THE INFLUENCE OF TRANSOM IMMERSION ON NPL HULL DRAG USING SHIPFLOW

Abstract

The transom immersion on the ship can influence the ship resistance. Therefore, it is important to investigate on the amount of drag that contributed from different transom immersion. For this research, all the design is a NPL mono-hull ship. The hull was selected from the MAX SURF library. The collected data were used as benchmark for validation purposed and comparison with the result that researcher obtained from Computational Fluid Dynamic (CFD).This project will use Computational Fluid Dynamic (CFD) software to simulate the resistance or drag of the ship. This project will use the FLOW TECH SHIP FLOW 6.03 for the study. The simulation in this research was done using CFD (SHIP FLOW). In SHIP FLOW, the configuration was set up using COURSE, WTRAN and FSFLOW. The configuration was conducted using this setting. The result was obtained when the computational simulation has completed. The obtained result was tabulated and a graph was plotted to perform Grid Independence Study (GIS). This study analyzed of different transom immersion ratio AT/AX at 0.5, 0.7, 0.8 and 1.0. The model or the hull form chosen for this study is the NPL Round bilge archived from MAX SURF library. The Computational Aided Design (CAD) Rhinoceros 5 was used for the re-design transom area. At the end of project, the best transom immersion ratio was at 0.5 because it produces the lowest total resistance. The highest total resistance was produced by transom immersion 1.0. The total resistance increases as the transom immersion increases. The total coefficient increases as the transom immersion ratio increases. The higher the transom immersion, the higher the wave making made by the model.