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        The characteristics of flow around six in-line circular cylinders at low Reynolds numbers

        發布時間:2019-07-16 14:42:50 發布人:李驥奮  審核人:李天鎮

        報告題目:The characteristics of flow around six in-line circular cylinders at low Reynolds numbers

        主 講 人:Tongming Zhou教授



        主講人簡介:Tongming ZHOU (周同明),現任澳大利亞西澳大學土木、環境和采礦工程學院教師,博士生導師,工程和數學科學學院教學委員會委員。1987年在大連理工大學獲得水利水電工程建筑專業工學學士學位,1989年在清華大學獲得水力學及河流動力學工學碩士學位,1999年在澳洲Newcastle大學獲流體力學理學博士學位。2000年-2007年在新加坡南洋理工大學擔任助理教授、副教授。從事的主要研究領域包括實驗流體力學、流動控制、渦激振動、海洋能開發與利用等,負責多項政府和企業項目。發表學術論文近200篇,其中在流體力學和能領領域頂級期刊《Journal of Fluid Mechanics》、《Applied Energy》等發表SCI檢索論文95篇,引用2000余次(h-index為25)。

        報告摘要:Flow past a circular cylinder has attracted significant amount of attention in fluid mechanics community due to its interesting phenomena and close relationship with industrial applications. When the number of cylinder is increased, the flow becomes more complex. This work investigates the characteristics of the flow field around a group of circular cylinders arranged in in-line configuration. A series of two-dimensional numerical simulations are carried out to simulate the flow for Reynolds number in the range of 40 to 180 and gap to diameter ratio from 0.5 to 18. According to the vortex shedding characteristics around the six cylinders, a flow regime map is proposed where the flow is categorized into 4 different regimes, namely no-shedding regime, primary shedding regime, secondary shedding regime and tertiary shedding regime. Before the transitions between flow regimes happen, shear layer re-attachment or extended shear layers are formed. For large gap to diameter ratios, the three vortex shedding regimes can co-exist and each regime dominates a region around the group of cylinders. The effect of the flow regime transition on vortex shedding frequency and force coefficients of each cylinder are quantified and explained. When the number of cylinders is increased further, the vortex shedding processes of the downstream cylinders become chaotic after transition to tertiary wake.