Hydrodynamic Performance Optimization of Ship Hull’s Forebody

Based on Rankine Source Method，the paper introduced SHIPFLOW as computing tool，and also combined FRIENDSHIP-Framework which used as integration platform of CAD-CFD to study the minimum wave resistance hull body design.And total resistance was tested.W e chose Wigley hull as the study object and calculated the wave resistances under different Fr conditions.The results were in good agreement with the experiment data.During the optimization process，we chose a new Wigley hull with a bulbous bow generated by the Feature function of FRIENDSHIP-Framework as original hull type，wave resistance as the objective function，displacement as the constraint condition，parameters controlling the shape of the bulbous bow as the basic design variable，and took Design of Experiment(DOE)method as the optimization method.The numerical optimization result gave a low wave resistance ship hull at the design speed.which indicated that the method is effective.The result of total resistance shows that the new type of Wigley hull added a bulb has lower result than the original one，and the optimized type of Wigley hul1 gets the total resistance reduced further due to the reduction of the wave resistance. 3 100TEU was optimized by the same method at its design speed while Delta Shift method was applied to get the transformation.The results show that with the limitation of ship S displacement，the bulbous bow with a forward and upward extending would reduce the wave resistance.Meanwhile，the wetted surface which makes a great deal in the viscous resistance changes little.which means that the viscous resistance does not change significantly，thus the reduction of the wave resistance basically get the total resistance reduced.