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Li G.,Zhejiang Ocean University | Zhao L.,Zhejiang Ocean University | Chen Q.,Wuhan Rule and Regulation Research Institute | Hu X.,China Warship Research and Design Center | Xie Y.,Zhejiang Ocean University
Ship Building of China

Wave-making resistance is a main component in total resistance of a high-speed ship. Based on linear wave-making resistance principle, calculation formulas of wave-making resistance and interfering factor for asymmetric catamaran are derived and characteristics of wave-making resistance are analyzed. The effect of piece hull's position on wave-making resistance is researched. A hybrid genetic algorithm based on the Isight optimization platform is applied to the optimization of the piece hull's position with minimum of wave-making resistance as the goal. The optimization scheme has smaller wave-making resistance than that of the initial one at given speed, which shows that this method can provide a reference for the design of piece hull's position for asymmetric catamaran. Source

Li G.,Wuhan University of Technology | Wu W.,China Ship Scientific Research Center | Zhang J.,China Ship Scientific Research Center | Xie Y.,Zhejiang Ocean University | And 2 more authors.
Kongqi Donglixue Xuebao/Acta Aerodynamica Sinica

Based on the characteristics of the propeller wake symmetry in circumferential direction, the circumferential velocity distribution of propeller wake in uniform flow is measured through 2D-LDV devices at two test points arranged on a cross-section behind the propeller at a circumferential interval of 90°. The shear effect of tail vortex flow, the flow around and the flow separation condition of the tip vortex are also obtained in order to show information of the dynamic macroscopic and microcosmic flow field. Finally, the hydrodynamic pitch angle and total attachment vortex circulation of the propeller are calculated and analyzed to get their space distribution. ©, 2014, The Editorial Board of Acta Aerodynamica Sinica. All right reserved. Source

Li G.-N.,Zhejiang Ocean University | Chen Q.-R.,Wuhan Rule and Regulation Research Institute | Xie Y.-H.,Zhejiang Ocean University | Hu X.-F.,China Warship Research and Design Center
Shuidonglixue Yanjiu yu Jinzhan/Chinese Journal of Hydrodynamics Ser. A

Based on Green's theorem, a panel method in time domain has been developed for the wave making analysis of a moving asymmetric catamaran. The Rankine sources and dipoles are distributed on the hull body surface and free surface, on which the nonlinear free surface condition is satisfied. A time-stepping method is employed to simulate the wave pattern. An analytical method is performed to calculate the influence coefficients for avoiding numerical diffusion. The numerical results of wave-making resistance and wave patterns are presented for the asymmetric catamaran, of which the main hull and out hull is arrange differently in longitudinal and horizontal direction. The influence between two hulls is analyzed at various speeds. Source

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