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Abstract
In this study, numerical calculations were performed to analyze the characteristics of wave drift forces on the 3,000 and 9,000 ton class training ships that have been recently built and operated. The longitudinal wave drift force shows a large value in the areas ⋋/L= 1.0 and ⋋/L =1.5 in the case of the head and bow seas, and shows a relatively small value in the short wavelength. In the case of a short wavelength at an encounter angle of 30 degrees, which is a stern sea, a fairly large lateral wave drift force is acting. The difference in wave drift force between the two ships does not appear to be large. It can be seen that a larger wave drift moment value is acting on the passenger type vessel T/S B in the case of a short wavelength.
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