Numerical and Experimental Prediction of the Inherent Course Stability of High Speed Catamaran in Deep and Shallow Water

摘要

The paper treats the important problem of prediction of ship's inherent course stability, based on a large amount of model experimental data for a specific object - the Delft catamaran 372, in a wide range of Froude numbers and depth to draught ratios. The analysis is done within the frames of the linear maneuvering model. Dependency of the stability criterion on Froude number and the water depth to draught ratio is established and clearly demonstrated. The second part of the paper deals with the numerical prediction of the stability criterions by means of CFD simulations. It is demonstrated that the CFD solver chosen for the study, namely CFDShip-Iowa, can predict reliably the hydrodynamic flow patterns and properties of the studied ship model, as well as the hydrodynamic derivatives, in particular.