| Summary: | 碩士 === 國立成功大學 === 航空太空工程學系碩博士班 === 93 === In the recent time, the application of unstructured mesh in Computational Fluid Dynamic becomes very important because of its availability of triangulating complicated geometry and its simplicity for use of adaptive mesh technique. When viscous flow fields through around the surfaces of geometry, unstructured tetrahedral meshes are difficult to efficiently treat boundary layer problems. In this paper, we combined the method of Liu and Hwangand Chien-Wen Lai to create the prismatic meshes around the surface of geometry, and the other regions are divided into tetrahedrons. It will be spend more time to create the unstructured triangular meshes on surfaces of geometry. The CAD software of CATIA is adopted in this paper to provide geometry which we need. And then using it to create the unstructured triangular meshes on surfaces of geometry , then combine together the unstructured tetrahedral developed by Liu and Hwang. With the tetrahedral/ prismatic mesh system, the prismatic meshes are simply to efficiently treat boundary layer problem. And the other way , CATIA can form the boundary meshes more faster.
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