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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/88071

    Title: 圓柱後方渦旋與魚擺動之相位對耗能之影響
    Other Titles: The effect of phase on energy consumption reduction of swimming fish near shedding vortices behind cylinders
    Authors: 王懿友;Wang, Yi-You
    Contributors: 淡江大學航空太空工程學系碩士班
    湯敬民;Tang, Jing-Min
    Keywords: 擺動相位;同步化;節能;CFD-RC;Karman gait;Phase;synchronization;Energy-saving
    Date: 2013
    Issue Date: 2013-04-13 11:59:25 (UTC+8)
    Abstract: 本文透過計算流體力學軟體(CFD-RC)模擬阻礙物後方的魚隻擺動,分析阻礙物所產生的渦旋與魚身擺動相位的關係。本文於不同距離下(d=0.25L,0.5L,1L,3L,d:圓柱與魚身前緣的距離;L:魚身長度)讓魚在一流速0.45 m/s之自由流中游動,並使圓柱渦旋流逸的頻率和魚擺動頻率同步,再改變魚身擺動的相位,探討阻力功率和游動功率的變化。
    This research was to study the characteristics of the flow field with an undulating fish behind a circular cylinder. The effect of the phase of undulating fish and the shedding vortices from the cylinder upon the swimming power required was computed through CFD software (CFD-RC).
    Under different distances (d=0.25L, 0.5L, 1L, 3L, where d is the distance between cylinder and the leading edge of fish, L is the body length), a free stream with flow speed of 0.45 m/s passed through the fish body, after synchronized the shedding frequency of cylinder and the undulating frequency of fish, effects of the phase angle upon the drag power and swimming power were studied.
    Results demonstrated that the required drag power was higher than the swimming power when the distance was shorter than 1L. The smallest drag power consumed was observed when the vortices induced by the cylinder matched the phase of undulating fish.
    To conclude, for a fish to swim in a high speed flow behind an obstacle, it must adjust the phase according to the upstream shedding vortices to save the swimming energy.
    Appears in Collections:[航空太空工程學系暨研究所] 學位論文

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