计算物理 ›› 2010, Vol. 27 ›› Issue (5): 722-732.

• 研究论文 • 上一篇    下一篇

蒙特卡罗粒子输运问题的全局降方差方法

许海燕, 黄正丰, 蔡少辉   

  1. 北京应用物理与计算数学研究所, 北京 100094
  • 收稿日期:2009-07-02 修回日期:2010-01-13 出版日期:2010-09-25 发布日期:2010-09-25
  • 作者简介:许海燕(1969-),女,山东聊城,研究员,硕士,从事蒙特卡罗粒子输运问题的应用研究,北京市海淀区丰豪东路2号100094.
  • 基金资助:
    中国工程物理研究院科学技术面上基金(20060649)资助项目

Global Variance Reduction Method for Monte Carlo Particle Transport Problemes

XU Haiyan, HUANG Zhengfeng, CAI Shaohui   

  1. Institute of Applied Physics and Computational Mathematics, Beijing 100094, China
  • Received:2009-07-02 Revised:2010-01-13 Online:2010-09-25 Published:2010-09-25

摘要: 精确获得中子通量的时间-空间-能量精细分布对于一类非定常粒子输运蒙特卡罗模拟至关重要.以零方差理论为基础,采取化整为零的策略,把蒙特卡罗方法与离散纵标方法相耦合,用近似重要函数指导蒙特卡罗模拟,给出一种实现蒙特卡罗全局降方差的计算方案.数值算例表明,该计算方案获得了全局降方差的效果.

关键词: 蒙特卡罗方法, 粒子输运, 离散纵标方法, 伴随计算, 全局降方差

Abstract: A global variance reduction method is described.The method is based on a modified transport problem that can be solved by analog Monte Carlo with zero variance.It is developed by breaking up the whole into parts and coupling Monte Carlo method with discrete ordinates method and using approximate importance function to guide Monte Carlo simulation.Performance of the method for a one-dimensional sphere transport problem is demonstrated.The method is shown to produce lower variances globally compared to analog Monte Carlo.

Key words: Monte Carlo method, particle transport, discrete ordinate method, adjoint calculation, global variance reduction

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