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Calculation of restoring moment in ship roll motion through numerical simulation

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Kianejad, SS, Enshaei, H ORCID: 0000-0002-5649-7015, Duffy, J ORCID: 0000-0003-3484-1345 and Ansarifard, N 2018 , 'Calculation of restoring moment in ship roll motion through numerical simulation', paper presented at the 13th International Conference on the Stability of Ships and Ocean Vehicles (STAB 2018), 16-21 September 2018, Kobe, Japan.

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Abstract

Accurate calculation of restoring moment, virtual mass moment of inertia and damping moment increases accuracy of a ship’s dynamic stability simulation. The current methods of approximating the roll restoring moment are based on hydrostatic calculations. These methods overlook dynamic conditions and the effects of pressure distribution around the body. In the current study, a CFD approach is adopted based on a harmonic excited roll motion method to investigate roll motion characteristics and calculate the restoring moment in dynamic conditions. This investigation considers multiple degrees of freedom (DOF) at different Froude numbers, bare-hull and fully appended conditions. The results show that the restoring moment in dynamic condition is larger than static condition.

Item Type: Conference or Workshop Item (Paper)
Authors/Creators:Kianejad, SS and Enshaei, H and Duffy, J and Ansarifard, N
Keywords: restoring movement, damping moment, weight distribution, VCG, roll moment of inertia, CFD, harmonic excited roll motion
Journal or Publication Title: Proceedings of the 13th International Conference on the Stability of Ships and Ocean Vehicles (STAB 2018)
Publisher: STAB 2018
Copyright Information:

Copyright 2018 the authors

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