Seabed Effects on the Hydrodynamics of a Circular Cylinder Undergoing Vortex-Induced Vibration at High Reynolds Number
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 140, Issue 3
Abstract
The hydrodynamic character of a wall-free and near-wall circular cylinder oscillating in the transverse direction in a steady current was experimentally investigated at a Reynolds number of . Forces in both the in-line and cross-flow directions were measured by three-dimensional force transducers. The effects of the near wall on the hydrodynamic coefficients of the cylinder at high Reynolds number are studied. Experimental results indicate that: (1) the first-order oscillating drag coefficient obtained in the near-wall cases is larger than the second-order oscillating drag coefficient and is almost one-third of the mean drag coefficient; (2) compared with the wall-free cases, the Strouhal number is bigger, and the lock-in phenomenon occurs at a higher nondimensional frequency in the near-wall cases; (3) the near wall has a significant effect on the power transfer and therefore leads to a larger lift coefficient in phase with the velocity than in the wall-free cases, indicating that hydrodynamic coefficients based on wall-free cylinders may not be suitable for predicting the vortex-induced vibration of pipelines; and (4) as the gap ratio decreases to 0.1, the vortex shedding can be totally suppressed by the near wall.
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Acknowledgments
The financial support of the Natural Science Foundation of China (Grant Nos. 51009088 and 51279101) is gratefully acknowledged.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 140 • Issue 3 • May 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: May 7, 2013
Accepted: Sep 30, 2013
Published online: Oct 2, 2013
Published in print: May 1, 2014
Discussion open until: Jul 20, 2014
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