Wave Diffraction Around Three-Dimensional Bodies in a Current

[+] Author and Article Information
K. F. Cheung

Department of Ocean Engineering, University of Hawaii at Manoa, 2540 Dole Street, Holmes Hall 402, Honolulu, HI 96822

M. Isaacson

Department of Civil Engineering, University of British Columbia, Vancouver, B.C., Canada V6T 1Z4

J. W. Lee

Department of Ocean Civil Engineering, Korea Maritime University, Pusan 606-791, Korea

J. Offshore Mech. Arct. Eng 118(4), 247-252 (Nov 01, 1996) (6 pages) doi:10.1115/1.2833912 History: Received February 26, 1995; Revised May 10, 1996; Online January 25, 2008


The effects of a collinear current on the diffraction of regular waves around three-dimensional surface-piercing bodies are examined. With the current speed assumed to be small, the boundary-value problem is separated into a steady current problem with a rigid wall condition applied at the still water level and a linear wave propagation problem in the resulting current field. The boundary conditions of the wave propagation problem are satisfied by a time-stepping procedure and the field solution is obtained by an integral equation method. Free surface profiles, runup, and wave forces are described for a vertical circular cylinder in combined waves and a current. The current is shown to affect significantly the steady drift force and runup predictions. Comparisons of the computed wave forces are made with a previous numerical solution involving a semi-immersed sphere in deep water, and indicate good agreement.

Copyright © 1996 by The American Society of Mechanical Engineers
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