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Calculation of ship roll hydrodynamic coefficients in regular beam waves

Kianejad, S, Enshaei, H ORCID: 0000-0002-5649-7015, Duffy, J ORCID: 0000-0003-3484-1345 and Ansarifard, N ORCID: 0000-0002-7619-1697 2020 , 'Calculation of ship roll hydrodynamic coefficients in regular beam waves' , Ocean Engineering , pp. 1-17 , doi: 10.1016/j.oceaneng.2020.107225.

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Abstract

Simulation of a ship’s roll motion through equation-based approaches requires restoring moment, added massmoment of inertia and damping coefficients. Accurate estimation of these coefficients enhances the prediction ofship roll response at a resonance condition. However, the magnitude of these coefficients in regular beam seasand close to a resonance condition is unknown. The present study adopts numerical and experimental simulationsto investigate the effects of different wave heights and wave frequencies on ship motion characteristics. Themotion characteristics results from numerical simulations are compared against experimental measurements, anda good correlation is achieved. The restoring moment in dynamic conditions is calculated and compared to thehydrostatic restoring moment. The dynamic restoring moment is greater than the hydrostatic restoring momentfor some wave frequencies and smaller for other wave frequencies. The magnitudes of roll damping and addedmass moment of inertia coefficients are calculated at different wave heights and frequencies, and the results yieldthat there is quite a nonlinear relationship between the roll hydrodynamic coefficients and roll motioncharacteristics.

Item Type: Article
Authors/Creators:Kianejad, S and Enshaei, H and Duffy, J and Ansarifard, N
Keywords: motion characteristics, sdded mass moment of inertia, damping coefficient, Restoring moment, resonance, CFD
Journal or Publication Title: Ocean Engineering
Publisher: Pergamon-Elsevier Science Ltd
ISSN: 0029-8018
DOI / ID Number: 10.1016/j.oceaneng.2020.107225
Copyright Information:

© 2020 Elsevier Ltd. All rights reserved.

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