NUMERICAL AND EXPERIMENTAL EVALUATION OF THE HULL CHARACTERISTICS OF TWO-SEMI-DISPLACEMENT FAST MONOHULLS

Publisher Summary This chapter considers two semidisplacement monohull types: a round bilge type and a hard chine hull, as suggested by the 1986 ITTC Committee. For the experimental evaluation, two models were constructed in FRP. To compare the results both hull forms are developed in CAD and discretized and the resistance components evaluated with the software SHIPFLOW. The numerical procedure gives an estimation of the sinkage, trim, and wave resistance component, whose values were compared with the experimental ones. One important conclusion is that the numerical procedure is extremely powerful for the preliminary choice of the hull form. The possibility to choose the optimum stern wedge angle and the position of the bilge keel are useful design tools. For the absolute estimation of the ship's resistance, it is necessary to make use of experimental results; however, the use of the correction factor of the same magnitude for both vessels permits a first estimation.