Experimental investigation of flow structures around a torpedo-like geometry placed in a boundary layer flow

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dc.contributor.authorHayder M.A.H.
dc.contributor.authorGoktepeli I.
dc.contributor.authorYagmur S.
dc.contributor.authorOzgoren M.
dc.contributor.authorKose F.
dc.contributor.authorKavurmacioglu L.A.
dc.date.accessioned2020-03-26T20:11:46Z
dc.date.available2020-03-26T20:11:46Z
dc.date.issued2018
dc.departmentSelçuk Üniversitesien_US
dc.description.abstractDefense applications for both under oceans and seas, particularly underwater vehicles have been considered in this research. With this aim, flow characteristics around a torpedo-like geometry under the effect of the boundary layer flow over a smooth flat plate have been experimentally examined by using PIV technique. All of the experiments have been done for Re = 20000 and Re = 40000 based on the length (L) of the geometry as a characteristic length. As a result, time-averaged streamwise velocity components < u* >, velocity vectors < v >, streamline topologies < ? > and Reynolds stress correlations < u'v'/U?2 > in the wake region of the torpedo-like geometry have been acquired in the range of 0 ? G/D ? 1.5. Here, G is the space between the bottom point of the geometry and flat plate surface; D stands for the diameter of the geometry. It is found that at the smallest value of G/D = 0.25, jet-like flow occurs between the plate and the model which causes a powerful scouring. As the gap ratio is increased to G/D = 0.5 and G/D = 1.0, the jet-like flow diminishes slightly and then the flow structure in the wake region becomes similar to the uniform incoming flow condition for G/D = 1.50. Due to the effect of the jet-like flow and boundary layer flow, time-averaged flow patterns present asymmetrical distributions which are clearly shown a bigger size focus close to the plate in streamline topology. Reynolds stress patterns form more powerful viscous forces in the boundary layer flow due to the occurrence of eddy vortices and viscosity effect. It is observed from the aforementioned flow patterns that interaction between the flow structure, the model and boundary layer flow yields very complex structure. In order to decrease the energetic flow in this condition, passive or active flow control method can be integrated on the torpedo-like geometry. © 2018 by authors.en_US
dc.identifier.doi10.13189/ujme.2018.060101en_US
dc.identifier.endpage8en_US
dc.identifier.issn2332-3353en_US
dc.identifier.issue1en_US
dc.identifier.scopusqualityN/Aen_US
dc.identifier.startpage1en_US
dc.identifier.urihttps://dx.doi.org/10.13189/ujme.2018.060101
dc.identifier.urihttps://hdl.handle.net/20.500.12395/37200
dc.identifier.volume6en_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherHorizon Research Publishingen_US
dc.relation.ispartofUniversal Journal of Mechanical Engineeringen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.selcuk20240510_oaigen_US
dc.subjectBoundary layer flowen_US
dc.subjectPIVen_US
dc.subjectTorpedo-like geometryen_US
dc.subjectTurbulent flowen_US
dc.subjectVorticityen_US
dc.titleExperimental investigation of flow structures around a torpedo-like geometry placed in a boundary layer flowen_US
dc.typeArticleen_US

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