Comparison of Second Order Analyses on a Moored Semi-Submersible Motions in Waves

Abstract

A survey of computer simulation results of slow drift oscillations on a moored semi-submersible in regular wave groups and irregular waves is presented. Calculation methods used by each participant for the second order wave forces, damping as well as the first order hydrodynamic forces on a semi-submersible are examind. Fifteen different results are compared and it is found that the correlation between the computed results and the measured ones is kept within the acceptable bounds when the appropriate value of viscous damping is taken into accounts in the computation.