Comparing azimuthing thrusters and conventional shaftlines for propulsive efficiency of pushboatbarge convoys
Azimuthing thrusters can serve as an interesting alternative to conventional shaftlines. But how does this affect powering performance and efficiency? A RaNS-BEM approach is used to calculate the propulsive performance of both configurations. The flow around the pushboat-barge convoy is computed with our CFD code ReFRESCO for viscous flows, while the propeller flow is calculated using a Boundary Element Method. The calculations are performed with propulsors underneath the pushboat and for open-water conditions to better understand the propeller-hull interaction effects.