Peak Distribution of Random Wave-Current Force

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Abstract
When waves encounter current, characteristics of waves, wave field kinematics, and fluid force undergo changes. Evaluation of fatigue damage of marine structures in random fluid field requires knowledge of peak distribution of fluid force. This paper examines the influence of wave-current interactions on peak distribution of fluid force on an element of a cylinder in a random, Gaussian, zero mean, stationary deep-water gravity wave field under the influence of a steady current. The influence of Gaussian assumption of fluid force on its peak distribution is also studied. Results are obtained and presented graphically for a 40 mph wind for current speeds U = O (no current), U = 3 fps (concurring current), and U = –3 fps (adverse current). When current is present, comparisons are made between the cases when wave-current interactions are considered and ignored. It is shown that interactions have pronounced effects on the peak distribution of fluid force especially in adverse current. Furthermore, Gaussian assumption of fluid force is decisively unsatisfactory.

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