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dc.contributor.authorCunha, Augusto Hugo Farias dapt_BR
dc.contributor.authorFragoso Júnior, Carlos Rubertopt_BR
dc.contributor.authorChalegre, Cayo Lopes Bezerrapt_BR
dc.contributor.authorMarques, David Manuel Lelinho da Mottapt_BR
dc.date.accessioned2020-11-11T04:13:33Zpt_BR
dc.date.issued2020pt_BR
dc.identifier.issn2073-4441pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/214980pt_BR
dc.description.abstractHydrodynamic models based on the RANS equation are well-established tools to simulate three-dimensional free surface flows in large aquatic ecosystems. However, when the ratio of vertical to horizontal motion scales is not small, a non-hydrostatic approximation is needed to represent these processes accurately. Increasing efforts have been made to improve the efficiency of non-hydrostatic hydrodynamic models, but these improvements require higher implementation and computational costs. In this paper, we proposed a novel free-surface boundary condition based on a fictional sublayer at the free-surface (FSFS). We applied the FSFS approach at a finite difference numerical discretization with a fractional step framework, which uses a Neumann type of boundary condition to apply a hydrostatic relation in the top layer. To evaluate the model performance, we compared the Classic Boundary Condition Approach (CBA) and the FSFS approach using two numerical experiments. The experiments tested the model’s phase error, capability in solving wave celerity and simulate non-linear wave propagation under different vertical resolution scenarios. Our results showed that the FSFS approach had a lower phase error (2 to 5 times smaller) than CBA with a little additional computational cost (ca. 7% higher). Moreover, it can better represent wave celerity and frequency dispersion with 2 times fewer layers and low mean computational cost (CBA δt = 2.62 s and FSFS δt = 1.22 s).en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofWater. Basel. Vol. 12, no. 5 (May 2020), [Article] 1271, 17 p.pt_BR
dc.rightsOpen Accessen
dc.subjectModelos hidrodinâmicospt_BR
dc.subjectNon-hydrostatic pressureen
dc.subjectImplementations costen
dc.subjectEcossistemas aquáticospt_BR
dc.subjectComputational costen
dc.subjectPropagação de ondaspt_BR
dc.subjectSimulação numéricapt_BR
dc.subjectDinâmica dos fluidos computacionalpt_BR
dc.subjectPressão hidrostáticapt_BR
dc.titleImprovement of non-hydrostatic hydrodynamic solution using a novel free-surface boundary conditionpt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001118327pt_BR
dc.type.originEstrangeiropt_BR


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