Turbulent Shear Flow Downstream of a Sphere with and Without an O-Ring Located Over a Plane Boundary

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dc.contributor.authorÖzgören, Muammer
dc.contributor.authorOkbaz, Abdulkerim
dc.contributor.authorDoğan, Sercan
dc.contributor.authorŞahin, Beşir
dc.contributor.authorAkıllı, Hüseyin
dc.date.accessioned2020-03-26T18:32:01Z
dc.date.available2020-03-26T18:32:01Z
dc.date.issued2012
dc.departmentSelçuk Üniversitesien_US
dc.descriptionConference on Experimental Fluid Mechanics (EFM) -- NOV 22-25, 2011 -- Jicin, CZECH REPUBLICen_US
dc.description.abstractFlow-structure interaction of separated shear flow from the sphere and a flat plate was investigated by using dye visualization and the particle image velocimetry technique. Later, a passive control method was applied with 2mm o-ring located on the sphere surface at 55 degrees from front stagnation point. The experiments were carried out in open water channel for Reynolds number value of Re=5000. Flow characteristics have been examined in terms of the 2-D instantaneous and time-averaged velocity vectors, patterns of vorticity, streamlines, rms of velocity fluctuations and Reynolds stress variations and discussed from the point of flow physics, vortex formation, lengths of large-scale Karman Vortex Streets and Kelvin-Helmholtz vortices depending on the sphere locations over the flat plate. It is demonstrated that the gap flow occurring between the sphere bottom point and the flat plate surface has very high scouring effect until h/d=0.25 and then unsymmetrical flow structure of the wake region keeps up to h/D=1.0 for smooth sphere. For the sphere with o-ring, the wake flow structure becomes symmetrical at smaller gap ratios and reattachment point on the flat plate surface occurs earlier. Moreover, o-ring on the sphere diminishes peak magnitudes of the flow characteristics and thus it is expected that the flow-induced forces will be lessened both on the sphere and flat plate surface. Vortex formation lengths and maximum value occurring points become closer locations to the rear surface of the sphere with o-ring.en_US
dc.description.sponsorshipDantec Dynamics GmbH, Nykryn CZ, Honeywell, spol, Metrostav, Telemeter Elect, TOPTEC/IPP CAS, TSI GmbH, Warmnis spol s r oen_US
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [109R028]; Coordinatorship of Selcuk University's Scientific Resear; Scientific Research Projects Office of Cukurova UniversityCukurova University [AAP20025]en_US
dc.description.sponsorshipThe authors would like to acknowledge the funding of the Scientific and Technological Research Council of Turkey (TUBITAK) under contract no:109R028, Coordinatorship of Selcuk University's Scientific Research and Scientific Research Projects Office of Cukurova University under contract No: AAP20025. This study is prepared from Master of Science Thesis of Abdulkerim OKBAZ.en_US
dc.identifier.citationÖzgören, M., Okbaz, A., Doğan, S., Şahin, B., Akıllı, H., (2012). Turbulent Shear Flow Downstream of a Sphere with and Without an O-Ring Located Over a Plane Boundary. Experimental Fluid Mechanics 2011, 25, 1-14. DOI: 10.1051/epjconf/20122501066
dc.identifier.doi10.1051/epjconf/20122501066en_US
dc.identifier.endpage14
dc.identifier.issn2100-014Xen_US
dc.identifier.scopusqualityN/Aen_US
dc.identifier.startpage1
dc.identifier.urihttps://dx.doi.org/10.1051/epjconf/20122501066
dc.identifier.urihttps://hdl.handle.net/20.500.12395/28593
dc.identifier.volume25en_US
dc.identifier.wosWOS:000304449600066en_US
dc.identifier.wosqualityN/Aen_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.institutionauthorÖzgören, Muammer
dc.institutionauthorOkbaz, Abdulkerim
dc.institutionauthorDoğan, Sercan
dc.language.isoenen_US
dc.publisherE D P SCIENCESen_US
dc.relation.ispartofEfm11 - Experimental Fluid Mechanics 2011en_US
dc.relation.ispartofseriesEPJ Web of Conferences
dc.relation.publicationcategoryKonferans Öğesi - Uluslararası - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.selcuk20240510_oaigen_US
dc.subjectboundary layeren_US
dc.subjecto-ringen_US
dc.subjectsphereen_US
dc.subjectPIVen_US
dc.subjectpassive controlen_US
dc.subjectturbulenceen_US
dc.subjectvorticityen_US
dc.subjectwakeen_US
dc.titleTurbulent Shear Flow Downstream of a Sphere with and Without an O-Ring Located Over a Plane Boundaryen_US
dc.typeConference Objecten_US

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