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RESEARCH PAPERS: Offshore Mechanics

Numerical Simulation of Nonlinear Wave Diffraction by a Vertical Cylinder

[+] Author and Article Information
C. Yang, R. C. Ertekin

Department of Ocean Engineering, University of Hawaii at Manoa, Honolulu, HI 96822

J. Offshore Mech. Arct. Eng 114(1), 36-44 (Feb 01, 1992) (9 pages) doi:10.1115/1.2919950 History: Received October 01, 1990; Revised September 23, 1991; Online June 12, 2008

Abstract

A three-dimensional time domain approach is used to study nonlinear wave diffraction by a fixed, vertical circular-cylinder that extends to the sea floor. In this approach, the development of the flow can be obtained by a time-stepping procedure, in which the velocity potential of the flow at any instant of time is obtained by the boundary-element method. In the numerical calculations, the exact body-boundary condition is satisfied on the instantaneous wetted surface of the cylinder, and an extended Sommerfeld condition is developed and used as the numerical radiation condition. The fourth-order Adams-Bashford method is employed in the time stepping scheme. Calculations are done to obtain the nonlinear diffraction of solitary waves and Stokes second-order waves by a vertical circular-cylinder. Numerical results are compared with the available linear and second-order wave-force predictions for some given wave height and wavelength conditions, and also with experimental data. Present horizontal force results agree better with the experimental data than the previous predictions.

Copyright © 1992 by The American Society of Mechanical Engineers
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