标题： 二维数值研究与实验室天体物理相关的辐射对激波结构的影响 显示英文标题

标题： 2D numerical study of the radiation influence on shock structure relevant to laboratory astrophysics

摘要： 辐射激波出现在各种天体物理物体中，特别是在恒星演化不同阶段。 因此，研究辐射激波的拓扑结构和热力学特性是理解其物理特性的起点。 随着大型激光设施的发展，这一研究成为可能，这为实验室天体物理学提供了新的动力。 我们介绍了使用圆柱模拟建模的辐射激波的主要特征。 我们将讨论的重点放在多维辐射传输效应对激波拓扑结构和动力学的重要性上。 我们展示了使用我们的代码HERACLES在已经于激光装置上进行的实验条件下获得的结果。 多维流体动力学代码HERACLES特别适用于实验室天体物理学实验以及辐射和流体力学相互耦合的天体物理情况。 强调了光子平均自由程与激波横向扩展之比的重要性。 我们介绍了如何在实验室中实现这些激波的稳态极限，并分析了可能从激波管壁中出现的辐射通量的角度分布。 提出了这些研究对恒星吸积激波的含义。 显示英文摘要

摘要： Radiative shocks are found in various astrophysical objects and particularly at different stages of stellar evolution. Studying radiative shocks, their topology, and thermodynamical properties is therefore a starting point to understanding their physical properties. This study has become possible with the development of large laser facilities, which has provided fresh impulse to laboratory astrophysics. We present the main characteristics of radiative shocks modeled using cylindrical simulations. We focus our discussion on the importance of multi-dimensional radiative-transfer effects on the shock topology and dynamics. We present results obtained with our code HERACLES for conditions corresponding to experiments already performed on laser installations. The multi-dimensional hydrodynamic code HERACLES is specially adapted to laboratory astrophysics experiments and to astrophysical situations where radiation and hydrodynamics are coupled. The importance of the ratio of the photon mean free path to the transverse extension of the shock is emphasized. We present how it is possible to achieve the stationary limit of these shocks in the laboratory and analyze the angular distribution of the radiative flux that may emerge from the walls of the shock tube. Implications of these studies for stellar accretion shocks are presented.