Based on a quadratic boundary element method, our in-house computer program DIFFRACT has been developed to allow the calculation of non-linear wave forces and wave run-up around an arbitrary fixed or moored ship. Regular waves and uni-directional and directionally spread waves can be treated in a computationally efficient manner. A wide range of benchmarking tests in unidirectional and directional waves have been performed to validate the scheme. The non-linear interaction of steep waves with an FPSO is discussed first in this paper. The significance of wave directional spreading on mean-drift forces is then addressed and discussed.
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