The Hydrodynamics of Floating Compound Cylinders

[+] Author and Article Information
A. N. Williams, W. Li

Department of Civil and Environmental Engineering, University of Houston, Houston, TX 77204-4791

J. Offshore Mech. Arct. Eng 121(4), 213-218 (Nov 01, 1999) (6 pages) doi:10.1115/1.2829570 History: Received May 28, 1998; Revised July 09, 1999; Online December 17, 2007


The hydrodynamics of a freely floating compound cylinder consisting of a surface-piercing cylindrical column resting on a larger, concentric cylindrical base are investigated theoretically. Linear wave theory and small-amplitude structural oscillations are assumed, and an eigenfunction expansion approach is used to obtain semi-analytical expressions for the hydrodynamic excitation and reaction loads on the structure. Numerical results are presented for a range of wave and structural parameters. It is found that for certain parameter combinations, negative surge/sway added mass coefficients are predicted. The numerical results for the hydrodynamic quantities obtained by the eigenfunction approach have been verified with those obtained by the linear radiation/diffraction program UHWAVE. These results have implications for the tow-out analysis of large gravity-base oil production platforms.

Copyright © 1999 by The American Society of Mechanical Engineers
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