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Estimation of added mass moment of inertia in roll motion through numerical simulation

Citation

Kianejad, SS and Enshaei, H and Ranmuthugala, D, Estimation of added mass moment of inertia in roll motion through numerical simulation, PACIFIC 2017 International Maritime Conference Proceedings, 3-5 October 2017, Sydney, Australia, pp. 1-15. (2017) [Refereed Conference Paper]


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Abstract

Dynamic ship stability is an important subject in the field of Naval Architecture due to lack of understanding may result in extreme roll motion. Direct investigation of dynamic stability modes such as parametric rolling is possible through the CFD analysis but is costly due to the long simulation time, while other numerical methods like panel methods can speed up the process. Success in using these methods depend on the solution of motionís equation and accurate estimation of each term including mass moment and added mass moment of inertia, damping and restoring moments. At the present time, there is a lack of precise estimation of added mass moment of inertia, which is usually accounted for 10-25% of mass moment of inertia. This paper presents an innovative method to calculate added mass moment of inertia by exciting a ship model through series of harmonic moments using CFD simulations. At maximum roll angle, where the acceleration is maximised and angular velocity is zero (damping moment is negligible), the total moments are measured. By ascertaining the restoring and harmonic excited moments momentarily, the added mass moment of inertia could be determined with greater accuracy. In this investigation and for the purpose of analysis, the influence of forward speeds, coupled heave, pitch and roll motions, and various encounter frequencies are taken into account.

Item Details

Item Type:Refereed Conference Paper
Keywords:added mass moment of inertia, CFD, harmonic excited roll motion, coupled motion
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Naval Architecture
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in Engineering
Author:Kianejad, SS (Mr Seyedsadreddin Kianejadtejenaki)
Author:Enshaei, H (Dr Hossein Enshaei)
Author:Ranmuthugala, D (Professor Dev Ranmuthugala)
ID Code:122700
Year Published:2017
Deposited By:Seafaring
Deposited On:2017-11-23
Last Modified:2018-01-15
Downloads:0

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