Numerical simulations of ship motions in long-crested and short-crested irregular waves by a 3D time domain method

The predictions of ship motions in real sea become more and more important at present.In this paper,based on the time domain method for predicting ship motions in regular waves,the numerical models for long-crested and short-crested irregular wave are established.The motions of a 100000DWT tanker in long-crested and short-crested irregular waves were computed by the present method,the numerical and model tests results are compared and analyzed,the results show that the present method can well predicting the ship motions in long crested irregular waves.Then,the simulations of this tanker in short-crested irregular waves were carried out by the present method,the comparisons of computed results in long-crested and short-crested irregular waves show that the ship motions are influenced significantly by the short-crested irregular waves.