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Simulation on Flow Control for Drag Reduction of Revolution Body Using Bionic Dimpled Surface

ZHANG Cheng-chun1,2,REN Lu-quan3,WANG Jing4,ZHANG Yongzhi5 (1.State Key Laboratory of Automotive Safety and Energy,Tsinghua University,Beijing 100084,China;2.Zhengzhou Yutong Bus Co.,Ltd,Zhengzhou 450016,Henan,China;3.Key Laboratory for Terrain-Machine Bionics Engineering,Ministry of Education,Jilin University,Changchun 130022,Jilin,China;4.College of Agriculture,Jilin University,Changchun 130062,Jilin,China;5.College of Mechanical Science and Engineering,Jilin University,Changchun 130022,Jilin,China)  
Numerical simulations on drag reductions for the dimpled and the smooth revolution bodies were performed and compared with SST k-ω turbulence model,to explain the reasons of friction and base drag reductions on the bionic dimpled surface and the control behaviors to boundary layer near wall of the revolution body.The simulated results show that the dimpled surface arranged on the rearward of the revolution body reduces the skin friction drag by 8.05%,the base drag by 1.9% and the total drag by 6.24% at Mach number 0.4;the dimpled surface reduces the skin friction drag through reducing the velocity gradient and turbulent intensity,and reduces the base drag through weakening the pumping action on the flow behind the revolution body caused by the external flow;the flow control behavior on boundary layer produced by dimpled surface displays that the low speed rotating vortexes in the dimples like vortex cushions,which segregate the external flow and the revolution body;and the low speed rotating vortexes forming in the bottom of dimples can produce negative skin friction against to the other area,which can be considered a accessional impetus.
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