Técnicas para geração de malhas de quadriláteros convexos e sua aplicação em reservatórios naturais

Abstract

This work describes four methods implemented to achieve a convex quadrilaterization of the two- -dimensional space that may have polygonal lines or holes. Two of these methods, midpoint and ortoquad make use of guide elements, the centroid of a region or the locus of maximum tangent circles inside a geometry, to produce a mesh for the domain. The other two methods, triquad and incremental quadrilatezation use a implicit and explicit triangulation while combining elements in pairs to generate a mesh. All these methods are made through domain decomposition which assure quadrilaterization at the end, since the domain is always partitioned at each iteration. These techniques are compared by a criterion of geometry and topology in order to make clear its advantages and disadvantages and as means of promoting future improvements. The techniques are applied to some samples, including a natural reservoir, in order to view its operation in a real environment or near reality according to the sample used. Also it intends to present throughout this work the requirements, according to the experience with the theme of this author, to develop a technique for quadrilateral mesh generation.