This paper presents a numerical study on motion characteristics of a Tension Leg Platform (TLP) in waves. Time-domain simulation using convolution integral is applied to investigate the wave-induced motion response of the TLP. Hydrodynamic coefficients and wave forces are calculated using higher-order boundary element method (HOBEM) based on potential flow model. Viscous drag force acting on hull and tendon is included by using Morison's formula. Firstly, simulation results of wave-induced motion are validated by comparing with experimental data. Focus is made on nonlinear effect of viscous force on the TLP motion such as springing and ringing responses. Discussion is also made on surge drift motion of the TLP due to viscous drag force and Froude-Krylov forces.

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