Pre-Swirl Ducts, Pre-Swirl Fins and Wake-Equalizing Ducts for the DTC Hull: Design and Scale Effects

A pre-swirl fin (PSF), duct (PSD) and wake-equalizing (WED) energy-saving devices (ESD) are designed for the Duisburg Test Case (DTC). To this aim, a simulation-based design optimization method, combining RANSE analyses (ship resistance) with BEM calculations (unsteady propeller performances) in simplified process realized through parametric description of ESD geometries, was employed. Fully resolved were used to validate outcomes affordable process, which identifies capable saving energy delivered power type challenging test case by up 2.6%. Comparisons model-scale calculations, furthermore, permit us discuss influence each appendage different flowfields (model- full-scale, as well under action or propeller) reliability full-scale extrapolation methods recently proposed these types devices.