基于权窗的全局减方差方法中“长历史”问题的研究与改进

张恒权; 李佳; 祝庆军; 吴玉潇; 聂星辰

doi:10.11889/j.0253-3219.2017.hjs.40.120602

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基于权窗的全局减方差方法中“长历史”问题的研究与改进

核能科学与工程 | 更新时间：2021-05-19

- 基于权窗的全局减方差方法中“长历史”问题的研究与改进
- A solution to "long history" in the method of GVR based on weight window
- 核技术 2017年40卷第12期文章编号：120602
- 作者机构：
  
  1.中国科学技术大学核科学技术学院合肥 230027
  2.中国科学院等离子体物理研究所合肥 230031
  3.广西防城港核电有限公司防城港 538000
- 作者简介：
  
  [ "张恒权, 男, 1995年出生, 目前就读于中国科学技术大学核科学技术学院攻读学士学位, 核工程与核技术专业", "ZHANG Hengquan, male, born in 1995, undergraduate, major in nuclear engineering and technology" ]
  李佳, E-mail:lijia@ustc.edu.cn LI Jia, E-mail:lijia@ustc.edu.cn
- 基金信息：
  
  中央高校基本科研业务费专项资金(WK2140000011)
- DOI：10.11889/j.0253-3219.2017.hjs.40.120602
  中图分类号： TL62
- 收稿日期：2017-05-05，
  
  修回日期：2017-06-30，
  
  纸质出版日期：2017-12-10
- 稿件说明：
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张恒权, 李佳, 祝庆军, 等. 基于权窗的全局减方差方法中“长历史”问题的研究与改进[J]. 核技术, 2017,40(12):120602

Hengquan ZHANG, Jia LI, Qingjun ZHU, et al. A solution to "long history" in the method of GVR based on weight window[J]. Nuclear techniques, 2017, 40(12): 120602
张恒权, 李佳, 祝庆军, 等. 基于权窗的全局减方差方法中“长历史”问题的研究与改进[J]. 核技术, 2017,40(12):120602 DOI： 10.11889/j.0253-3219.2017.hjs.40.120602.

Hengquan ZHANG, Jia LI, Qingjun ZHU, et al. A solution to "long history" in the method of GVR based on weight window[J]. Nuclear techniques, 2017, 40(12): 120602 DOI： 10.11889/j.0253-3219.2017.hjs.40.120602.

摘要

在具有全局特性的蒙特卡罗粒子输运计算中，常采用基于权窗的全局减方差方法，由此引起的"长历史"问题使计算效率大大降低。为了提高蒙特卡罗计算效率，减小计算资源的浪费，本文对"长历史"的成因及解决方案进行了研究。通过研究中国聚变工程试验反应堆（Chinese Fusion Engineering Testing Reactor，CFETR）中子输运计算中"长历史"的事件记录文件，提出了"长历史"的成因与粒子连续在轮盘赌中存活有关，针对此成因提出了通过粒子在轮盘赌中存活的次数来限制粒子分裂的解决方法，并通过CFETR模型对这个方法进行了测试。结果显示，次数限取1-4时，并行效率达到80%，无"长历史"出现，品质因子（pFoM

）达到不采用次数限时的约3倍。综上，采用这种方法可以有效克服"长历史"问题，使全局减方差方法的计算效率明显提升。

Abstract

Background

The "long history" induced by the method of global variance reduction (GVR) based on weight window would reduce the efficiency of the Monte Carlo particle transport calculation with global characteristic.

Purpose

To enhance the efficiency and minimize the waste of computing resource

this article proposes a solution to "long history" based on the study of its causes.

Methods

According to the event log of "long history" in Chinese fusion engineering testing reactor (CFETR) neutron transport calculation

the cause of the "long history" is brought up

which is in relation to particle's successively surviving in the Russian roulette games. A solution to the "long history" by limiting particle's splitting according to the number of surviving games (weight roulette number

WRN)

is came up with

which is tested in CFETR model.

Results

The result shows that when the limited number is between 1 and 4

the parallel efficiency reaches 80%

with no "long history" present and global figure of merit (pFoM

) being around 3 times of that in calculation without the limited number.

Conclusion

The solution proposed prevented the "long history" and thus greatly enhanced the efficiency of GVR.

关键词

Keywords

references

X-5 Monte Carlo Team. A general Monte Carlo N-particle transport code:user's guide[R]. Version 5. Vol.Ⅱ. USA:Los Alamos National Laboratory, 2003.

聂星辰 , 李佳 , 赵平辉 , . 蒙特卡罗模拟CFETR中子输运计算中的全局减方差方法应用及对比 . 核技术 , 2016 . 39 ( 3 ): 030501 DOI: 10.11889/j.0253-3219.2016.hjs.39.030501 http://doi.org/10.11889/j.0253-3219.2016.hjs.39.030501 http://www.j.sinap.ac.cn/hejishu/CN/abstract/abstract557.shtml .

Xingchen NIE , Jia LI , Pinghui ZHAO , . Application and comparison of global variance reduction methods employed in Monte Carlo neutron transport for CFETR . Nuclear Techniques , 2016 . 39 ( 3 ): 030501 DOI: 10.11889/j.0253-3219.2016.hjs.39.030501 http://doi.org/10.11889/j.0253-3219.2016.hjs.39.030501 http://www.j.sinap.ac.cn/hejishu/CN/abstract/abstract557.shtml .

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A Davis , A Turner . Comparison of global variance reduction techniques for Monte Carlo radiation transport simulations of ITER . Fusion Engineering and Design , 2011 . 86 2698 - 2700 . DOI: 10.1016/j.fusengdes.2011.01.059 http://doi.org/10.1016/j.fusengdes.2011.01.059 .

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聂星辰 , 李佳 , 赵平辉 , . 深穿透屏蔽计算中MCNP减方差技巧应用及比较 . 核电子学与探测技术 , 2016 . 36 ( 7 ): 729 - 733, 741 . DOI: 10.3969/j.issn.0258-0934.2016.07.016 http://doi.org/10.3969/j.issn.0258-0934.2016.07.016 .

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