In this paper, a systematic method to design marine ducted propellersis presented for a given duct shape and design conditions to achieve thehighest efficiency while avoiding cavitation. The duct is solved by the2D-axisymmetric Reynolds-Averaged Navier-Stokes (RANS) methodand the propeller is designed and analyzed by potential flow methods(lifting line method and vortex lattice method). The initial propelleris designed based on the optimal loading from the RANS/lifting linemodel interaction method. A nonlinear numerical optimization methodis used to refine the propeller in the effective wake (defined as thedifference between the total velocity and the propeller induced velocity),with constraints to avoid cavitation for a given cavitation number. Eachdesign is analyzed in a previously-developed and validated RANS/vortexlattice method interaction model to check if the optimization objective isachieved.
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