Effect of ship motions on added resistance in regular head waves of KVLCC2

This paper employs an experimental method to investigate the impact of ship motions on added resistance for KVLCC2 advancing forward in 14 regular head waves. The model tests have been conducted at Pusan National University's towing tank. The model is free or fixed to surge. The wave length ranges from 0.3LPP to 1.9LPP. In the case of λ = 0.6LPP, three more wave steepnesses and surge-fixed conditions have been taken into consideration. The wave elevation, surge, sinkage, trim and resistance have been measured. The measured data are filtered using moving-average-filter method. The filtered data have been analyzed by using the Fourier series. The mean values and phases of the total resistance in waves are nearly the same as at the surge-free and -fixed conditions. The magnitude of the added resistance is influenced by that of the bow relative motion. The phase of the added resistance shows similar trends to those of the surge and bow relative motions. The non-linearity of the added resistance increases in tandem with the wave steepness, although the RAOs of ship motions show linearity.