A numerical study on estimation of ship performance under actual sea conditions considering added resistance and power of various wave conditions

초록

The performance of ships has been studied extensively, primarily under ideal conditions such as calm water. However, in real sea environments, external disturbances such as wind and waves are present. Estimating ship performance under actual sea conditions is essential for improving the operational efficiency and designing hull forms that account for realistic maritime conditions. This study evaluates the added resistance and minimum required propulsion power using computational fluid dynamics (CFD) to estimate ship performance under real sea conditions. The added resistance and self-propulsion performance are analyzed for both regular and irregular waves using CFD, and the irregular wave conditions are evaluated using direct numerical calculations and a spectral method. In addition, irregular wave conditions are analyzed by considering both long- and short-crested irregular wave scenarios. Added resistance calculations are conducted under head and oblique regular wave conditions to account for the directional effects of short-crested irregular waves. Finally, the recent regulations outlined by the International Maritime Organization (IMO) for the minimum required propulsion power are applied to estimate the power requirements for irregular waves, and the required power is compared across different estimation methods. This research aims to estimate the added resistance and required power of ships considering actual sea conditions. The results highlight the importance of accounting for the added resistance and self-propulsion factors in waves for accurate ship performance evaluation.

키워드