William M. Lira,  Paulo Roma Cavalcanti,  Luiz C. G. Coelho,  Luiz F. Martha. 

This paper presents an object-oriented approach for creating multi-region non-manifold models with NURBS. The main motivation is that geometry and shape of realistic engineering objects are intrinsically complex, usually composed by several materials and regions. Therefore, automatic and/or adaptive meshing algorithms have been turned quite useful to increase the reliability of the procedures of a FEM numerical analysis. The present approach is then concerned with two aspects of 3D FEM simulation: geometric modeling, with automatic multi-region detection, and support to automatic finite element mesh generation. The final objective is to use geometric models directly in numerical applications

http://sibgrapi.sid.inpe.br/rep-/sid.inpe.br/banon/2002/11.28.11.13

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