This paper gives comparisons of numerical predictions with seakeeping model tests for R/V Melville, an oceanographic research vessel that is propelled by two ducted azimuthing propellers. The model tests were conducted on a 1/23 scale model that was controlled by a human pilot using a remote control. The ship motions were predicted using the ShipMo3D ship motion library, which uses potential flow theory to determine hull radiation and diffraction forces. Predicted roll and pitch motions give good agreement with model tests. Predicted yaw motions and azimuthing propeller deflection angles are much less than values observed during the model tests. Challenges with prediction of yaw and azimuthing propeller deflection are likely due to approximation of the human model pilot with a simple proportional-derivative (PD) autopilot. The comparisons between numerical predictions and model tests suggest that the azimuthing propellers have minimal influence on roll for R/V Melville.

This content is only available via PDF.
You do not currently have access to this content.