Interaction and Impact of Floating Bodies

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Interaction and Impact of Floating Bodies

A. T. Chwang / L. Landweber

On the basis of two 1983 OPNAV instructions, S34705A entitled 'U.S. Navy Policy Regarding Arctic Polar Region' and S3470.6 entitled 'U.S. Navy Warfare Program', the U.S. Navy is preparing to operate its surface ships at high latitudes on a routine basis in support of the nation's Maritime Strategy. In addressing these operating requirements, the U.S. Navy must evaluate the ability of its surface ships to fulfill their mission when operating near the ice edge in the marginal ice zone, and when entering an ice covered port with icebreaker assistance. As the Arctic has become a principal strategic location, knowledge and prediction of sea-ice conditions and the ability to cope with them have become essential to the U.S. Navy. The long-term goal of our research project is to investigate the hydrodynamic interactions, including central and oblique impact, between two floating bodies, or between a floating body and a fixed body. The floating body is usually an ice floe, and the fixed body is an offshore structure. Our near-term objectives are to develop a rationally formulated, computer-based analytical model of far-field ice-floe trajectories and near-field hydrodynamic interactions between floating ice floes and offshore structures. The offshore structures considered in the present study would be assumed to have the shape of a circular cylinder. The ice floes would have the shape of a rectangular block, a rectangular cylinder, a circular cylinder, a circular disk, or a sphere. The analysis would be based on the equations of planar motion of an ice floe under the action of external forces due to wind, fluid viscosity, fluid inertia, and the nonuniformity of the flow field due to the presence of the offshore structures.