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Quasisteady theory for the hydrodynamic forces on a circular cylinder undergoing vortex-induced vibration
Authors:Yoshiki Nishi  Kentaroh Kokubun  Kunihiro Hoshino  Shotaro Uto
Institution:(1) Department of Systems Design for Ocean-Space, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya, Yokohama 2408501, Japan;(2) National Maritime Research Institute, 6-38-1 Shinkawa, Mitaka 1810004, Japan
Abstract:Vortex-induced vibrations of a rigid circular cylinder were studied by constructing a theory based on a wake oscillator model under quasisteady approximations, thereby evaluating vortex-induced hydrodynamic forces acting on the cylinder. A lock-in limit line representing the boundary for the occurrence of frequency lock-in was also theoretically derived. Hydrodynamic forces in forced oscillation problems estimated by the theory were compared with measured ones. Although some discrepancies were found, particularly in cases with high-frequency oscillations, good agreement was achieved in most cases. Accordingly, we conclude that the present theory captures well real phenomena in the wake downstream of a cylinder subjected to a flow.
Keywords:Vortex-induced vibration  Wake oscillator model  Riser pipe  Hydrodynamic force  Lock-in
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