淡江大學機構典藏:Item 987654321/111415
English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 64198/96992 (66%)
造訪人次 : 7966296      線上人數 : 9203
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜尋範圍 查詢小技巧：
  • 您可在西文檢索詞彙前後加上"雙引號"，以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋，建議至進階搜尋限定作者欄位，可獲得較完整資料
    •  進階搜尋


    請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/111415


    題名: 鈍體後方渦旋與魚身擺動間相位對流場之影響
    其他題名: Effect of phase between the vortex shedding and the field swimming upon the flow field
    作者: 余恬欣;Yu, Tien-Hsin
    貢獻者: 淡江大學航空太空工程學系碩士班
    湯敬民;Tang, Jing-Min
    關鍵詞: 數值模擬;圓柱;擺動魚隻;擺動相位;Numerical Simulation;cylinder;undulating fish;Phase
    日期: 2016
    上傳時間: 2017-08-24 23:52:13 (UTC+8)
    摘要: 本研究主要透過計算流體力學軟體(ANSYS-FLUENT)模擬三維流場中阻礙物後方的魚隻擺動，探討魚在圓柱後方尾流區游動時與逸散渦流間之互動關係。文章中，固定圓柱與魚隻之間距(0.2m)，讓魚隻在流場速度0.9m/s之自由流中游動，魚隻擺動周期為0.45秒，以1/6週期(0.075秒)為一個單位，並施以六種延遲，觀察其流場特性及觀察游動功率變化。

    研究結果顯示，在 (0.000秒、0.075秒、0.150秒、0.225秒、0.300秒、0.375秒) 等六個不同之起始擺動時間點下， (0.075秒、0.225秒、0.300秒、0.375秒)等起始擺動時間點有較小之游動功率，而0.000秒及0.150秒等之起始擺動時間點有較大之游動功率。由壓力圖得知，前三個時間點(0.000s, 0.075s, 0.150s)之壓力分佈圖趨勢較為類似，但0.075秒之壓力數值較另外兩個時間點小了許多，反而與0.225秒、0.300秒、0.375秒之壓力數據較接近。其原因推測為魚隻前方渦漩與魚尾渦漩相互抵消，且魚隻擺動時高壓區位於擺動方向另一側。
    This research simulated the characteristics of the flow field with an undulating fish behind a blunt body in three-dimension. A CFD software (ANSYS-FLUENT) was used to analyze the interaction of flow field induced by the vortex behind a blunt body and the vertical flow initiated by an undulating fish. Parameters included in this study were, the velocity of the fish swimming (0.4m / s), the distance between the blunt body and the fish (0.2m), the undulating period of swimming (0.45s). One sixth period of increment was used in analyzing the effect of various delay offset on the characteristics of the flow field and the variation of power required for swimming.
    The results show that in six different starting undulating delays (0.000s, 0.075s, 0.150s, 0.225s, 0.300s, 0.375s) , the following four cases (0.075s, 0.225s, 0.300s, 0.375s) showed smaller swimming power required, while the other two (0.000s, 0.150s) needed higher swimming power. Results indicated that the first three cases exhibiting similar trend in pressure variations. However, the pressure variation of the case with delay of 0.075 was milder than the other two. Similar results were also observed in second group. It could be caused by the cancelling of vortex on one side of fish and the high pressure on the other side.
    顯示於類別:[航空太空工程學系暨研究所] 學位論文

    文件中的檔案:

    檔案 描述 大小格式瀏覽次數
    index.html0KbHTML229檢視/開啟

    在機構典藏中所有的資料項目都受到原著作權保護.

    TAIR相關文章

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回饋