Hexahedral mesh generation for composite domain is necessary for many engineering fields, and this paper includes three methods to generate hexahedral finite elements from the result of the 3D Delaunay triangulation. One of the difficulties of mesh generation of composite domain is how to adjust the meshing on common surfaces between adjacent subdomains, and very simple method is proposed in this paper. Proposed methods are directly applied for any composite domain as a fractured rock which consists of many convex subdomains.
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