An integral equation approach is utilized to investigate the influence of tank walls on the hydrodynamic forces experienced by an arbitrary three-dimensional body situated in a narrow wave tank. An appropriate three-dimensional Green function which satisfies the tank-wall boundary conditions is developed to facilitate the solution. Numerical results are presented for truncated cylinders of circular and elliptic cross section which illustrate the effect of the tank walls on the wave-induced forces. The numerical results indicate that the hydrodynamic loads on a three-dimensional body in a narrow tank may be quite different from those on the same body in the open sea.

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