GENERATION OF QUADRILATERAL MESH OVER ANALYTICAL CURVED SURFACES

An automatic adaptive quadrilateral mesh conversion scheme for the gen eration of adaptive refinement meshes over analytical curved surfaces is proposed. The starting point of the quadrilateral mesh generator is a background triangular mesh of the curved surface. By a carefully co ntrolled process to merge two triangles at a time the triangular mesh can be completely converted to quadrilaterals. A rapidly graded quadri lateral mesh with node spacing compatible with the desired element siz e distribution can be obtained from a well-graded triangular mesh. The quality of the quadrilateral mesh can be subsequently enhanced by a s eries of mesh modifications and element shape improvement procedures. The present scheme can be used in conjunction with an adaptive surface triangular mesh generator to generate quadrilateral meshes suitable f or adaptive shell refinement analysis. (C) 1997 Elsevier Science B.V.