Assessment of RELAP5 matrix solvers for a two-phase natural circulation loop
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Annals of Nuclear Energy
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The heat transfer mechanism of natural convection has been extensively studied as a passive heat
removal system of new nuclear power plants. Considering this aspect, the main objective of this study
is to present an assessment of RELAP5 linear-equation solver under a transient two-fluid model for a
two-phase natural circulation loop (NCL). For this assessment, three different approaches of linearequation
solvers for the hydrodynamic model are presented: the sparse matrix solver based on the
Lower-Upper (LU) decomposition, the Border-Profile Lower Upper (BPLU) solver and the iterative method
named Generalized Minimal Residual Method (GMRES). For comparison purposes, an experimental natural
circulation loop made of glass tubes and using water as working fluid is analyzed. The onset of nucleate
boiling observed during the experiment was predicted by all RELAP5 solvers as well as the
representation of flow oscillations along the loop. Furthermore, it was noticed that the choice of the solver
algorithm has a strong influence on the prediction of the two-phase natural circulation phenomena,
since different wavelengths and amplitudes of flow instabilities were obtained for each approach.
Como referenciar
BRAZ FILHO, FRANCISCO A.; SABUNDJIAN, GAIANE; RIBEIRO, GUILHERME B.; CALDEIRA, ALEXANDRE D. Assessment of RELAP5 matrix solvers for a two-phase natural circulation loop. Annals of Nuclear Energy, v. 105, p. 249-258, 2017. DOI: 10.1016/j.anucene.2017.03.023. Disponível em: http://repositorio.ipen.br/handle/123456789/27827. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.