Global response of a flexible catamaran due to wetdeck slamming in head sea regular waves is studied. A 6DOF structural model is used to model the test catamaran. The catamaran has a wetdeck with horizontal transverse cross-sectional shape. The flow due to the water impact is assumed 2D in the longitu-dinal cross-sectional plane. Both a direct method and a modal based method are applied to predict the global response. Vertical shear forces and bending moments are compared with experimental data and show reasonable agreement. Theoretical and experimental error sources are presented and the influence on global response is discussed.

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