在航空發展史上，建立多功能之多元化飛行器一直是人類之目標。除了現有固定翼飛行器外，振翅機與旋翼機一直吸引人們的注意力。為完成振翅機與旋翼機之研究，利用計算流體力學方法探討流場與空氣動力行為是目前重要之工作。為達到上述目的，網格之建立是必需的。本文採用CATIA電腦輔助設計軟體提供所需的幾何外型，並在表面建立非結構性三角形網格以形成邊界網格，最後結合劉和黃所發展之網格建立法，在整個流場區域中建立非結構性四面體網格，由於非結構四面體網格較難有效處理邊界層與紊流問題，因此在翼表面附近建立稜鏡型網格而其他區域以四面體分割。至於動態四面體/稜鏡型網格系統，採用剛體-可變形動態格點演算法處理格點位移。對於振翅翼拍撲/扭轉運動，已能利用本文所提出的方法成功地模擬出其運動行為。

　During the history of aeronautic development, creating the versatile flight vehicle with multifunctional capabilities is always the goal of mankind. Besides the existing fixed-wing aircraft, the ornithopter and helicopter are always attracting the people’s interest. To accomplish the study of ornithopter and helicopter, the main work is to apply CFD to investigate the flow-field phenomena and aerodynamics. To achieve the foregoing goal, it is necessary to generate the mesh. The CAD software of CATIA is adopted in this thesis to provide geometry which we need. We use it to create the unstructured triangular meshes on surfaces of geometry to form the boundary meshes. Finally, we combine together the unstructured tetrahedral meshes which are created by adopting a strategy for unstructured mesh generation developed by Liu and Hwang in the whole flow domain. Because the unstructured tetrahedral meshes are difficult to efficiently treat the boundary-layer and turbulent flow problems, the prismatic meshes are created around the wing surface, and the other regions are divided into tetrahedrons. On the tetrahedral/prismatic mesh system, the rigid-deformable dynamic mesh algorithm is adopted to handle the grid displacement. The flapping/twisting motion has been simulated successfully by the presented method in this thesis.

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