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RESEARCH PAPERS: Offshore Mechanics

Hydrodynamic Coefficients of Vertical Cylinders of Arbitrary Section

[+] Author and Article Information
M. Isaacson, T. Mathai

Department of Civil Engineering, University of British Columbia, Vancouver, British Columbia, Canada

J. Offshore Mech. Arct. Eng 113(2), 109-116 (May 01, 1991) (8 pages) doi:10.1115/1.2919906 History: Received December 21, 1989; Revised August 07, 1990; Online June 12, 2008

Abstract

The calculation of added masses and damping coefficients of a large surface-piercing vertical cylinder of arbitrary section extending to the seabed and undergoing harmonic oscillations is described. The linear radiation problem in three dimensions is reduced to a series of two-dimensional problems in the horizontal plane by the use of appropriate eigenfunctions that represent the variation of the velocity potential in the vertical direction. Each of these is solved by a numerical approach based on the method of integral equations. Comparisons are made with an analytic solution available for the case of a circular cylinder. Results are also provided for square cylinders, and the application to typical offshore structures subject to base motions is discussed.

Copyright © 1991 by The American Society of Mechanical Engineers
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