Research on the Influence of Twin-Bow Appendage with Drum on Ship Speed and Resistance

Speed and Resistance are very critical general parameters for ship hull forms design. Reducing resistance is one of the main methods for obtaining higher speed. Optimal hull form contributes a lot to the resistance and wave-making of a vessel. In recent research, the effectiveness of resistance reducing by twin-bow appendage for monohull ship has been paid high attention. The twin-bow appendage has been developed for high-speed monohull vessels to reduce the resistance. However, for some monohull ships such as monohull with bulbous bow it is impossible to deploy twin-bow appendage since it is necessary to consider the load capacity of bulbous bow. For exploring the applicability of twin-bow appendage, a twin-bow appendage with drum is proposed for replacement of bulbous bow in this article. The hydrostatic resistance of normal vessel with bulbous bow and that of twin-bow appendage with drum will be analyzed and compared by numerical simulation. RANS equation is applied for numerical computation and the CFD tool Star CCM+ is used for simulation.