Performance Prediction of a Semi-Displacement Luxury Yacht

The study of semi-displacement and planing vessels is an actual topic since the wide applications range, spanning from sport competitions to patrol boats. From a physical point of view, the high speed reached by these vessels implies a complex interaction between the structure and the free surface of the fluid with a complicate wave pattern developed downstream. The impact of the vessel on the water surface during its motion gives rise to a jet formation with a significant air entrapment and bubbles production. Actually the side jet is substantially definable in terms of a spray sheet, the dynamics of which is highly difficult to study both in experimental and numerical approaches. A lateral chine is intended to throw spray to the sides of the hull, to prevent water from rising up the hull sides and to create a smooth ride in seaway; moreover chines with a wide flat area (called chine flats) contribute significantly to create lift in the moving boat.