The growing application of catamaran planing hulls implies the significance of comprehensive studies on different aspects of these types of vessels. In this context, slamming is an important phenomenon which is generally simplified to the wedge water entry of the planing hulls. In the present paper, the constant speed water entry of twin wedges, as a simplification of a planing catamaran hull, is numerically modeled at three deadrise angles and five demi-hull separations. Control volume-based finite element has been used to solve two-dimensional Navier–Stokes equations coupled with volume of fluid method for two-phase flow modeling. The results of numerical method have been validated against experimental data. It has been illustrated that low demi-hull separation causes an increase in the impact forces by up to 19%, an effect which decreases rapidly with an increase in demi-hull separation. The obtained results also indicate that secondary impact forces between and outside the hulls are asynchronous due to the reciprocal effects of demi-hulls. Moreover, spray characteristics have been defined and it has been demonstrated that the height of spray between hulls decreases by a decrease in the demi-hull separation.

Parametric investigation of the effects of deadrise angle and demi-hull separation on impact forces and spray characteristics of catamaran water entry

The water entry of two-dimensional body with flow separation is simulated based on potential theory and boundary element method. The double point model and four-order Runge-Kutta method and jet-cut model and free surface smooth technique and regrinding technique are used to assure the stability and accuracy of the numerical result. A flow separation model is introduced to simulate the water entry of two-dimensional body with knuckle. The free surface elevation and pressure distribution of wedge with knuckle are predicted and compared with other theory result. Good agreement between numerical result and other theory result is indicated that the numerical method is stability and effective.

Numerical Simulation of the Water Entry of Two-Dimensional Body with Flow Separation

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Numerical Simulation of the Water Entry of Two-Dimensional Body with Flow Separation