Numerical study of the effect of interceptor on the longitudinal stability of Mono-hull high speed craft

High speed crafts by planning hull suffer from longitudinal imbalance or porpoising due to the lack of lift control systems. One of the lift control systems is interceptor, which is used as a piece attached to the craft to create balance and trim control. This piece is attached vertically in the stern that is very effective and efficient. Its effect on the lift force and the craft resistance is such that it can adjust the center of pressure to the center of mass and control the craft trim. In this paper, the hydrodynamic performance of a craft in the presence of an interceptor as well as without an interceptor is analyzed based on the computational fluid dynamics (CFD) methods. Craft simulation and interceptor addition were done by Rhino software. Numerical simulation and numerical analysis and analysis of the results were performed by STAR CCM + software. The modeled craft has two degrees of freedom in the direction (heave and pitch) and is solved using the overset method. The results presented in this paper include flow distribution on the craft floor, pressure distribution, trim and drag. The results show that the craft in the presence of the interceptor with a height of 1 mm at a speed of 8 meters per second has the best performance, constant trim and good resistance and will be without porpoising. Compared to a craft without an interceptor whose performance is not suitable,