In order to estimate the stress distribution due to slamming of a ship, it is necessary to determine the local pressure distribution accurately. CFD is a promising approach for this purpose, however, a large amount of computational effort is required if a 3-dimensional calculation is adopted. In the present paper, the pressure distribution is estimated by means of a 2-dimensional CFD approach and is modified with the aid of a heuristic method to take account of the 3-dimensional effect in slamming phenomenon of the ship with forward speed in waves. The proposed calculation method of pressure distribution is examined by conducting the structural analysis of the ship and the calculated stress distribution is discussed from the practical point of view.

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