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http://dx.doi.org/10.1016/j.ijnaoe.2020.07.005

Wake dynamics of a 3D curved cylinder in oblique flows  

Lee, Soonhyun (Department of Naval Architecture and Ocean Engineering, Inha University)
Paik, Kwang-Jun (Department of Naval Architecture and Ocean Engineering, Inha University)
Srinil, Narakorn (School of Engineering, Newcastle University)
Publication Information
International Journal of Naval Architecture and Ocean Engineering / v.12, no.1, 2020 , pp. 501-517 More about this Journal
Abstract
Three-dimensional numerical simulations were performed to study the effects of flow direction and flow velocity on the flow regime behind a curved pipe represented by a curved circular cylinder. The cylinder is based on a previous study and consists of a quarter segment of a ring and a horizontal part at the end of the ring. The cylinder was rotated in the computational domain to examine five incident flow angles of 0-180° with 45° intervals at Reynolds numbers of 100 and 500. The detailed wake topologies represented by λ2 criterion were captured using a Large Eddy Simulation (LES). The curved cylinder leads to different flow regimes along the span, which shows the three-dimensionality of the wake field. At a Reynolds number of 100, the shedding was suppressed after flow angle of 135°, and oblique flow was observed at 90°. At a Reynolds number of 500, vortex dislocation was detected at 90° and 135°. These observations are in good agreement with the three-dimensionality of the wake field that arose due to the curved shape.
Keywords
Vortex-Induced Vibration (VIV); Wake; Curved cylinder; Wake topology; Large Eddy Simulation (LES); criterion; Computational Fluid Dynamics (CFD); Flow regime; Marine riser;
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Times Cited By KSCI : 2  (Citation Analysis)
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