Drag decomposition and realistic prediction of transom-stern monohull ships

A practical decomposition of the pressure drag for the transom-stern monohull ships is proposed here, where the pressure drag is decomposed into four different components, including the hydrodynamic drags C-S(*), C-TS* for the side surface or the wetted transom-stern surface, the hydrostatic drags. C-TS(dry), C-TS(wet) for the unwetted or wetted transom-stern surface. The influence of the transom-stern on these drag components are researched here, and practical approaches to predict these drag components are subsequently proposed. This research finds that accurately predicting the unwetted height eta(dry) at low Froude numbers, which is usually thought unimportant in the conventional researches, is actually important for the drag prediction.