Experiments regarding flow-induced vibration on floating rounded squared section cylinders with low aspect ratio were carried out in an ocean basin equipped with a rotating-arm apparatus. Floating squared section cylinders with rounded edges and aspect ratios of L/D = 2.0 were elastically supported by a set of linear springs in order to provide low structural damping to the system. Two different incidence angles were tested, namely 0 and 45 degrees. The Reynolds numbers covered the range from 2,000 to 30,000. The aim was to understand the flow-induced vibrations around single columns, gathering information for further understanding the causes for the Vortex-Induced Motions in semi-submersible and TLP platforms. Experiments on circular and squared sections cylinders (without rounded edges) were also carried out to compare the results with the rounded square section cylinders (with rounded edges). The amplitude results for in-line, transverse and yaw amplitude for 0-degree models showed to be higher for squared section cylinders compared to those for the rounded square section cylinders. No significant difference between the 45-degree models was observed. The results of ratio between frequency of motion in the transverse direction and natural frequency in still water confirmed the vortex-induced vibration behavior for the squared and rounded square section cylinders for 45-degree incidence; and also the galloping characteristics for 0-degree incidence cases. The rounded effect on the square section cylinders showed to be important only for reduced velocity larger than 8, which is probably related to the position of the separation point that changes around the rounded edge, behavior that did not occurr for the squared edge that fixed the separation point for any reduced velocity.
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ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering
June 19–24, 2016
Busan, South Korea
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4993-4
PROCEEDINGS PAPER
Experimental Study on Flow-Induced Vibration of Floating Squared Section Cylinders With Low Aspect Ratio: Part II — Effects of Rounded Edges Available to Purchase
Rodolfo T. Gonçalves,
Rodolfo T. Gonçalves
University of São Paulo, São Paulo, Brazil
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Dennis M. Gambarine,
Dennis M. Gambarine
University of São Paulo, São Paulo, Brazil
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Aline M. Momenti,
Aline M. Momenti
University of São Paulo, São Paulo, Brazil
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Felipe P. Figueiredo,
Felipe P. Figueiredo
University of São Paulo, São Paulo, Brazil
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André L. C. Fujarra
André L. C. Fujarra
Federal University of Santa Catarina, Joinville, Brazil
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Rodolfo T. Gonçalves
University of São Paulo, São Paulo, Brazil
Dennis M. Gambarine
University of São Paulo, São Paulo, Brazil
Aline M. Momenti
University of São Paulo, São Paulo, Brazil
Felipe P. Figueiredo
University of São Paulo, São Paulo, Brazil
André L. C. Fujarra
Federal University of Santa Catarina, Joinville, Brazil
Paper No:
OMAE2016-54813, V002T08A061; 9 pages
Published Online:
October 18, 2016
Citation
Gonçalves, RT, Gambarine, DM, Momenti, AM, Figueiredo, FP, & Fujarra, ALC. "Experimental Study on Flow-Induced Vibration of Floating Squared Section Cylinders With Low Aspect Ratio: Part II — Effects of Rounded Edges." Proceedings of the ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. Volume 2: CFD and VIV. Busan, South Korea. June 19–24, 2016. V002T08A061. ASME. https://doi.org/10.1115/OMAE2016-54813
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