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Abstract

Prediction of a ship's roll motion in parametric roll and dead ship condition using CFD and experiments is timeconsuming and expensive, while a reliable equation based method can drastically decrease the computationtime. The commonly used roll motion equation contains roll mass and added mass moment of inertia, dampingand restoring terms and associated coefficients. Improving the prediction of these coefficients increases theaccuracy of the method. There is a lack of precise calculation for the roll added mass moment of inertia, which iscommonly estimated using semi-empirical techniques and as a percentage of the roll mass moment of inertiacoefficient. This paper presents a new method to determine the roll added mass moment of inertia using CFDsimulations based on a harmonic excitation roll motion technique and the results are compared againstBhattacharyya's method. The influences of excitation frequency, Froude number, roll angle and appendages onthe roll motion characteristics and the roll added mass moment of inertia coefficient are investigated. In addition,the roll added mass moment of inertia coefficients on the model scale and full scale ship are computed toinvestigate the scale effect.

Item Type:	Article
Authors/Creators:	Kianejad, SS and Enshaei, H and Duffy, J and Ansarifard, N
Keywords:	roll added mass moment of inertia, harmonic excited roll motion, roll angle, resonance, CFD
Journal or Publication Title:	Ocean Engineering
Publisher:	Pergamon-Elsevier Science Ltd
ISSN:	0029-8018
DOI / ID Number:	https://doi.org/10.1016/j.oceaneng.2018.12.049
Copyright Information:	Copyright 2018 Crown Copyright
Related URLs:	Google Scholar: Enshaei, H UTAS Profile: Enshaei, H Google Scholar: Duffy, J UTAS Profile: Duffy, J
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