Flow topology downstream of the hollow square cylinder with slots

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dc.authoridDurhasan, Tahir/0000-0001-5212-9170
dc.contributor.authorDurhasan, Tahir
dc.date.accessioned2025-01-06T17:37:23Z
dc.date.available2025-01-06T17:37:23Z
dc.date.issued2020
dc.description.abstractFlow patterns downstream of the hollow square cylinder with slots are experimentally investigated to show effect of the slot ratio on the wake flow characteristics and turbulence statistics at Reynolds number of Re = 6000 using the particle image velocimetry (PIV) technique. Proper orthogonal decomposition (POD) analyses indicate that the self-issuing jet dramatically changes the mechanism of vortex shedding interaction. Penetration of the self-issuing jet into the wake region leads to increasing of the vortex formation length for low slot ratios. On the other hand, the self-issuing jet penetrates further downstream due to increasing momentum coefficient of the jet and splits the wake region in half for high slot ratios. Strouhal number increases with the increasing slot ratio and it attains approximately the twofold of the solid cylinder case, since the self-issuing jet accelerates the vortex shedding process. However, turbulence statistics are significantly reduced for all slot ratios. Distributions of the spectral density in the wake region of the cylinder indicate that the vortex shedding instability could be reduced considerably by the slotted cylinder. Drag coefficient, which is estimated from PIV data, reduces up to 42% in comparison with the solid cylinder model.
dc.identifier.doi10.1016/j.oceaneng.2020.107518
dc.identifier.issn0029-8018
dc.identifier.scopus2-s2.0-85085019912
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.oceaneng.2020.107518
dc.identifier.urihttps://hdl.handle.net/20.500.14669/2215
dc.identifier.volume209
dc.identifier.wosWOS:000542188700029
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherPergamon-Elsevier Science Ltd
dc.relation.ispartofOcean Engineering
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20241211
dc.subjectDecomposition of the spectral analysis
dc.subjectEstimated drag coefficient
dc.subjectFlow topology
dc.subjectPIV
dc.subjectPOD
dc.subjectSlotted hollow square cylinder
dc.titleFlow topology downstream of the hollow square cylinder with slots
dc.typeArticle

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