Development of a Method to Calculate the Propulsive Performance of a Ship

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1. As one of Rankine Source methods, we developed Kyushu Univ. method, which brings the stable and accurate wave flows. Applying that method to the problem of the propulsive performance of a ship, we elucidated the effects of the free surface on the propulsive performance of a ship.2. We carried out the resistance and self-propulsion tests and measurements of flow fields around the sterns of model ships named wigley and SSPA 720 hulls. Then we obtained the propulsion factors and equal wake-contour lines.3. We developed the calculation method of viscous flow around ship hull based on the potential flow and the boundary layer approximation. The calculated results agree well with experimental ones.4. By applying interatively5. We developed the simple calculation method to obtain the characteristics of the full scale propeller and explained the scale effect on propeller characteristics.6. We developed the program code to calculate the propulsive performance of twin screw ship and elucidated the mechanism of interactions among the hull, twin propellers and twin rudders.