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Numerical Prediction of Bow-Flared Slamming on ULCS in Oblique Waves

Bow-flared slamming loads of ULCS in oblique waves were studied systematically. Firstly, relative motion features between ship and wave were analyzed by seakeeping theory. The result shows the transverse and roll motion cannot be ignored in oblique waves. Secondly, a long-term and short-term analysis was applied to obtain the parameters of equivalent design wave. Then slamming pressure of two bow-flared sections with three kinds of motions was predicted by using the Computational Fluid Dynamics (CFD) method in commercial code FLUENT. Pressure characteristics in different wave directions were discussed and the results show slamming loads in some oblique wave cases are larger than that in the head sea. And the torque moment and transverse force caused by asymmetrical pressure distribution on the two sides should be drawn more attention.