hydrodynamic design of contra-rotating propeller for the ships

this paper describes a contra-rotating propeller (crp) system to calculate the hydrodynamic characteristics and then design the optimum operational condition to be installed on two different large bulk carriers and vlcc. the method is based on boundary element method (bem) to obtain the hydrodynamic performance of any complicated configuration such as crp system, and then the optimum propeller data is obtained by the systematic method at the design condition. the researchers prepared a software package code, namely spd, which has model mesh generation, solver and numerical output results. the comparison of the propulsive performance was made between the propeller alone and crp arrangement. major finding include optimal agreement between predictions using the numerical code and experimental data for both ships.