The paper examines how interference effects between a pair of closely spaced cylinders influence the fluid forces acting on them in a low Keulegan Carpenter number regime. The forces are characterised by inertia coefficients, and the analysis is based on potential flow theory using a mapping based on bipolar coordinates. The analysis corresponds to the long wave limit. The dependence of the force coefficients on cylinder spacing and radius ratio is illustrated by contour plots, which might be used as design charts to determine the fluid forces on arbitrary configurations of the two cylinders. Results are also given for some representative geometries indicating the effects of wave diffraction on closely spaced vertical cylinders.

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