串列雙圓柱繞流問題數(shù)值模擬的多尺度分析
發(fā)布時間:2018-09-08 09:34
【摘要】:運用有限體積法,對串列放置的雙圓柱二維不可壓縮流動進行了直接數(shù)值計算.在分析Strouhal數(shù)及升阻力系數(shù)等積分量的基礎(chǔ)上,本文從流動多尺度層面研究了流場分布及渦結(jié)構(gòu).通過對速度場的流動顯示和頻譜分析,確定了渦脫落的多個頻率,以及分別受上游圓柱和下游圓柱邊界層擾動形成的多尺度渦的相互作用,并且發(fā)現(xiàn)由于多尺度渦的相互作用形成了更小尺度渦的過程及機理.最后,進一步將這些渦結(jié)構(gòu)與流場模態(tài)對應(yīng)起來,使得流場結(jié)構(gòu)更加清晰地展現(xiàn)出來.
[Abstract]:By using the finite volume method, the two-dimensional incompressible flow of two cylinders placed in series is directly numerically calculated. Based on the analysis of Strouhal number and drag coefficient, the flow field distribution and vortex structure are studied in this paper. Through the flow display and spectrum analysis of the velocity field, the frequency of vortex shedding and the interaction of multi-scale vortices formed by the upstream cylinder and downstream cylindrical boundary layer disturbance are determined. It is also found that the process and mechanism of smaller scale vortices are formed by the interaction of multi-scale vortices. Finally, these vortex structures are further corresponding to the flow field modes, so that the flow field structure can be displayed more clearly.
【作者單位】: 復(fù)旦大學(xué)航空航天系;
【基金】:國家自然科學(xué)基金重大研究計劃培育項目(91434112) 上海千人計劃啟動項目(EZH2126503) 上海教育委員會、中航商業(yè)發(fā)動機、復(fù)旦大學(xué)數(shù)值仿真聯(lián)合創(chuàng)新中心項目(AR908.D1RW.002)
【分類號】:O357.5
[Abstract]:By using the finite volume method, the two-dimensional incompressible flow of two cylinders placed in series is directly numerically calculated. Based on the analysis of Strouhal number and drag coefficient, the flow field distribution and vortex structure are studied in this paper. Through the flow display and spectrum analysis of the velocity field, the frequency of vortex shedding and the interaction of multi-scale vortices formed by the upstream cylinder and downstream cylindrical boundary layer disturbance are determined. It is also found that the process and mechanism of smaller scale vortices are formed by the interaction of multi-scale vortices. Finally, these vortex structures are further corresponding to the flow field modes, so that the flow field structure can be displayed more clearly.
【作者單位】: 復(fù)旦大學(xué)航空航天系;
【基金】:國家自然科學(xué)基金重大研究計劃培育項目(91434112) 上海千人計劃啟動項目(EZH2126503) 上海教育委員會、中航商業(yè)發(fā)動機、復(fù)旦大學(xué)數(shù)值仿真聯(lián)合創(chuàng)新中心項目(AR908.D1RW.002)
【分類號】:O357.5
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8 郭明e,
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