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Investigation of scale effects on roll damping through numerical simulations

Citation

Kianejad, SS and Enshaei, H and Duffy, J and Ansarifard, N and Ranmuthugala, D, Investigation of scale effects on roll damping through numerical simulations, Proceedings of the 32nd Symposium on Naval Hydrodynamics, 05-10 August 2018, Hamburg, Germany (2018) [Refereed Conference Paper]

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Abstract

For a ship undergoing roll motion at a resonance frequency the roll restoring moment and virtual moment of inertia counteract each other and only the damping moment resists the exciting roll forces and moments. Hence, accurate computation of the roll damping moment improves the roll motion prediction. There are several methods to calculate the damping moment, however, most of them neglect viscous effects, such as potential theory and strip theory method. The experimental and some of the numerical simulations take into account the viscous effect, however, the experimental measurement is expensive. In this study a CFD approach based on harmonic exciting roll motion (HERM) technique is adopted to compute the roll motion characteristics and damping coefficients in different conditions. The impact of appendages, Froude number and degrees of freedom (DOF) on roll motion characteristics and damping coefficients are investigated for model-scale as well as full-scale to study the scale effects. The results at model-scale are compared against experimental measurements and good correlation was found.

Item Details

Item Type:Refereed Conference Paper
Keywords:angular velocity, damping coefficient, harmonic exciting roll motion, CFD
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
UTAS Author:Kianejad, SS (Mr Seyedsadreddin Kianejad)
UTAS Author:Enshaei, H (Dr Hossein Enshaei)
UTAS Author:Duffy, J (Dr Jonathan Duffy)
UTAS Author:Ansarifard, N (Ms Nazanin Ansarifard)
UTAS Author:Ranmuthugala, D (Professor Dev Ranmuthugala)
ID Code:130764
Year Published:2018
Deposited By:Seafaring
Deposited On:2019-02-11
Last Modified:2019-02-15
Downloads:0

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