numerical and experimental hydrodynamic analysis of catamaran with and without v-like center bow

Catamaran added v-like center bow (incat) is investigated as a wave piercing vessel to decrease vertical acceleration and diminish slam events during sea-keeping operation. the catamaran and the vessel bow were modeled and the vertical acceleration of the model was validated with experimenal test. the effect of using a v-like center bow for a catamaran vessel was explained numerically and experimentally considering two degrees of freedom of vessel motions. the results confirm the accuracy of the numerical model. thus, the center bow geometry terms such as slope and elevation of the center bow from demi-hulls were optimized. the effect of three different slopes of the center bow, of models 1, 2, 3, on vertical acceleration were compared numerically and, thus the mild slope of 40 degrees was selected due to lower vertical acceleration. the geometry of v-like center-bow such as the slope of the center bow and elevation from demi-hulls was optimized numerically in the case of 3 different slops of the bow model. considering different center bow elevation of 9.5 and 49.5 mm, the pressure contour of the incat vessels was compared numerically. the optimized incat vessel, and the catamaran vessel were tested in towing tank at two significant wave heights of 11 and 17 cm. thus hydrodynamic parameters such as vertical acceleration, heave, and the resistance forces were measured and compared. the results show there is no slamming at a wave height of 11 cm but it occurs at a wave height of 17 cm.