Analysis of pressure distribution of bottom and wake of a planning catamaran hull with symmetrical and asymmetrical half-bodies with different intervals of half-bodies with the help of computational fluid dynamics

Interference flow field and surface waves generated by the semi-hulls motion of planning Catamaran, has significant effect on resistance, bottom pressure distribution of the body and loss of energy. Asymmetric planning semi-hulls surfaces generate more than dynamic lift than dead rise hull at the same condition. In this paper, flow around asymmetric planning catamaran semi-hulls in 3D state and two phases by using CFD simulated. Interference effect analysis is carry out by experimental data. In continuance, for interference and surface waves effects, modeling in single and dual semi-hulls state are simulated. For interference effect between asymmetric planning catamaran semi-hulls model test is conducted at the 5 varying tunnel spacing at same conditions. For investigate of lift coefficient and surface waves effects model test is conducted at 18 and 25 dead rise angle and various of trims. For investigate of surface waves sample around asymmetric planning catamaran demi-hulls and interference between, hydrodynamic analysis is carry out for dead rise angle 25 and trim angle 6. There is excellent overall agreement between measured, predicated and numerical lift coefficient over the rang of dead rise angle 18 and 25, speed coefficient 2.8 and 5, various of trim angle for asymmetric planning catamaran demi-hulls.