(Institute of Applied Physics and Computational Mathematics, Beijing 100094, China)
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摘要: 为满足分层掺杂点火内爆靶辐射驱动不对称性全过程物理分析的需求，在激光聚变二维总体程序LARED集成上发展了辐射输运建模下的多介质ALE方法-RTALE(Radiative Transfer Arbitrary-Lagrangian-Eulerian)。为提高多介质ALE方法的健壮性，发展了驰豫网格重构算法，该重构算法生成的新网格能自适应流场的变化。数值模拟了激波与气柱相互作用的RM不稳定性实验，模拟的气泡变形程度与试验结果基本一致，其中驰豫网格重构算法中的驰豫因子能够很好地反映流场密度梯度。基于辐射多群输运建模的LARED集成程序能够完整模拟辐射驱动不对称性条件下掺杂点火靶二维内爆过程，克服了传统ALE方法计算不下去和算不好的困难，界面变形程度也符合物理分析。Abstract: The LARED-Integration code is used for the numerical simulation of the indirect-drive Inertial Confined Fusion. In order to meet with the physics analysis on the whole ignition implosion process, a robust grid relaxation algorithm adaptive to the flow variation is developed for the multi-material arbitrary Lagrangian Eulerian method used in the LARED-Integration code. Compared with the experiment phenomena, the shape of the bubble in the RM instability numerical results is considerable，and the relaxation factor used in the grid relaxation algorithm shows the variation of the density variable. The 2-D implosion process of the multi-layer ignition capsule driven by radiation source is simulated. The whole physical process can be finished and the numerical results are satisfactory according to the physical analysis.
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