Experimental Investigation into the Resistance Components of Displacement Trimaran at Various Lateral Spacings

Abstract An investigation into the breakdown of resistance components of a displacement trimaran was carried out experimentally using a towing tank. A trimaran model consisting of one main-hull with length of 1.2m and two symmetric side-hulls with length of 0.5m was tested at various configurations between Froude numbers of 0.15 and 0.27 at various lateral spacing (S/L) between 0.2 and 0.5. The experimental investigation was conducted using a towing tank belongs to Institute of Technology Sepuluh Nopember (ITS) at Surabaya. Individual test on each part of trimaran hull was also carried out in order to clarify the interference phenomena between the hulls more clearly. Overall results indicated that the wider the hull separation, the smaller the interference between the hulls. The widest separation (S/L=0.5) indicated that there is nointerference between the hulls and this is in good agremeent with individual test of each hull when interference is neglected.

Keywords trimaran, resistance, tank test, CFD, separation, interference

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