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Combining Quadrilateral and Triangular Meshing Using the Advancing Front Approach

Rees, Matthew

Proceedings, 6th International Meshing Roundtable, Sandia National Laboratories, pp.337-348, October 1997

INTERNATIONAL
MESHING
ROUNTABLE

Matthew Rees
MARC Analysis Research Corporation
Palo Alto, California, USA
Email: matthew@marc.com

Abstract
A fully automatic mesher, has been developed which is capable of generating both quadrilateral and triangular elements in 2-D and on surfaces using the advancing front algorithm. This allows the formation of meshes which range from being all-quad or nearly all-quad down to all-triangular. In mixed-element meshes, the number of tri elements present. is dictated by the maximum allowable level of quad distortion specified by the user. Triangular elements are added during localized remeshing and only after attempts to add acceptable quadrilateral elements at every segment of the remaining mesh area have failed. In this way, the user is assured that unacceptably distorted quadrilaterals are avoided and the number of triangular elements is kept to a minimum. Mesh enhancement techniques further eliminate triangular elements and improve element quality.

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