Experiment on added resistance in short waves

摘要

Added resistance of KVLCC2 ship in short and head regular waves with three different bow shapes has been studied theoretically and experimentally. The model tests with different bows are performed to check how well the asymptotic formula (Faltinsen et al., 1980) captures the effect of the bow geometry on added resistance, and to establish the typical level of added resistance in short waves. Considering the fact that the asymptotic formula neglects the effect of ship motions, it is combined with theoretical methods to calculate added resistance in long waves by an R function (Fujii and Takahashi, 1975) to predict the added resistance in the intermediate wavelength region where both ship motions and wave reflection matter. A unique feature of this experiment is that the ship models are divided into three segments to explore the added resistance distribution in respect to ship segment. Moreover, this paper discusses the sensitivity of the results to the quality of the incident regular head waves and different approaches for measuring and analyzing the experimental data of wave amplitude and added resistance. A novel procedure for carrying out and analyzing added resistance is described. Finally, experimentally determined added resistance of KVLCC2 with three different bow shapes at different Froude numbers is compared with theoretical results.