Assessment of RELAP5 matrix solvers for a two-phase natural circulation loop

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dc.contributor.authorBRAZ FILHO, FRANCISCO A.
dc.contributor.authorSABUNDJIAN, GAIANE
dc.contributor.authorRIBEIRO, GUILHERME B.
dc.contributor.authorCALDEIRA, ALEXANDRE D.
dc.coverageInternacionalpt_BR
dc.date.accessioned2017-10-04T17:07:54Z
dc.date.available2017-10-04T17:07:54Z
dc.date.issued2017pt_BR
dc.description.abstractThe 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.pt_BR
dc.format.extent249-258pt_BR
dc.identifier.citationBRAZ FILHO, FRANCISCO A.; SABUNDJIAN, GAIANE; RIBEIRO, GUILHERME B.; CALDEIRA, ALEXANDRE D. Assessment of RELAP5 matrix solvers for a two-phase natural circulation loop. <b>Annals of Nuclear Energy</b>, v. 105, p. 249-258, 2017. DOI: <a href="https://dx.doi.org/10.1016/j.anucene.2017.03.023">10.1016/j.anucene.2017.03.023</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/27827.
dc.identifier.doi10.1016/j.anucene.2017.03.023pt_BR
dc.identifier.issn0306-4549pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0001-9544-4509
dc.identifier.percentilfi86.36en
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/27827
dc.identifier.vol105pt_BR
dc.relation.ispartofAnnals of Nuclear Energypt_BR
dc.rightsopenAccesspt_BR
dc.subjectalgorithms
dc.subjectcomparative evaluations
dc.subjectcomputer codes
dc.subjectcoolants
dc.subjecthydrodynamics
dc.subjectiterative methods
dc.subjectmatrices
dc.subjectnatural convection
dc.subjectnuclear power
dc.subjectnuclear power plants
dc.subjectnucleate boiling
dc.subjectnucleate boiling
dc.subjectworking fluids
dc.titleAssessment of RELAP5 matrix solvers for a two-phase natural circulation looppt_BR
dc.typeArtigo de periódicopt_BR
dspace.entity.typePublication
ipen.autorGAIANE SABUNDJIAN
ipen.codigoautor202
ipen.contributor.ipenauthorGAIANE SABUNDJIAN
ipen.date.recebimento17-10pt_BR
ipen.identifier.fi1.476pt_BR
ipen.identifier.ipendoc23156pt_BR
ipen.identifier.iwosWoSpt_BR
ipen.range.fi0.001 - 1.499
ipen.range.percentilfi75.00 - 100.00
ipen.type.genreArtigo
relation.isAuthorOfPublication915b9343-9eaf-4b03-b709-85699f77b71c
relation.isAuthorOfPublication.latestForDiscovery915b9343-9eaf-4b03-b709-85699f77b71c
sigepi.autor.atividadeSABUNDJIAN, GAIANE:202:420:Npt_BR
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