神光Ⅱ装置上靶丸压缩实验中, 黑腔长度的变化会影响靶丸赤道和两极受到的辐照强度, 从而导致燃料区被压缩成不同的形状。介绍了辐射多群扩散建模下的辐射流体力学方程组及其数值方法。采用最近研制的二维总体LARED集成程序, 对神光Ⅱ不同长度黑腔靶丸压缩变形实验进行了整体数值模拟。结果表明辐射多群扩散建模可以反映腔内辐照均匀性变化情况, 靶丸压缩形状与神光Ⅱ实验定性一致。

In capsule compression experiments on SG-Ⅱ facility, the variation of the hohlraum length affects the radiant intensity of the capsule equator and poles, thus the fuel is compressed to different shapes. We introduced the radiation hydrodynamics equations and numerical methods used in radiation multi-group diffusion modeling. Using the recently developed two-dimensional LARED-integration code, we accomplished the integrated simulation of compression distortion experiments of SG-Ⅱ hohlraums with different lengths in radiation multi-group diffusion approximation. The shapes of fuel simulated agree well with those in the SG-Ⅱ experiments, which shows that the radiation multi-group diffusion approximation could reflect the radiation uniformity in the hohlraum.