Development of Ship Hull Optimization Method Based on Computational Fluid Dynamics

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The objective of present research project is development of ship hull optimization method based on Computational Fluid Dynamics. In the two year research project, the numerical method has been developed and applied to improve aft. part of tanker ship without a stern bulb. In this study, stern shape was modified so as to decrease the viscous resistance and increase the propeller inflow at the top of the disc, which results in lowered stern vibration. The present numerical approach includes the Reynolds-averaged Navier-Stokes Equation method to solve viscous flow fields around a ship, the two-dimensional B-spline function to express stern-modification function, the iterative optimization procedure utilizing locally linearized solutions, and the scalar multi-objective function with weight averaging. The numerical results show that the stern form is modified to have characterized V-type frame line if only viscous resistance is minimized. On the hand, the stern-bulb type frame line appears if only propeller inflow at the top of the disc is increased, furthermore, combined type of frame line of above-mentioned was obtained if viscous resistance is minimized and inflow at the top of propeller disc is increased. These results agree well with the experimental data, which had been obtain in circulation water channel.