Author(s): LIU Jia-huan, WANG Zhi-dong, CHEN Jian-wen, DOU Jing, LV Hong-ling
Pages: 18-22,31
Year: 2014 Issue:  10
Journal: Ship Science and Technology
Keyword:  wavy wall cylinder; karman vortex; wave drag reduction;
Abstract: This article based on CFD software Fluent, developed the numerical calculation of wavy wall circular cylinder and established the model of the two DOF wavy wall circular cylinder. Under the of same inflow velocity u, Reynolds number Re and different fluctuation velocities where u=0. 005 m/s, Re=500 and c =0, 0. 005, 0. 01, 0. 015, 0. 02, 0. 025, 0. 03, 0. 04 m/s, the paper developed the computational analysis of wavy wall circular cylinder. Furthermore, the paper compared the influence of flow field structure, the lift and drag characteristics under different fluctuation velocities. The results show that wavy wall cylinder can suppress flow separation effectively and eliminate the alternate shedding trailing vortex. The drag reduction effect is remarkable. The average drag coefficient is decreased obviously with the increased fluctuation velocity. When the wave velocity exceed 0. 025 m/s,resistance turn to negative. Then the wavy wall circular cylinder generate thrust.