Analysis of the effect of addition of stern flaps on the performance of 60 m fast boat

Abstract

Regulations from the International Maritime Organization (IMO) regarding energy efficiency mean that the ship design must have the least possible resistance so that fuel consumption is also low. Several modifications to the shape of the hull have been developed so that the performance of the ship can be improved so that its use is more efficient. The stern flap is a modification of the hull shape by adding an appendage to the lower transom. The application of the use of a stern flap can improve the movement of ships that are too heavy behind, causing the ship to have a tendency to trim the stern, increasing hydrodynamic work and reducing the obstacles that work while the ship is operating. This study analyzes the effect of adding an appendage to the stern in the form of a stern flap on the performance of fast boats using a computer program based on Computation Fluid Dynamic (CFD). This study was conducted by comparing the results of the analysis of the original model, namely without adding flaps with variations in the addition of flaps at the stern of the ship. Based on the analysis results, obtained an increase in ship performance for each stern flap variation compared to the original model. Flap V model with a flap length of 2% LPP and a Trailling Edge Down (TED) angle of 90 is the best variation. The total resistance value at each speed has a better decrease. Compared to other models, the total resistance of the ship is reduced by 5.53%.