Abstract
In this paper, the influence of the body surface on the water impact problem with the trapped air is discussed. It is assumed that the body surface and the water surface can be respecitively expressed by a elliptic paraboloid and a subsequence of circular hollows. Under this assumption, the impact force with the trapped air is investigated in the both cases that the dropped speed is constant and that it varies. Results show that the impact force becomes larger and larger as the steepness of the body surface increases when the elliptic paraboloid falls onto the distorted water surface, and that the effect of the trapped air on the impact force of the model scale is larger than that of the full scale. Result of the dropped speed shows that the trapped air influences the motion of the hull after it hits the surface of the water.
