Validation of slender-body method for prediction of linear manoeuvring coefficients using experiments and viscous-flowcalculations

This paper presents the validation of the prediction of linear manoeuvring coefficients by a state-of-the-art fast-time simulation model by using the results of viscous flow calculations and experimental values. The simulation model is of the modular type in which forces on the hull, propellers, rudders and other appendages and their interactions are described separately. The linear forces on the hull are modelled using a semi-empirical method often referred to as the slender-body method. According to this method, the linear manoeuvring coefficients are determined by the rate of change of fluid momentum along the length of the ship. Only a few empirical parameters are used and these can be validated and improved using viscous flow calculations. In this paper, details of the slender-body method and comparisons with viscous-flow calculations and experiments will be presented.