Development of computer codes to predict the wave loads and the response of ships and offshore structures in waves

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Objectives of our research are :1. Derivation of a theoretical method, which is based on correct modelling and reliable in accuracy, to predict waveﾟCload, wave impact pressure, the effect of sea water on deck on ships and offshore structures in rough seas.2. To develop a computer code to simulate various responses of ship and offshore structures at consistent accuracyﾟCbased on theoretical modellings developed in 1.Summary of the main results :1. We developed a computer code to compute finite amplitude motioms of high speed vessels in rough seas. TheﾟCmathematical model for this code is 2.5D theory combined with weak scatterer assunption. This modelling has aﾟCbenefit to let the computation more consistent and robust.2. A full nonlinear formulation of the 2D flow around a cylindrical body in high waves was provided. Mixed Eulerian-Lagrangia approch was utilized in the time domain. We completed a computer code based on this approch and are continuing the effort to incooporate this code in 2.5D code for the high speed vessels. It will complete our plan to obtain a computer code to simulate accurately ship motions in rough weather.3. We developed a mathematical theory and a computer code based to predict hydroelastic responses of large offshore structures in waves4. We confirmed accuracy of our mathematical model of wave impact pressure generated by the pitch motion of ships in high waves with experiment.5. We found that fully theoretical prediction of dynamic process of sea water entering on deck is not easy with the capability of available compiuters ; a semi-empirical approch to this problem is useful to develop a simulation code.