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dc.contributorParra, Oscar
dc.contributorZambrano, Joel
dc.contributorStehr, Alejandra
dc.creatorĐorđević, Dejana
dc.date.accessioned2021-03-09T10:28:25Z
dc.date.available2021-03-09T10:28:25Z
dc.date.issued2009
dc.identifier.isbn978-981-08-2099-2
dc.identifier.urihttps://grafar.grf.bg.ac.rs/handle/123456789/2296
dc.description.abstractThe paper addresses problems which arise from the use of 3D grids with quadrilateral faces on the horizontal planes in hydrodynamic modelling of discordant beds asymmetrical confluences with small junction angles. There are two sources of instabilities: a) steep gradients that develop near the backward facing step at the tributary entrance to the confluence and b) skewness of the cell faces on the horizontal planes. In previous studies of the concordant beds confluences the junction-angle of 45 was reported as the angle which still provides stable solution. In this paper, the limit value is redefined, and the minimal percentages of the post-confluence channel widening, necessary for obtaining stable solution, are defined for the set of small junction angles. Additionally, the practical consequences of artificial channel widening are discussed in detail. An attempt is made to reconstruct the profiles of the: a) minimal and maximal u-, v- and w- velocity values and b) non-dimensional bed shear stress for the case with no post-confluence channel widening.sr
dc.language.isoensr
dc.publisherUniversidad de Concepciónsr
dc.relationinfo:eu-repo/grantAgreement/MESTD/MPN2006-2010/22011/RS//sr
dc.relationinfo:eu-repo/grantAgreement/MESTD/MPN2006-2010/22017/RS//sr
dc.rightsrestrictedAccesssr
dc.sourceProceedings of the 8th International Conference on Hydroinformatics – HIC 2009sr
dc.subject3D grids with quadrilateral facessr
dc.subjectnumerical instabilitysr
dc.subjectbackward facing stepsr
dc.subjectskewness of the cell facessr
dc.subjectsmall junction anglesr
dc.subjectartificial post-confluence channel wideningsr
dc.titleNumerical stability problems in hydrodynamic modelling of confluences with small junction anglessr
dc.typeconferenceObjectsr
dc.rights.licenseARRsr
dc.rights.holderUniversidad de Concepciónsr
dc.citation.epage10
dc.citation.spage1/40
dc.identifier.rcubhttps://hdl.handle.net/21.15107/rcub_grafar_2296
dc.type.versionpublishedVersionsr


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