Measurements of transverse forces on circular cylinders undergoing vortex-induced vibration |
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| Affiliation: | 1. IRPHE, Marseille, France.;2. "Cornell University, Ithaca, NY, USA;1. Department of Mathematics and Statistics, Memorial University of Newfoundland, St. John׳s, NL, Canada A1C 5S7;2. Department of Mathematics, Middle East Technical University, Ankara, Turkey;1. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109-2145, USA;2. Department of Mechanical Engineering, AMRIT University, Amritapuri P.O., Kerala, India;3. Department of Naval architecture and Marine Engineering, University of Michigan, Ann Arbor, MI 48109-2145, USA;4. CTO, Vortex Hydro Energy, 7444 Ann Arbor Rd., Dexter, MI 48130, USA |
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| Abstract: | Experiments have been carried out on a circular cylinder, with and without helical strakes, free to respond in a direction transverse to a water flow. The Reynolds number range was between 3×103 and 2.1×104, the mass ratio was just above 0.8 and the fraction of critical damping was approximately 2×10−4. Measurements are presented of the response, the transverse fluid force and the phase angle between the response and the force, all as a function of reduced velocity. The straked cylinder is observed to respond over a narrow range of reduced velocity and its maximum amplitude is decreased by just over 60%, compared with a plain cylinder. The familiar phase jump that occurs for a plain cylinder did not occur with the straked one, with the phase close to zero over the entire reduced velocity range where response to vortex shedding occurred. |
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