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TECHNICAL PAPERS

Numerical Prediction of Impact-Related Wave Loads on Ships

[+] Author and Article Information
Thomas E. Schellin

 Germanischer Lloyd AG, Vorsetzen 35, Hamburg 20459, Germanythomas.schellin@gl-group.com

Ould el Moctar

 Germanischer Lloyd AG, Vorsetzen 35, Hamburg 20459, Germany

J. Offshore Mech. Arct. Eng 129(1), 39-47 (Nov 08, 2006) (9 pages) doi:10.1115/1.2429695 History: Received June 26, 2006; Revised November 08, 2006

We present a numerical procedure to predict impact-related wave-induced (slamming) loads on ships. The procedure was applied to predict slamming loads on two ships that feature a flared bow with a pronounced bulb, hull shapes typical of modern offshore supply vessels. The procedure used a chain of seakeeping codes. First, a linear Green function panel code computed ship responses in unit amplitude regular waves. Ship speed, wave frequency, and wave heading were systematically varied to cover all possible combinations likely to cause slamming. Regular design waves were selected on the basis of maximum magnitudes of relative normal velocity between ship critical areas and wave, averaged over the critical areas. Second, a nonlinear strip theory seakeeping code determined ship motions under design wave conditions, thereby accounting for the nonlinear pressure distribution up to the wave contour and the frequency dependence of the radiation forces (memory effect). Third, these nonlinearly computed ship motions constituted part of the input for a Reynolds-averaged Navier–Stokes equations code that was used to obtain slamming loads. Favorable comparison with available model test data validated the procedure and demonstrated its capability to predict slamming loads suitable for design of ship structures.

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Copyright © 2007 by American Society of Mechanical Engineers
Topics: Motion , Stress , Waves , Design , Ships , Hull , Pressure , Force
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Figures

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Figure 1

Part of numerical grid domains surrounding Hull 1

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Figure 4

Time histories of measured and computed vertical force on bow section of Hull 1

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Figure 5

Time histories of measured and computed pressures on plate field 1 of Hull 1

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Figure 6

Locations of (a) critical plate field 1 and (b) critical plate field 2 for Hull 1

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Figure 7

Locations of (a) critical plate field 3 and (b) critical plate field 4 for Hull 1

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Figure 8

Time histories of slamming pressures at plate fields 1–4 for Hull 1

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Figure 9

Typical predicted pressure distribution during slamming for Hull 1

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Figure 10

Locations of critical plate fields for Hull 2

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Figure 11

Simulation of Hull 2 under design wave conditions: (a) deck immergence and (b) bow immergence

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Figure 12

Pressure distribution on Hull 2

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Figure 13

Time histories of slamming pressure for Hull 2 under design wave conditions

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Figure 3

Locations of separated bow section (dark shading) and critical plate fields (light shading) for Hull 1

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Figure 2

Computed and measured amplitudes of (a) pitch (deg) and (b) vertical acceleration (m/s2) of Hull 1 in regular head waves

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