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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/102646

    Title: Numerical simulation of 3-D flapping-wing insect's hovering flight under gust wind situations
    Other Titles: 三維拍翼昆蟲在陣風條件下滯空飛行之數值模擬
    Authors: 杭亮同;Hang, Liang-Tong
    Contributors: 淡江大學航空太空工程學系碩士班
    Keywords: 三維拍撲翼;動態網格;風場;3-D flapping wing;dynamic grids;gust effect;UDF
    Date: 2014
    Issue Date: 2015-05-04 10:00:57 (UTC+8)
    Abstract: 論文名稱:三維拍翼昆蟲在陣風條件下滯空飛行之數值模擬
    研究生:杭亮同 指導教授:宛 同
    本研究首先是先與學長及Wang, J.的研究論文所提到的二維板片八字形運動做比對驗證的工作。完成二維的驗證後再根據Dudley Robert的生物實驗研究資料選用Morpho peleides 此種蝴蝶,利用繪圖軟體PRO-E 繪製擬真三維蝴蝶外形並且利用商用軟體Gambit及ANSYS產生動態網格再結合UDF模擬出蝴蝶拍動飛行。之後參考Lian, Y.及Yang, G.等人之研究分別建立單頻率其多頻率之模擬風場進而分析三維蝴蝶在不同風場之下的空氣動力性能。根據吾人可知: 蝴蝶飛行受上下方向風場作用的影響極為劇烈,其升力係數差距可達十倍以上;由於吾人固定蝴蝶身體的俯仰角,故在定量分析上會存在誤差,吾人認為這來自於模擬前不自然的假設,但在定性的物理分析上,不論是壓力及渦度上的結果皆可充分詮釋蝴蝶的空氣動力性能。若是未來加上蝴蝶飛行時身體俯仰角的改變以及柔性結構的考量,將會增加計算結果的精準度。
    關鍵詞: 三維拍撲翼,動態網格,風場,UDF
    Title of Thesis: Total pages: 76
    Numerical simulation of 3-D flapping-wing insect''s hovering flight under gust wind situations
    Keywords: 3-D Flapping Wing, Dynamic Mesh, Gust, UDF
    Name of Institute: Graduate Institute of Aerospace Engineering, Tamkang University
    Graduate Date: June 2014 Degree Conferred: Master
    Name of Student: Liang-Tong Hang Advisor: Dr. Tung Wan
    杭亮同 宛 同 博士

    With advance of science and technology, the development of aerospace technology progress fast. Flapping-wing is a popular and innovative topic. Based on Darwin''s theory of evolution; we can have a general interpretation of each biological behavior patterns are the results of optimization. So it is important to combines aerodynamics and Bionics. Many researchers put effort into study the unsteady aerodynamics and flapping flight but study in flapping-wing Affected by atmospheric environment is much less. Our research team has studied the impact of weather factors for a long time and extensive lots experience in the analysis of different climatic conditions. In this thesis, we will discuss effect of flapping wings for aerodynamics in different gust. Here we use the dynamic grid mechanism of commercial software ANSYS / FLUNET to simulate flapping-wings, edit UDF in C++ and combine Solver to analysis aerodynamic performance under gust. First, we finish the validation of 2-D elliptic flapping wing section with Wang, J. We build 3D model butterfly which species is Morpho peleides Butler by PRO-E. From the morphological data of Morpho peleides is measured by Dudley. We generate mesh by Gambit and ANSYS and use dynamic mesh mechanism of ANSYS / FLUNET to simulate the butterfly forward flight. According to Liang and Yang, we create two type of the gust function with single and multiple frequencies. We analysis the butterfly under different gust and different directions and find lift coefficient is sensitive for the gust from top and bottom. The mean value of lift coefficient can be increased more than tenfold compared with the case without wind effects. And since the assumptions we make, our results may occur tolerance in quantitative values but it is worth referencing in Qualitative physical interpretation. If possible, consider the pitching oscillation of body and the flapping-wing with flexible in the future will improve accuracy of the results.
    Appears in Collections:[航空太空工程學系暨研究所] 學位論文

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