This paper presents a selective review of research on riser interference between two circular cylinders of equal diameter exposed to a steady current, focused on the oscillation amplitudes and force coefficients of the cylinders. The WIV (wake-induced vibration) of the downstream cylinder is discussed. When the upstream cylinder is free to oscillate, the upstream cylinder's VIV (vortex induced vibrations) affects the response of the downstream cylinder. The recent experimental studies related to this topic are reviewed. The methods to reduce the riser interference and to predict the probability of riser collision are presented.

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