Influence on the Ship Resistance Performance of the Lines Optimization of the Bow and Stern

In order to improve the performance of the original hull resistance,with the hull resistance as optimal object,the effect of varying bulbous stem and mold lines of stern to hull resistance was studied based on the modifying parent ship method.The highly integrated Tribon system,the visual mapping software Auto CAD and the current CFD pre-treatment software ICEM were used in the establishment of the hull model.The rationality and validity of the CFD technology used in the research of resistance performance was validated through the comparison of the results of simulation and experiment.Considered from the resistance performance aspect,the low speed plentiful ships selecting the popular type bulbous bow and the medium and high speed ships selecting the goes up bulbous bow may obtain the good effect of drag reduction through the comparison of the resistance of the ships with different kind of bulbous bow.Meanwhile,by comparing hull resistance of various mold lines stern under different speed show that the optimal ship hull featuring lower resistance and the minimum power consumption at the same speed,whose shape effect is smaller,the pressure resistance and friction resistance are relatively smaller than others through the effect of stern line on the hull resistance under different velocities.