Session: 06-12-04 Ship Hydromechanics IV

Paper Number: 127815

127815 - Experimental Study on Added Resistance in Waves of Klng at Design Speed and Low Speed 

Among global concerns of global warming, efforts are on going to mitigate the rise in global temperatures. In these efforts, the shipping industry has introduced key measures, Energy Efficiency Design Index (EEDI), Existing Ship Energy Efficiency Index (EEXI), and Carbon Intensity Indicator (CII). Accurate prediction of added resistance in waves is essential for EEDI calculations, and this component included significant uncertainty owing to the second-order force generated by difference frequencies. In this study, model tests was conducted on predicting the added resistance of KLNG in the Ocean Engineering Basin (OEB) of KRISO. With a specific focus on determining Minimum Propulsion Power at low ship speeds,  the research focused on model tests conducted at both the vessel's design speed and low speed. The model tests conducted under nine wavelength conditions, a range of wavelength ratios from 0.5 to 1.5. Additionally, three wave height conditions were studied, maintaining fixed H/L ratios to assess the effects of nonlinear wave height. The effects of nonlinear wave height at the design speed was found especially within the radiation-dominated region. On the other hands, investigations on the added resistance at lower speeds, under identical experimental conditions, showed some effects of nonlinear wave height at wavelength ratios of 0.7 or lower, although this influence was not statistically significant. Moreover, the peak wavelength ratio of the added resistance was observed to shift to short wave region depending on vessel speed as the vessel's speed decreased. Notably, the influence of diffraction effects in the added resistance observed in short waves. Additionally, the study investigated on relative wave motion along the hull surface, confirming its significant role as a leading factor on added resistance.

Presenting Author: YONG-JU KWON KRISO

Presenting Author Biography: Name : Yong-Ju Kwon
Affiliation : Junior Technician of KRISO
Experience : KRISO (2013~Present )
Education :
Korea Maritime and Ocean University - M.S. (2011~2013)
Seoul National University - Doctor's course (2022~Present)
Contact information : kwonyj@kriso.re.kr / kwonyj88@snu.ac.kr

Authors:

YONG-JU KWON KRISO
Dong-Min Park KRISO
Bo Woo Nam SNU(Seoul National University)