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Ship roll damping coefficient prediction using CFD

Kianejad, SS, Enshaei, H ORCID: 0000-0002-5649-7015, Duffy, J ORCID: 0000-0003-3484-1345, Ansarifard, N ORCID: 0000-0002-7619-1697 and Ranmuthugala, D ORCID: 0000-0001-8864-2064 2019 , 'Ship roll damping coefficient prediction using CFD' , Journal of Ship Research , pp. 1-16 , doi:

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For a ship undergoing roll motion at a resonance frequency, the roll restoring momentand virtual moment of inertia counteract each other and only the damping momentresists the roll exciting moments. Hence, accurate computation of the roll dampingmoment improves the roll motion prediction. There are several methods to calculatethe damping moment; however, most of them fail to consider the viscous effects, suchas the potential theory–based method. The experimental measurements take intoaccount the viscous effect; however, they are expensive. The Computational FluidDynamics (CFD) method is an alternative to accurately consider the viscous effect. Inthis study, a CFD approach based on harmonic exciting roll motion technique isadopted to compute the roll motion characteristics and damping coefficients atdifferent conditions. The impact of appendages, Froude number, and degrees offreedom on roll motion characteristics and damping coefficients are investigated forthe model scale and full scale to study the scale effects. The results at the model scaleare compared against experimental measurements and good correlation was found.

Item Type: Article
Authors/Creators:Kianejad, SS and Enshaei, H and Duffy, J and Ansarifard, N and Ranmuthugala, D
Keywords: ship roll, angular velocity, damping coefficient, harmonic exciting roll motion, CFD, appendages
Journal or Publication Title: Journal of Ship Research
Publisher: Soc Naval Arch Marine Eng
ISSN: 0022-4502
DOI / ID Number:
Copyright Information:

Copyright 2018 Society of Naval Architects and Marine Engineers (SNAME)

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