Computational Investigation into Bilge Keel Effect on a Traditional Phinisi Boat’s Resistance

Abstract

The paper presents the application of a passive stability system in traditional Phinisi boats equipped with bilge keels, raising concerns about potential resistance increment. Employing a Computational Fluid Dynamics (CFD) approach, the study assesses resistance values connected to bilge keel usage. The investigation focuses on the influence of bilge keel slope angles at various forward speeds. The results show an average 11% rise in total resistance with bilge keels. A comparison of baseline without bilge keel and two alternative cases of 15-degree and 25-degree angles bilge keel positions, reveals significant variations in heave and pitch conditions, resulting in a 1.87% draught reduction and 2.37% positive trim by stern. The study recommends judicious bilge keel geometry and placement to effectively manage resistance, maintaining operational safety and performance efficiency in traditional Phinisi boats.