Development of a new Lagrangian vortex method for evaluating effects of surfaces roughness

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dc.contributor.authorBimbato, A. M. [UNESP]
dc.contributor.authorAlcântara Pereira, L. A.
dc.contributor.authorHirata, M. H.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionFederal University of Itajubá (UNIFEI)
dc.contributor.institutionUniversidade do Estado do Rio de Janeiro (UERJ)
dc.date.accessioned2019-10-06T15:18:59Z
dc.date.available2019-10-06T15:18:59Z
dc.date.issued2019-03-01
dc.description.abstractThe main contribution of this paper is to develop a new methodology to include effects of surface roughness on aerodynamic of bodies. The numerical approach simulates the mechanism of vortex shedding of a rough circular cylinder in the subcritical flow regime (Re=105) using a mesh-free vortex method. The local turbulence effects are considered during the vorticity diffusion process; as consequence a connection between the larger scales and the smaller ones is made by eddy viscosity. The eddy viscosity computation is necessary for each Lamb vortex element that constructs the Kármán vortex street; it is also the way employed to make feasible the purposed surface roughness model. Simultaneous measurements of the spanwise-integrated unsteady aerodynamic forces and time averaged local surface pressures on a two-dimensional rough circular cylinder are investigated aiming to reach supercritical Reynolds number flow patterns from subcritical flows. It is shown that the surface roughness model captures successfully the drag crisis in a qualitative way.en
dc.description.affiliationDepartment of Energy São Paulo State University (UNESP)
dc.description.affiliationMechanical Engineering Institute Federal University of Itajubá (UNIFEI)
dc.description.affiliationState University of Rio de Janeiro (FAT-UERJ)
dc.description.affiliationUnespDepartment of Energy São Paulo State University (UNESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdCNPq: 142804/2008-8
dc.format.extent291-301
dc.identifierhttp://dx.doi.org/10.1016/j.euromechflu.2018.09.001
dc.identifier.citationEuropean Journal of Mechanics, B/Fluids, v. 74, p. 291-301.
dc.identifier.doi10.1016/j.euromechflu.2018.09.001
dc.identifier.issn0997-7546
dc.identifier.scopus2-s2.0-85053829524
dc.identifier.urihttp://hdl.handle.net/11449/186893
dc.language.isoeng
dc.relation.ispartofEuropean Journal of Mechanics, B/Fluids
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectAerodynamics of bluff body
dc.subjectDrag crisis
dc.subjectLagrangian vortex method
dc.subjectSurface roughness model
dc.titleDevelopment of a new Lagrangian vortex method for evaluating effects of surfaces roughnessen
dc.typeArtigo
unesp.author.lattes9281176919261064[1]
unesp.author.orcid0000-0002-6777-4516[1]

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