A research on numerical prediction method for wave-making resistance and its application to container ship hull form optimization

The container ship is a kind of ship with medium or high speed,its wave-making resistance covers a great proportion of the total resistance.Under certain circumstance,hull form optimization is to look for the ship with lowest wave-making resistance.In this paper,two methods based on potential theory are developed to calculate wave-making resistance of container ship: one is the improved Dawson method,traditional Dawson method uses double model streamline grids on the undisturbed water surface,while the improved Dawson method uses body fitted grids;another is single model flow method.Both methods simulate the wave-making phenomena by Rankine sources distributed on hull surface and free water surface.Furthermore,the two methods are applied to calculate wave-making resistance of two container ships.Comparison to experimental data shows that both methods can correctly distinguish the influence of hull form change on wave-making resistance within the some scope of design speed.It can be concluded that the two methods are applicable to hull form optimization.But the calculation results of improved Dawson method are closer to experimental data,so it is more suitable for hull form optimization.