摘要
In this paper, added resistances acting on a hull of non ballast water ship(NBS) in high waves is discussed. The non ballast water ships were developed at the laboratory of the authors at Osaka Prefecture University, Japan. In the present paper, the performances of three kinds of bow shapes developed for the NBS were theoretically and experimentally investigated to find the best one in high waves. In previous papers, an optimum bow shape for the NBS was developed in calm water and in moderated waves. For a 2 m model for experiments and computations, the wave height is 0.02 m. This means that the wave height is 15% of the draft of the ship in full load conditions. In this paper, added resistances in high waves up to 0.07 m for a 2 m model or 53% of the full load draft are investigated. In such high waves linear wave theories which have been used in the design stage of a ship for a long time may not work well anymore, and experiments are the only effective tool to predict the added resistance in high waves. With the computations for waves, the ship is in a fully captured condition because shorter waves, λ/Lpp<0.6, are assumed.
In this paper, added resistances acting on a hull of nonballast water ship （NBS） in high waves is discussed. The nonballast water ships were developed at the laboratory of the authorsat Osaka Prefecture University, Japan. In the present paper, theperformances of three kinds of bow shapes developed for the NBSwere theoretically and experimentally investigated to find the bestone in high waves. In previous papers, an optimum bow shape forthe NBS was developed in calm water and in moderated waves. Fora 2 m model for experiments and computations, the wave height is0.02 m. This means that the wave height is 15% of the draft of theship in full load conditions. In this paper, added resistances in highwaves up to 0.07 m for a 2 m model or 53% of the full load draftare investigated. In such high waves linear wave theories whichhave been used in the design stage of a ship for a long time may notwork well anymore, and experiments are the only effective tool topredict the added resistance in high waves. With the computationsfor waves, the ship is in a fully captured condition because shorterwaves, λ/Lpp〈0.6, are assumed.
