ABSTRACT
In this study, a semi-submersible structure is selected as an offshore structure model. This structure is one of the favourite structures used in deep water oil and gas exploration activities. To simulate the motion of a semi-submersible by diffraction potential theory, a programming code was developed and written in visual basic programming language. By comparing the numerical results predicted by using diffraction potential theory to experimental results, it is concluded that the motion prediction by diffraction potential theory has an acceptable accuracy in most cases, except for heave motion when the wave frequency is near to the structure natural frequency (Siow et al. 2013b & 2014a).
