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TECHNICAL PAPERS

Experimental and Numerical Study of the Motions of a Turret Moored FPSO in Waves

[+] Author and Article Information
C. Guedes Soares, N. Fonseca

Unit of Marine Technology and Engineering,  Technical University of Lisbon, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal

R. Pascoal

Unit of Marine Technology and Engineering,  Technical University of Lisbon, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugalguedess@mar.ist.utl.pt

J. Offshore Mech. Arct. Eng 127(3), 197-204 (Nov 04, 2004) (8 pages) doi:10.1115/1.1951774 History: Received December 09, 2003; Accepted November 04, 2004; Revised November 04, 2004

This paper presents the results of an experimental program carried out with a model of a FPSO (Floating Production, Storage and Offloading) unit moored and subjected to incoming waves. In regular waves, a wide range of wavelengths were tested and the effect of the wave amplitude was also investigated. In irregular waves the model was subjected to different sea states, including very severe significant wave heights. The measured responses include the six degrees of freedom absolute motions, relative motions, and the mooring forces. The experimental data of surge, heave, and pitch is compared with calculated results from a Green’s function panel method and a strip theory program. In general, the agreement between experimental and numerical data is very good.

Copyright © 2005 by American Society of Mechanical Engineers
Topics: Force , Motion , Waves , FPSO , Mooring , Surges , Ships , Strips
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Figures

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Figure 2

Mooring line arrangement—side view

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Figure 3

Horizontal mooring force as function of the horizontal excursion

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Figure 4

Surge transfer function

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Figure 5

Heave transfer function

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Figure 6

Pitch transfer function

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Figure 7

Tested wave spectra with Tp=12s

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Figure 8

Tested wave spectra with Tp=18s

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Figure 9

Surge response spectra in head waves, for sea states with Tp=12s and different Hs

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Figure 10

Heave response spectra in head waves, for sea states with Tp=12s and different Hs

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Figure 11

Pitch response spectra in head waves, for sea states with Tp=12s and different Hs

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Figure 12

Surge response spectra in head waves, for sea states with Tp=18s and different Hs

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Figure 13

Heave response spectra in head waves, for sea states with Tp=18s and different Hs

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Figure 14

Pitch response spectra in head waves, for sea states with Tp=18s and different Hs

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Figure 15

Surge response spectra in bow waves, θ=165°, for sea states with Tp=12s, and different Hs

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Figure 16

Heave response spectra in bow waves, θ=165°, for sea states with Tp=12s, and different Hs

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Figure 17

Pitch response spectra in bow waves, θ=165°, for sea states with Tp=12s, and different Hs

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Figure 18

Surge response spectra in bow waves, θ=165°, for sea states with Tp=18s, and different Hs

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Figure 19

Heave response spectra in bow waves, θ=165°, for sea states with Tp=18s, and different Hs

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Figure 20

Pitch response spectra in bow waves, θ=165°, for sea states with Tp=18s, and different Hs

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Figure 21

Surge response spectra in bow waves, θ=120°, for sea states with Tp=12s, and different Hs

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Figure 22

Heave response spectra in bow waves, θ=120°, for sea states with Tp=12s, and different Hs

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Figure 23

Pitch response spectra in bow waves, θ=120°, for sea states with Tp=12s, and different Hs

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Figure 24

Pitch transfer functions for headings of 180° and 120° (calculated by WAMIT). Response amplitudes are normalized by the wave amplitude

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