The impacts of the free-surface and angle of attack on the flow structures around a torpedo-like geometry

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dc.authoridKILAVUZ, Alpaslan/0000-0002-5180-3837
dc.authoridSahin, Besir/0000-0003-0671-0890
dc.authoridSekeroglu, Ertugrul/0000-0002-6592-3872
dc.authoridDurhasan, Tahir/0000-0001-5212-9170
dc.contributor.authorKilavuz, A.
dc.contributor.authorSarigiguzel, F.
dc.contributor.authorOzgoren, M.
dc.contributor.authorDurhasan, T.
dc.contributor.authorSahin, B.
dc.contributor.authorKavurmacioglu, L. A.
dc.contributor.authorAkilli, H.
dc.date.accessioned2025-01-06T17:36:31Z
dc.date.available2025-01-06T17:36:31Z
dc.date.issued2022
dc.description.abstractThis study presents the hydrodynamic characteristics around a torpedo-like geometry under the free-surface effect at different angles of attack using preliminary dye visualization and Particle Image Velocimetry (PIV). The optimized torpedo-like geometry is placed at submersion ratios between 0.5 <= h/D <= 3.50 where h is the distance to the free-surface from its centerline and D is the diameter. Throughout the experiments, angles of attack were taken as 0 degrees <=alpha <= 12 degrees for two Reynolds numbers, Re & nbsp;=& nbsp;2.0 & nbsp;x & nbsp;10(4)& nbsp;and 4.0 & nbsp;x & nbsp;10(4). The PIV method provided instantaneous vorticity and time-averaged velocity components, vorticity, streamline topology, fluctuating velocity components, Reynolds stress correlation, and the turbulent kinetic energy. This study focused on the stern section and the wake structures at & nbsp;h/D=1.0 & nbsp;. It is demonstrated that a jet-like flow region occurred between the model and the free-surface for all angles of attack at small submersion ratios of 0.5 <= h/D <= 1.0 while it is observed at & nbsp;h/D=1.5 & nbsp;for & nbsp;alpha=8 degrees, a jet-like flow region occurred between the model and the free-surface. The impact of the jet-like flow was more noticeable for & nbsp;alpha=4 degrees & nbsp;and 8 degrees with & nbsp;velocity fluctuations & nbsp;in lower magnitudes. The nose section partially pierced the free-surface for h/D & nbsp;=& nbsp;0.5, 0.75, and 1.0 in the range of 4 degrees <=alpha <= 12 degrees and it prevented the wake region from connecting with the free-surface by directing the separated flow region toward the stern section. Pointwise variations of the turbulence data extracted from vertical lines within the wake region for all cases revealed that the effect of the free-surface on the turbulence statistics was negligible beyond h/D=2.0.
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK) [214M318]; Cukurova University Scientific Research Project Coordinators (BAP) , Turkey [FYL-2019-11596]
dc.description.sponsorshipThe authors want to acknowledge the Scientific and Technological Research Council of Turkey (TUBITAK) under Contract No. 214M318 and the financial support of Cukurova University Scientific Research Project Coordinators (BAP) , Turkey under Contract No FYL-2019-11596. The authors thank the Mechanical Engineering Department of Cukurova University and Advanced Fluid Mechanics PIV laboratory of Osmaniye Korkut Ata University, Turkey for using the PIV system.
dc.identifier.doi10.1016/j.euromechflu.2021.12.005
dc.identifier.endpage243
dc.identifier.issn0997-7546
dc.identifier.issn1873-7390
dc.identifier.scopus2-s2.0-85122435714
dc.identifier.scopusqualityQ1
dc.identifier.startpage226
dc.identifier.urihttps://doi.org/10.1016/j.euromechflu.2021.12.005
dc.identifier.urihttps://hdl.handle.net/20.500.14669/1910
dc.identifier.volume92
dc.identifier.wosWOS:000791237600006
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier
dc.relation.ispartofEuropean Journal of Mechanics B-Fluids
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20241211
dc.subjectAUV
dc.subjectPIV
dc.subjectVortical flow
dc.subjectTurbulent flow
dc.subjectFree-surface
dc.subjectFlow separation
dc.titleThe impacts of the free-surface and angle of attack on the flow structures around a torpedo-like geometry
dc.typeArticle

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