement fusion.

During this thesis, a 3D parallel radiation-hydrodynamics code called HERACLES has been developed. It relies upon the M1 model which can deal with anisotropic radiation field. Various tests have validated HERACLES upon a large variety of physical conditions, including semi-transparent regime and photon diffusion, its results being similar to those of Monte-Carlo codes. It has then been applied to two domains.

The first one dealt with radiative shocks, astrophysical phenomena reproduced on Earth thanks to high-power lasers. HERACLES has shown the influence of different parameters upon the radiative shock evolution: ratio propagation canal width over photon mean free path, walls albedo... Then, it has contributed to analyze an experiment conducted at the PALS laser facility. It has reproduced the observed precursor slowdown and the transmission of the transverse diagnostic.

The second domain dealt with the jets generated by forming stars and interacting with their ambient molecular cloud. Since the interstellar medium opacities imply that a significant part of radiation is absorbed, we conducted the first jets simulations including radiation-hydrodynamics. They showed that the jets can be highly compressed and that radiative transfer could then play an important role in the jets propagation.
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https://tel.archives-ouvertes.fr/tel-00110290
Contributor : Matthias Gonzalez <>
Submitted on : Friday, October 27, 2006 - 11:45:54 AM
Last modification on : Friday, April 10, 2020 - 5:23:52 PM
Long-term archiving on: : Tuesday, April 6, 2010 - 9:10:37 PM

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  • HAL Id : tel-00110290, version 1

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Matthias Gonzalez. Contribution à l'étude numérique de l'hydrodynamique radiative : des expériences de chocs radiatifs aux jets astrophysiques. Astrophysique [astro-ph]. Université Paris Sud - Paris XI, 2006. Français. ⟨tel-00110290⟩

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