Warp-chine on pentamaran hydrodynamics considering to reduction in ship power energy

Abstract

The proper shape of the ship was resulting lowering shear stress that caused reduction on energy losses in the boundary layer, vortices and flow separation which prevent an increase pressure in the aftbody. Multihull had a much lower resistance components (shear stress and pressure) with the result that requires significantly less horsepower (power energy) than monohull. The total resistance of multihull not only the sum of the individual resistances of each hull. There were interactions between main hull and side hull related to stagger, clearance and speeds. This research was to investigate characteristics of pentamaran based on Michell’s thin ship theory and be adjusted with the experimental on towing test for several configurations on clearance and stagger. The pentamaran with an arrow formation consist of main hull represents a hard chine recommended from Savitsky model and side with V shape, which each of two side hulls located in the same longitudinal. Changing of side hull on clearance strongly affects the resistance characteristics than stagger. The configuration of pentamaran with centerline of the main hull to each of front-side hull approximately 15o-18o could be an effective manner to reduce resistance. In general, thin ship theory from Michell to prediction coefficient component resistance of model with warp-chine yields quite good results with the experiments at Fn > 0.4.