Heave Response of Classic Spar With Variable Geometry

[+] Author and Article Information
Longbin Tao

School of Engineering, Griffith University, Gold Coast, QLD 9726, Australiae-mail: L.Tao@griffith.edu.au

Kay Yeong Lim

Worley Ltd., Perth, Australiae-mail: kay-yeong.lim@worley.com.au

Krish Thiagarajan

School of Oil and Gas Engineering, The University of Western Australia, Crawley, WA 6009, Australiae-mail: krisht@cyllene.uwa.edu.au

J. Offshore Mech. Arct. Eng 126(1), 90-95 (Mar 02, 2004) (6 pages) doi:10.1115/1.1643085 History: Received October 01, 2002; Revised February 01, 2003; Online March 02, 2004
Copyright © 2004 by ASME
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Classic spar with constant cross-section area and spars with alternative hull shapes (Hs1—Hs4)
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Sketch of a spar in wave: H—water depth, β–wave-heading angle
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Problem definition: A vertical cylinder in heave
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Iterative post-processing procedure
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Added mass coefficients of the spar and alternative hull shapes (Ca∼Kc).Cap—potential flow solution; Cav—viscous flow solution
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Heave responses (the peak RAOs being truncated) of spars without viscous effect (RAO33∼T)
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Effects of hull shapes in wave excitation forces (F33∼T).D—diameter of spar hull, ρ—density of the fluid, ∀—displaced volume of spar hull, A—wave amplitude of the incoming waves, g—acceleration of gravity
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Wave radiation damping and viscous damping of the spar hulls (Z∼Kc)
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Heave responses of spars with viscous effect (RAO33∼T).




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