Flow characteristics comparison of PIV and numerical prediction results for an unmanned underwater vehicle positioned close to the free surface

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dc.contributor.authorKilavuz, A.
dc.contributor.authorOzgoren, M.
dc.contributor.authorKavurmacioglu, L. A.
dc.contributor.authorDurhasan, T.
dc.contributor.authorSarigiguzel, F.
dc.contributor.authorSahin, B.
dc.contributor.authorAkilli, H.
dc.date.accessioned2024-02-23T14:02:07Z
dc.date.available2024-02-23T14:02:07Z
dc.date.issued2022
dc.departmentNEÜen_US
dc.description.abstractIn the present paper, flow characteristics of an Unmanned Underwater Vehicle (UUV) with a commonly used Myring profile were investigated numerically and experimentally using Computational Fluid Dynamics (CFD) and the Particle Image Velocimetry (PIV) technique under the influence of free surface. The 3-D and two-phase flow simulation generated using the Volume of Fluid (VOF) were carried out using the Large Eddy Simulation (LES) turbulence model for high accuracy in both near free-surface and almost uniform flow conditions. Due to the presence of the free-surface effect, dynamics and unsteady instantaneous flow characteristics such as force and moment coefficients, streamlines topology, and pressure values on the body surface along with vorticity structures were found to be very chaotic and have irregular motion in the wake while the followable variation trend of the time-averaged properties was obtained to show critical immersion ratio. The immersion ratios of 0.75 <= h/D <= 3.50 were examined at Reynolds numbers Re = 2.0 x 104 and 4.0 x 104. Jet-like flow between the UUV body and the free surface of the water was detected at the immersion ratio of h/D = 0.75, which caused a substantial asymmetry in flow structures, resulting in highest drag and lift values. Increased surface disturbance at Re = 4.0 x 104 caused air introduction into via jet-like flow in h/D = 0.75, which caused positive lift. Hy-drodynamic coefficients and isosurfaces shown that the free-surface effect decreased significantly up to h/D = 1.50 at constant Reynolds numbers. Further investigation of time-averaged velocity components, streamlines, vorticity and turbulence statistics revealed that h/D = 1.50 acted as a transitional immersion ratio as the flow structure changed significantly with Reynolds numbers. The utilized CFD approach yielded especially excellent agreement with the PIV measurements with the discrepancy which varies from 1% to 15% in near wake for streamwise velocity components to simulate the essential unmeasured flow features needed in the research and development process of UUVs when they move below the free surface.en_US
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK) [FDK-2021-14066]; Cukurova University Scientific Research Project Coordinators (BAP); Advanced Fluid Mechanics PIV laboratory of Osmaniye Korkut Ata University, Turkey; [214M318]en_US
dc.description.sponsorshipThe authors would like 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) under Contract No FDK-2021-14066. The authors also thank the Advanced Fluid Mechanics PIV laboratory of Osmaniye Korkut Ata University, Turkey, for using the water channel and measurement systems and the Mechanical Engineering Department of Cukurova University for allowing usage of the CFD server cluster.en_US
dc.identifier.doi10.1016/j.apor.2022.103399
dc.identifier.issn0141-1187
dc.identifier.issn1879-1549
dc.identifier.scopus2-s2.0-85141340051en_US
dc.identifier.scopusqualityQ1en_US
dc.identifier.urihttps://doi.org/10.1016/j.apor.2022.103399
dc.identifier.urihttps://hdl.handle.net/20.500.12452/11592
dc.identifier.volume129en_US
dc.identifier.wosWOS:000883884700001en_US
dc.identifier.wosqualityQ1en_US
dc.indekslendigikaynakWeb of Scienceen_US
dc.indekslendigikaynakScopusen_US
dc.language.isoenen_US
dc.publisherElsevier Sci Ltden_US
dc.relation.ispartofApplied Ocean Researchen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectCfden_US
dc.subjectFree Surfaceen_US
dc.subjectPiven_US
dc.subjectTurbulent Flowen_US
dc.subjectUnmanned Underwater Vehicleen_US
dc.titleFlow characteristics comparison of PIV and numerical prediction results for an unmanned underwater vehicle positioned close to the free surfaceen_US
dc.typeArticleen_US

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