Research on Bow Slamming Load of Post-Panamax Container Ship

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The size of container ships has been remarkably increased since 1990s. There are several reasons for this phenomenon such as striking increase of the volume of marine transportation in East Asia, alliance of shipping companies to strengthen their competitive business power, rapid modernization of port facilities, etc. This size change of container ships leads to some new problems in naval engineering. One of them is a problem of bow-flare slamming. In the design stage of conventional container ships, a simple design formula based on the damage records of bow flare structures of small and medium sized container ships has been used. However the rapid change of the ship size makes it difficult for the ship designers to apply the design formula to recently appearing very large container ships. In this study a numerical approach to predict the slamming load that is exerted on the bow of large container ships has been studied. In the process of developing 3D numerical method, the numerical program was validated by applying it to a similar impact problem called sloshing since a lot of data for validation were available. After validating the numerical method, it was applied to the bow-flare slamming problem of a Post-Panamax container ship. A series of large scale model experiment were performed, and impact pressure on the bow flare, local wave elevation, green water on deck, ship motion, etc., were measured. Numerical simulations were also carried out and the results of model experiment were examined. The limit of 2D method was realized and the superiority of 3D method was confirmed. Our 3D numerical method is useful to predict reasonably the impact pressure that is exerted on the bow flare of large container ships. We have published 25 research papers that are related to this study.