Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (4): 40603-040603.doi: 10.11889/j.0253-3219.2017.hjs.40.040603

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Geometry preprocessing methods research of MOC

LI Xuehui, LIU Zijing, XIE Jinsen, YU Tao, CHEN Zhenping, XIE Qin, ZENG Wenjie, HE Lihua   

  1. School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
  • Received:2016-11-30 Revised:2017-01-24 Online:2017-04-10 Published:2017-04-07
  • Supported by:

    Supported by National Natural Science Foundation of China (No.11305088), Research Foundation of Education Bureau of Hunan Province (No.16C1365) First author: LI Xuehui, male, born in1990, graduated from University of South China in 2014, master student, focusing on reactor physics

Abstract:

Background: 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: This paper based on step characteristics method (SC) has developed a neutron transport calculation code. Methods: 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: Program is accurate and reliable and the head-tail circulation scanning method has faster convergence rate than fore and aft disconnect loop scanning method. Conclusion: 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.

Key words: MOC, Geometry preprocessing, Circulation characteristic line scan

CLC Number: 

  • TL329