A nonlinear time-domain theory of ship motion in combination of a generalized Wagner solution, for predicting impact loads on wet-deck of a high-speed catamaran in irregular waves is developed. The method to predict ship motions, impact velocity and wave elevation are based on a nonlinear 2(1/2)D method. The interaction between the steady and the unsteady flow is included in the numerical analysis. The impact load due to wet-deck slamming can be estimated by a generalized Wagner theory and a simple momentum theory. It is pointed out the momentum theory is an approximated solution. Numerical results have been presented for a catamaran hull both with and without center bow. The impact loads and pressure distribution on the center bow and flat wet-deck are estimated.
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