Experimental Study on Added Resistance in Waves of KLNG at Design Speed and Low Speed

Abstract

In this study, experimental investigations were conducted to estimate the added resistance of KLNG in regular and irregular waves, with a specific focus on the effects of ship speed. A series of model tests were performed in ocean engineering basin of KRISO. The test model, with a scale ratio of 1:69, was towed with a soft spring in a diamond shape and two-axis load cells to measure the added resistance. Experimental conditions were established to examine the added resistance under various wavelength ratios and two ship speed conditions. At the design speed condition, it was found that the added resistance in waves exhibited peak values within the radiation dominant region, while under the low-speed condition, diffraction became more crucial to the added resistance. Additionally, a high correlation was found between added resistance and relative wave motion responses of bow sections. In irregular waves, a discussion was made on a comparison between the results obtained by the direct and spectral methods.