Full Multi-grid Diffusion Synthetic Accelerated Discrete-Ordinates Neutron Transport Numerical Computation Code SN3C
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摘要: 为提高已开发三维中子输运数值计算程序SN3C的效率,本文采用一致的扩散综合加速方法加速源迭代,并用Chebyshev加速方法提高幂迭代的收敛速度。针对扩散综合加速方法中求解扩散方程的特点,发展了基于完全多重网格方法的求解技术,数值试验的结果显示,SN3C的计算结果与Monte Carlo方法以及EVENT的计算结果符合很好;并且,对于中小规模的问题,完全多重网格方法的效率可与具有最优松弛因子的块超松弛方法相比;对于较大规模的问题,完全多重网格方法的性能更好。Abstract: To improve the performance of the recently developed three-dimensional neutron transport code SN3C,the consistent Diffusion Synthetic Acceleration（DSA） method and the self-adapting Chebyshev polynomial acceleration method were adopted to accelerate the source iteration and power iteration,respectively.According to the characteristics of the method used by the DSA for solving the diffusion equa-tion,the author had developed the Full Multi-grid Diffusion Synthetic Method（FMDSA）,which based on the Full Multi-grid Algorithm.The results of benchmark calculation showed a good agreement with reference value.The performance of FMDSA was demonstrated as good as the block-SOR with optimal relaxation fac-tor for little and medium problems,and moreover,for a large-scale problem,it was better than the latter.
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