In the previous study, a 2D floating breakwater shape which has an optimal performance, had been obtained. The performance of this shape was also confirmed with a model experiment in towing tank. Moreover, its performance in 3D case was also investigated in subsequent study. However, in order to predict its performance in real application more accurately, it is necessary also to evaluate its characteristics in oblique waves. In this study, the performance and characteristics of the model which are hydrodynamic forces, body motions, wave elevations and drift forces are computed using higher order boundary element method (HOBEM). HOBEM, which is based on the potential flow theory and uses quadratic representation for quadrilateral panels and velocity potentials, can be used to obtain more accurate results using less number of panels as compared to conventional panel method (CPM). The computation correctness is confirmed by using Haskind-Newman and energy conservation relations. From this study, 3D wave effects could be further verified and body motions are shown to be much smaller as compared to 2D case. It can also be noted from the computation results that even though the performance in terms of wave elevations will depend on the measurement positions, but the optimal performance obtained in 2D case could be realized for longer body length.
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