對於複雜幾何外形，使用非結構性網格具有方便性。為有效建構網格，本文採用CATIA電腦輔助設計軟體來提供幾何外型及表面三角形網格。雖然賴與黃所發展之網格建立法可在流場中建立非結構性四面體網格，然而步驟繁雜且不方便。換言之當外形有所改變時，需重新撰寫資料處理之程式。且此程式分成許多小部分。此外，利用賴與黃之方法在內流場區域建立稜鏡型與四面體時，入/出口處之網格將產生扭曲之現象。本論文改良網格建立步驟及相關程式以解決問題，且將改進後之程式運用至球、圓管、噴嘴、微散熱器、微熱導管及分岐管等流場區域之網格建構。最後，利用尤拉解程式計算球表面及噴嘴軸中心處之壓力分布並與相關之解析解比較以確定網格法之可用性。

For the domain with complex geometry, it is convenient to use the unstructured meshes. To efficiently construct meshes, the CAD software of CATIA is adopted in this thesis to provide the geometric shape and surface triangular meshes. Although the mesh generation approach, which was developed by Lai and Hwang, can be used to construct the unstructured meshes in the flow field the procedures are tedious and inconvenient. In other words, when the geometry changes, the program for treating the data structure must be rewritten and this program contains several portions. Besides, the meshes near the inlet/outlet regions will be distorted when the approach proposed by Lai and Hwang is applied to the inner flow domains. On this thesis, the above-mentioned problems are solved by improving the mesh generation procedures and related programs. Also, the revised program is need to construct the Tetrahedral/prismatic meshes for the flow field around on inside the sphere , circular pipe, nozzle, micro heat spreader, micro heat pipe and bifurcating tube. Finally, a Euler flow solver is to compute the pressure distributions along the surface of sphere and center line of nozzle. Then, those computed result are compared with the related analytical solution to confirm the availability of present mesh approval.

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