Abstract
In this article, validation of numerical models of ship wave-induced motions in port-approach channels is carried out. A selected set of high-quality data from recent full-scale trials measuring vertical motions of container ship transits entering and leaving the Port of Fremantle, Western Australia, is used. The measured wave-induced heave, roll, and pitch motions of six example container ship transits are discussed in detail, together with descriptions of in situ wave measurements and wave spectral analysis. A linear strip method, as implemented in the computer code OCTOPUS, is applied to predict the ship wave-induced motions. A comparison is made between measured and predicted ship motion responses to validate the ship motion software, and the measured roll response can be particularly used to assess the suitability of existing roll damping methods at full scale. The method is shown to give predictions of heave, roll, and pitch responses with reasonable accuracy for container ships at full scale in open dredged channels. Large-amplitude long-period roll motions were observed in some cases of the present trials, and unexpected harmonic pitch motions were also observed in other cases. Further research is recommended to study these seemingly nonlinear effects.
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Acknowledgments
The authors thank all of the marine pilots and staff at Fremantle Ports for their assistance, support, and enthusiasm in conducting the trials. The authors also acknowledge the following organizations for their contributions to this research: coastal infrastructure team from Western Australian Department of Transport (WA DoT), who provided measured wave data and authorization to use the W@ves21 software; Seamax Shipping, CMA CGM, Seaspan Corporation and Safmarine, which provided access to and hull information for SEAMAX STAMFORD, CMA CGM WAGNER and CMA CGM LAMARTINE, MOL EMISSARY, and SAFMARINE MAKUTU, respectively; and Flanders Hydraulics Research and Ghent University, which provided hull data for FHR Ship D. The contribution of an Australian Government Research Training Program Scholarship in supporting this research is acknowledged by the authors.
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Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 144 • Issue 6 • November 2018
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© 2018 American Society of Civil Engineers.
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Received: Sep 19, 2017
Accepted: May 29, 2018
Published online: Sep 7, 2018
Published in print: Nov 1, 2018
Discussion open until: Feb 7, 2019
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