When an extreme wave crest hits the deck of a jacket-type structure, the kinematics in the wave beneath the deck is strongly influenced by the deck itself. The increased fluid particle velocities should be accounted for when assessing the load on obstructions located in a zone below the deck, i.e. on the upper part of the substructure and on under-deck attachments. Usually the wave-in-deck loads and substructure loads are calculated separately by two different analysis programs. The undisturbed velocity field is then applied to the substructure. In this study, we compare two methods, both based on CFD (Computational Fluid Dynamics), for calculating the increased substructure loads due to disturbed fluid particle velocities during extreme wave-in-deck events.

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