Abstract
The rotating motion of a ship with zero forward speed is one of the fundamental motions which appear in harbor maneuvers. In order to predict the maneuverability of a ship in harbors, it is necessary to estimate the hydrodynamic forces on the ship hull with the rotating motion. This report presents longitudinal distributions of the lateral forces on a ship hull with the rotating motion, which are obtained from segmented model tests. A comparison is made between measured lateral forces on the segmented model and those evaluated based on the cross flow model. The result indicates that the latter values differ remarkably from the former ones. In this report, a correction factor giving equivalent uniform flow velocity is introduced to modify the distribution of the lateral forces evaluated by means of the cross flow model. It is found that the value of the correction factor increases where the segment element is closer to midship. Judging from the above, it appears that the approach using the correction factor can be applied to improve the estimation accuracy for the moment on a rotating hull.
