Analysis of Bow Shapes Proposed on a High-Speed Displacement Hull

Abstract

This study uses the computer fluid dynamic (CFD) software to compare the resistance between six different bow shapes for a high-speed displacement hull – type NPL. To begin, the original forms of a conventional shape hull are compared between the resistance results from tank test measurements with the CFD results. Then, six bow shapes are also proposed and analyzed, including a bulbous bow, wave piercing bow, axe bow, modified axe bow, and reverse piercing bow; these shapes are sized according to analytical and experimental recommendations. At final on this research, a new hull bow shape is proposed: by adding a ballast bulb to the axe bow to improve ship performance. The CFD resistance calculation is performed for calm water, while for the sea condition is considered added resistance estimation, calculated from seakeeping analysis. A predictive resistance analysis has been performed to show ship behavior and compared with the CFD results. Finally, the seaworthiness analyses of the models are calculated using strip theory to compare the ship comfort and performance of the six studied models.