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南华大学 核科学技术学院 衡阳 421001
Received:30 November 2016,
Revised:24 January 2017,
Published:10 April 2017
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Xuehui LI, Zijing LIU, Jinsen XIE, et al. Geometry preprocessing methods research of MOC[J]. Nuclear techniques, 2017, 40(4): 040603
Xuehui LI, Zijing LIU, Jinsen XIE, et al. Geometry preprocessing methods research of MOC[J]. Nuclear techniques, 2017, 40(4): 040603 DOI: 10.11889/j.0253-3219.2017.hjs.40.040603.
网格划分、特征线间距、角度求积组、极角数目和方位角大小等几何预处理过程对特征线法的计算精度和计算效率有较大影响。基于步特征线法开发输运程序,通过数值计算验证所开发程序的正确性并分析两种特征线扫描方法(首尾相间循环扫描法、首尾相接循环扫描法)以及网格划分、特征线间距、角度求积组、极角数目、方位角大小对计算精度的影响。结果表明,开发的程序准确可靠;首尾相间循环扫描方法的收敛速度比首尾相接循环扫描方法慢。
Background
2
Geometry preprocessing
such as mesh division
between the characteristic line
polar angle quadrature set
the number of polar and azimuth angles and so on
has a great impact on computational accuracy and efficiency of the method of characteristics (MOC).
Purpose
2
This paper based on step characteristics method (SC) has developed a neutron transport calculation code.
Methods
2
Through numerical calculations
it has been verified the correctness of the program and has analyzed and compared two characteristic line scan method (fore and aft disconnect loop scanning method
the head-tail circulation scanning method). In addition
based on head-tail circulation scanning method
conducted a series of sensitivity analysis of the calculation accuracy about mesh division
between the characteristic line
polar angle quadrature set
the number of polar and azimuth angles.
Results
2
Program is accurate and reliable and the head-tail circulation scanning method has faster convergence rate than fore and aft disconnect loop scanning method.
Conclusions
2
Mesh division less than 2.5 cm can meet the calculation accuracy requirements and characteristic line spacing 0.1 cm and four azimuth has the highest calculation precision. More number of polar angle has higher calculation accuracy
two discrete polar angle has enough meet the accuracy requirements; the four arranged azimuth in the first quadrant should be laied out with two angles at both sides of 45·angle; Tabuchi and Yamamodo (TY) quadrature weighted have slightly higher calculation accuracy than Leonard (LO) quadrature set.
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