Large-eddy simulation of the compressible flow past a tabbed cylinder

查看全文 作　　者：XU [1]ChangYue;ZHAO [1]LiQing;SUN [1]JianHong

机构地区：[1]College of Aerospace Engineering Nanjing University of Aeronautics&Astronautics,Nanjing 210016,China

出　　处：《Chinese Science Bulletin》索引2012年第57卷第24期,共8页

基　　金：supported by China Postdoctoral Science Foundation(20100481141 and 201104567);the Fundamental Research Funds for the Central Universities (NS2012032);Natural Science Foundation of Jiangsu Province (BK2011723);Jiangsu Planned Projects for Postdoctoral Research Funds (0902001C);Scientific Innovation Research of College Graduate in Jangsu Province (CX08B_035Z);Innovation and Excellence Foundation of Doctoral Dissertation of NUAA (BCXJ08-01) 摘　　要：The compressible flow past a tabbed cylinder has been studied numerically using large-eddy simulation for a free-stream Mach number M∞=0.75 and a Reynolds number based on the diameter Re=2×105. Because of the passive control of the flow past a tabbed cylinder, the mean drag coefficient of tabbed cylinder is less than that of a corresponding circular cylinder with a drag reduction up to 33%. The fluctuating lift coefficient is greatly suppressed to be nearly zero. Drag reduction due to the shearing process prevails over that due to the compressing process in this flow. Through investigating the mechanisms relevant to passive control of the tab, it is found that suppression of the shear layer instability can lead to a higher-base-pressure distribution, which can reasonably be associated with drag reduction and suppression of the lift fluctuations. The analysis of convective Mach number and self-sustained oscillations phenomenon inside the shear layers indicates that both the compressible effect and high-frequency forcing result in suppression of the shear layer instability of tabbed cylinder. 关键词：可压缩流动大涡模拟标签气缸被动控制剪切层数值研究阻力系数

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Large-eddy simulation of the compressible flow past a tabbed cylinder

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