Resistance Performance Study of Catamaran Stern Flap Based on STAR-CCM+
The resistance of a ship is one of the important factors affecting the speed of a ship,in order to reduce the effect of resistance on the ship's sailing,NPL4a catamaran is taken as the research object,a stern flap is designed,and an overlapping mesh scheme based on the computational fluid dynamics(CFD)method is implemented to simulate the ship's motion in still water,so as to compare and verify the results with the model test.A study is conducted to evaluate the drag reduction performance of the catamaran with stern flaps of varying lengths.A numerical wave tank is also constructed to simulate the straight-ahead motion of the catamaran with and without stem flaps in regular head waves.The results revealed that in still water,the installation of a 1 mm stem flap reduced the average drag by 4.42％,while a 3 mm flap reduced it by 5.3％on average,achieving a maximum drag reduction rate of 10.35％at Fn=0.5.In contrast,the 5 mm flap achieved an average drag reduction of 3.42％.During high-speed navigation in waves,the hull resistance of the catamaran with stem flaps was lower than that of the bare hull.The designed stem flaps successfully achieved their drag reduction objective,and the research findings can serve as a valuable reference for future stern flap designs.
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