惯性约束聚变内爆中基于多块结构网格的高效辐射扩散并行算法

针对三维球形靶丸内爆高效模拟需求和传统笛卡尔正交网格上辐射加源困难的问题, 发展一种多块结构非正交网格生成方法, 并基于此种计算网格提出高效的三维扩散格式并行算法, 将其应用于辐射流体方程组的求解和三维内爆不对称性的数值模拟, 数值结果显示了算法的有效性。并行性能测试显示该算法可扩展到5400个核上, 并行效率达到69%。

An Efficient Parallel Algorithm on Multi-block Structure Meshes for Radiation Diffusion in Inertial Confinement Fusion Implosion

For high efficiency simulation of three-dimensional spherical implosion and the difficulty of adding radiation source on traditional Cartesian orthogonal grid, a multi-block non-orthogonal mesh generation method is developed. An efficient parallel algorithm of three-dimensional diffusion scheme on these meshes is proposed. It was applied to the simulation of radiation hydrodynamic equations and the asymmetry study in three-dimensional implosion problems. Effectiveness of the algorithm is shown. Scalability is demonstrated with a parallel efficiency above 69% on 5400 processors.