RESEARCH PAPERS: Offshore Mechanics

Computation of Slowly Varying Second-Order Hydrodynamic Forces on Floating Structures in Irregular Waves

[+] Author and Article Information
T. Matsui

Department of Architecture, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan

J. Offshore Mech. Arct. Eng 111(3), 223-232 (Aug 01, 1989) (10 pages) doi:10.1115/1.3257151 History: Received January 01, 1987; Revised October 07, 1988; Online October 30, 2009


An exact second-order formulation is presented for computing the slowly varying second-order hydrodynamic forces on floating structures in irregular waves. The near-field approach based on direct integration of the fluid pressure on the submerged body surface is employed in conjunction with numerical first-order solutions by means of the hybrid finite element technique. Green’s second identity is exploited to evaluate the second-order forces due to the second-order velocity potential. Numerical results are presented for the slow drift excitation forces on an articulated column and a semi-submersible platform. It is shown that the contribution from the second-order velocity potential is more significant to the roll moment than to the sway and heave forces on the semi-submersible.

Copyright © 1989 by ASME
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