Comparative Analysis of Warp-Chine and Wigley Shapes 0n Resistance Assessment of a Pentamaran
Keywords:Pentamaran, wave resistance, wave pattern, wave interference
This paper investigated the effect of the shape diversity of hulls and their positions to wave resistance, wave interference, and far-field wave patterns of a pentamaran. The investigations were using experimental and application of design tool based on Michell’s thin ship theory on the various clearances and stagger. The models used a hard chine hull, typically for a planning ship that recommended by Savitsky, and another one, Wigley. Comparison of calculations and experimental was not satisfactory, especially at Fn below 0.5, possibly due to viscous factors were still influential at low speed where the theoretical incapable of predicting the valuable. Based on Michell calculation, the deviation of both wave and interference resistance between the two models was to 36.6%, 58.3%, respectively, with the warp-chine model had lower wave resistance than Wigley. The experimental results exhibited that the wave component of all models has decreased with rising of stagger at Fn> 0.5. The deviation in average between test and calculation of tool on wave resistance for Wigley of 8.25% and warp-chine by 11.8%. Furthermore, the differences of farfield wave patterns between two models had been illustrated by the computational tool on the sectoral patch of the aft of the ship.