Analisis Hambatan dan Lift Force dari Modifikasi Step Hull pada Speed Boat Menggunakan Metode CFD

Abstract

The addition of a step hull to a planning hull ship will be better and can reduce the wet surface area, improve hydrodynamic performance resulting in less resistance. Computational Fluid Dynamics (CFD) is a method for calculating and approximating fluid flow numerically using a computer. The resistance value in the 180° step hull variation and 150° step hull variation experienced a decrease in the resistance value compared to the existing model at all speed variations. This happens because the step hull can reduce the wet surface area so that the resistance value is reduced. The largest decrease in resistance value occurred in the 180° hull step variation with a decrease percentage of 2.37%. The ship resistance on existing ships is 86.54 kN, the 180° hull step variation is 84.49 kN and the 150° hull step variation is 85.43 kN at a speed of 20 knots. t the lowest lift value occurred on the 180° step hull variation with a lift value of 46.13 kN, while the highest lift value occurred on the existing one with a lift value of 117.35 kN. Based on the simulation results of a speed boat with step hull modifications, the 180° step hull variation shows the highest reduction in drag and lift.