Control and suppression of vortex shedding from a slightly rough circular cylinder by a discrete vortex method

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dc.contributor.authorDe Oliveira, Marcos André
dc.contributor.authorDe Moraes, Paulo Guimarães
dc.contributor.authorDe Andrade, Crystianne Lilian
dc.contributor.authorBimbato, Alex Mendonça [UNESP]
dc.contributor.authorPereira, Luiz Antonio Alcântara
dc.contributor.institutionFederal University of Itajubá (UNIFEI)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2020-12-12T01:38:13Z
dc.date.available2020-12-12T01:38:13Z
dc.date.issued2020-09-01
dc.description.abstractA discrete vortex method is implemented with a hybrid control technique of vortex shedding to solve the problem of the two-dimensional flow past a slightly rough circular cylinder in the vicinity of a moving wall. In the present approach, the passive control technique is inspired on the fundamental principle of surface roughness, promoting modifications on the cylinder geometry to affect the vortex shedding formation. A relative roughness size of ϵ∗/d∗= 0.001 (ϵ∗is the average roughness and d∗is the outer cylinder diameter) is chosen for the test cases. On the other hand, the active control technique uses a wall plane, which runs at the same speed as the free stream velocity to contribute with external energy affecting the fluid flow. The gap-to-diameter varies in the range from h∗/d∗= 0.05 to 0.80 (h∗is the gap between the moving wall and the cylinder bottom). A detailed account of the time history of pressure distributions, simultaneously investigated with the time evolution of forces, Strouhal number behavior, and boundary layer separation are reported at upper-subcritical Reynolds number flows of Re = 1.0 × 105. The saturation state of the numerical simulations is demonstrated through the analysis of the Strouhal number behavior obtained from temporal history of the aerodynamic loads. The present work provides an improvement in the prediction of Strouhal number than other studies no using roughness model. The aerodynamic characteristics of the cylinder, as well as the control of intermittence and complete interruption of von Kármán-type vortex shedding have been better clarified.en
dc.description.affiliationMechanical Engineering Institute Federal University of Itajubá (UNIFEI)
dc.description.affiliationSchool of Engineering São Paulo State University (UNESP)
dc.description.affiliationUnespSchool of Engineering São Paulo State University (UNESP)
dc.identifierhttp://dx.doi.org/10.3390/en13174481
dc.identifier.citationEnergies, v. 13, n. 17, 2020.
dc.identifier.doi10.3390/en13174481
dc.identifier.issn1996-1073
dc.identifier.scopus2-s2.0-85090702216
dc.identifier.urihttp://hdl.handle.net/11449/199379
dc.language.isoeng
dc.relation.ispartofEnergies
dc.sourceScopus
dc.subjectBluff body
dc.subjectLagrangian description
dc.subjectRoughness model
dc.subjectSuppression hybrid control
dc.subjectVenturi effect
dc.titleControl and suppression of vortex shedding from a slightly rough circular cylinder by a discrete vortex methoden
dc.typeArtigo

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