A New Method for Ship Bulbous Bow Generation and Modification

摘要

In this paper, a Computational Fluid Dynamics (CFD) based shiphydrodynamic optimization tool is further developed to generate thebulbous bow for a ship hull. The bulbous bow generation includes threesteps: longitudinal profile formation, transverse remodeling, and bulboptimization. Specifically, the bulbous bow is generated throughsurface deformation based on Radius Basis Function (RBF)interpolation method. The design parameters are length, fullness, andvertical location of a bulb. With respect to different choices of thesedesign parameters in the first two steps, three different shapes of initialbulbous bows are generated: O-type, Delta-type and Nabla-type. Thehydrodynamics performances of the ship hull with the generatedbulbous bow, such as wave drag, sinkage and trim, are evaluated bypotential-flow based fast CFD solver. After a bulbous bow shapeoptimization procedure, a bulbous bow for a ship hull with the besthydrodynamics performance is obtained. The described new method isapplied to three different types of ship hulls, i.e. the Wigely hull, theSeries 60 hull and the Model 5279. Results show that the proposedmethod can be used for bulbous bow generation.