Spatial decomposition of structured grids for nuclear reactor simulations

被引:5
作者
Fitzgerald, Andrew P. [1 ]
Kochunas, Brendan [1 ]
Stimpson, Shane [2 ]
Downar, Thomas [1 ]
机构
[1] Univ Michigan, Dept Nucl Engn & Radiol Sci, 2200 Bonisteel Blvd,Floor 4, Ann Arbor, MI 48109 USA
[2] Oak Ridge Natl Lab, Reactor & Nucl Syst Div, 1 Bethel Valley Rd, Oak Ridge, TN 37830 USA
关键词
Spatial decomposition; Graphs; Nuclear reactor; Neutronics; Transport; 2D/1D METHOD;
D O I
10.1016/j.anucene.2019.06.054
中图分类号
TL [原子能技术]; O571 [原子核物理学];
学科分类号
0827 ; 082701 ;
摘要
Spatial decomposition methods based on graph partitioning are developed and implemented in the high fidelity neutron transport code MPACT. These graph-based spatial decomposition methods are more general than previous decomposition methods and typically provide better load balance and reduced run-times due to their improved parallel efficiency. Correlations are drawn between simulation runtime and the balance of the partition for 2D simulations. Comparisons are made using partition balance metrics for different decomposition schemes in 2D and 3D simulations. For typical ranges of subdomains, graph-based partitioning methods offer significant reductions to runtimes. However, for highly decomposed problems, these graph-based methods may decrease convergence rates, thus reducing parallel efficiency compared to older methods. (C) 2019 Elsevier Ltd. All rights reserved.
引用
收藏
页码:686 / 701
页数:16
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