Hydrodynamic Forces on a Large Pipeline and a Small Pipeline in Piggyback Configuration under Wave Action
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 138, Issue 5
Abstract
Experiments on a large pipeline and a small pipeline in a piggyback configuration under regular and irregular waves are carried out. A comparison of the wave forces on the large pipeline and the small pipeline is made. The nondimensional force coefficients for the drag, inertia, and lift are obtained based on the Morison equation. The effects of the Keulegan-Carpenter (KC) number and the spacing ratio between the two pipelines on the force coefficients for the large pipeline, small pipeline, and piggyback pipeline system are investigated. The experimental results indicate that the variation tendencies of the drag coefficients and inertia coefficients with the KC number or the spacing ratio for the large pipeline, small pipeline, and piggyback pipeline system are similar. The variation tendency of the lift coefficient with the spacing ratio for the large pipeline is opposite to that for the small one.
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Acknowledgments
The writers would like to acknowledge the support from the Foundation for Innovative Research Groups of the National Natural Science Foundation of China under Grant No. 50,921,001. The writers also wish to thank Mr. G. W. Li, Mrs. Y. Sun, and Mrs. F. Jiang for their assistance in the experiment.
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© 2012 American Society of Civil Engineers.
History
Received: May 24, 2011
Accepted: Dec 15, 2011
Published online: Dec 20, 2011
Published in print: Sep 1, 2012
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