Spatial decomposition of structured grids for nuclear reactor simulations
| Autor: | Andrew Fitzgerald, Shane Stimpson, Brendan Kochunas, Thomas J. Downar |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Neutron transport
Computer science 020209 energy Graph partition 02 engineering and technology Nuclear reactor 01 natural sciences Partition (database) 010305 fluids & plasmas Computational science law.invention High fidelity Nuclear Energy and Engineering law 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Graph (abstract data type) |
| Zdroj: | Annals of Nuclear Energy. 132:686-701 |
| ISSN: | 0306-4549 |
| Popis: | 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 runtimes 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. |
| Databáze: | OpenAIRE |
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