A Computation Fluid Dynamic (CFD) analysis procedure is demonstrated for estimating the ringing loads on an offshore structure modeled as a simple vertical cylinder. The procedure is based on the Euler Overlay Method, where the computational domain of CFD solution is minimized to the immediate vicinity of the structure by overlaying Euler solution defined in the outer domain. The simulated ringing load shows good agreement with experimental data. Dynamic amplification factor due to the simulated ringing load is investigated for different damping ratio and natural frequency of the structure. Ringing response due to breaking wave shows significance of ringing load when evaluating dynamic amplification of wave load.

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