Aero-Hydrodynamic Interactions for Wind Powered Ships: 
Retrofit of a High-Speed Mega RoRo Vessel 

Aero-Hydrodynamic Interactions for Wind Powered Ships:
Retrofit of a High-Speed Mega RoRo Vessel 

This study evaluates the retrofit of a high-speed RoRo vessel with rigid wingsail wind propulsion, 
focusing on aero-hydrodynamic interactions and real-world performance. A validated lifting line 
model, enhanced with CFD-derived ship-sail interaction effects, is coupled with a dynamic vessel simulation environment. Using operational data from HUMBRIA SEAWAYS, we simulate fuel savings and vessel response across realistic voyages. Results show median fuel savings of 16% at 18 Knots, with effective course-keeping and no major operational penalties. The findings support the viability of wind propulsion retrofits for fast RoRo ships operating on consistent, wind-exposed trade routes.