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Abstract
The problem of interaction among fixed multiple floating cylinders in waves and currents is considered. The current velocity is assumed to be small. The problem is linearized based on a small parameter tau= U/g. Problems of different orders are solved for a single cylinder to determine the diffraction property of the cylinder, which gives the relationship between the incident wave amplitude and the diffracted wave amplitude. The results are then applied to the problems of multiple cylinders. The interaction among cylinders is represented by some additional incident waves emitted from the other cylinders towards the one under consideration. After solving the velocity potential near each cylinder, the hydrodynamic forces can be calculated by integrating the pressure along the wetted surface of each cylinder. It is found that current and steady potential have a strong effect on the wave-drift damping force. Also given is a procedure to evaluate the wave-drifting damping which plays an important role in the slow drift oscillation of moored ocean structures.
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