Computational Fluid Dynamics, Controllable Pitch Propeller, Thrust, Torque, propeller pitch, blade area, expanded area.

This paper presents the design and simulation of a 4 -bladed controllable-pitch marine propeller for relatively small to mediumsized vessels that enhances both maneuverability and efficiency in diverse maritime operational conditions, using the design basis of a small coastal twin screw passenger ferry. The design process utilized the wageningen B-series standard design chart (B4-70), using the optimum design line to carry out design analysis of the propeller, with detailed mathematical analysis/calculations to derive the propeller geometric parameters, followed by the development and modification of a 3D propeller
model using SolidWorks. The hydrodynamic performance and behavior of the CPP were analyzed using Computational Fluid Dynamics (CFD) simulations across varying propeller pitch angles, enabling the determination of thrust and torque under different operational conditions. The results from parametric studies and optimization indicate that a decrease in the propeller blade tip pitch angle leads to improved efficiency, enhancing propulsion and fuel economy. The simulations also revealed that the maximum ahead thrust was achieved at a pitch angle of -30° from the design pitch, the maximum astern thrust at 60° from the design pitch, and approximately zero thrust at 20° from the design pitch.