Vortex-induced vibration (VIV) in oscillatory flow is experimentally investigated in the ocean basin. The test flexible cylinder was forced to harmonically oscillate in various combinations of amplitude and period with Keulegan-Carpenter () number between 26 and 178 in three different maximum reduced velocities, , , and separately. VIV responses at cross-flow (CF) direction are investigated using modal decomposition and wavelet transformation. The results show that VIV in oscillatory flow is quite different from that in steady flow; features, such as intermittent VIV, hysteresis, amplitude modulation, and mode transition (time sharing) are observed. Moreover, a VIV developing process including “building-up,” “lock-in,” and “dying-out” in oscillatory flow, is further proposed and analyzed.
Features of Vortex-Induced Vibration in Oscillatory Flow
Shanghai Jiao Tong University,
Centre for Ships and Ocean Structures, NTNU,
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received April 23, 2013; final manuscript received October 3, 2013; published online November 28, 2013. Assoc. Editor: Wei Qiu.
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Fu, S., Wang, J., Baarholm, R., Wu, J., and Larsen, C. M. (November 28, 2013). "Features of Vortex-Induced Vibration in Oscillatory Flow." ASME. J. Offshore Mech. Arct. Eng. February 2014; 136(1): 011801. https://doi.org/10.1115/1.4025759
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