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1.1 Introduction

The MODULEF library proposes the following algorithms for two-dimensional meshes:

• methods corresponding to a manual approach,
• a transport-projection function (or algebraic method),
• a advancing-front mesh generator,
• a Voronoi technique, and
• a block method.

Module APNOPO, called directly, or via the preprocessor APNOXX, performs the following functions:

1. generates two-dimensional meshes from the point, line, contour, etc., data, using the mesh algorithms;
2. stores the NOPO data structures (or D.S.), containing the meshes created, in main memory;
3. modifies and combines these meshes to form new meshes, along with their corresponding D.S. NOPO, which can be saved on sequential file.

EMC˛ allows:

• to create two dimensional meshes interactively from the geometry (CAD); the definition of the discretization on the contours; the definition of the sub-domains, and the definition of reference numbers to take into account the boundary conditions and the sub-domains' properties,
• to create data for APNOXX,
• to create two kinds of meshes: structured meshes and Delaunay Voronoi (automatic mesh),
• to edit meshes: remove or add vertices, and perform regularization or geometric transformations (symmetry, rotation, ...), etc