ORIGINAL RESEARCH article
Front. Energy Res.
Sec. Nuclear Energy
Octant Overlapping and Angle-energy Group Expanded KBA Parallelism of Three-dimensional Discrete Ordinate Method
Provisionally accepted
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences (CAS), Shanghai, China
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To enhance the parallel efficiency of the conventional KBA spatial decomposition method, this study incorporates octant overlapping and angle-energy group expansion into the source iteration scheme for solving the discrete ordinate equations. The performance of various KBA-based methods is then theoretically analyzed in terms of parallel efficiency and speedup ratio. Finally, the influence of different data structures on CPU cache hit ratio and calculation time is tested through three-dimensional benchmark problems. The results demonstrate that the source iteration method incorporating octant overlapping and angle-group expansion exhibits superior parallel characteristics. This enhancement can elevate the parallel efficiency of KBA for prevalent problems to over 97%. The impact of data structures on the cache hit ratio and calculation time is substantial. Furthermore, organizing data according to its access order is shown to significantly improve the cache hit rate. The findings of the three-dimensional benchmark problem demonstrate that the octant overlapping and angle-energy group expanding parallel method proposed in this paper exhibits a higher speedup ratio. This method aligns closely with the theoretical analysis results and can be employed for fine-grained, large-scale parallel computing and analysis.
Keywords: Discrete ordinate, Space decomposition, Angle and Energy Group Parallelism, Koch-Baker-Alcouffe Method, Parallel computing of neutron transport simulation
Received: 07 Jul 2025; Accepted: 20 Nov 2025.
Copyright: © 2025 GUO, ZOU, ZHAO and YAN. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Jian GUO, guojian@sinap.ac.cn
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