Meshing of volumes algorithms
Introduction
Flux provides three generators for automatic meshing of volumes: the ASML mesher, the Delaunay mesher, and the MeshGems mesher.
The three meshers are presented in the blocks below.
MeshGems mesher
MeshGems, by its module MGTetra it is a generator of tetrahedral mesh of volume from a mesh of surface triangular. It is marketed by Distene http://www.distene.fr/
ASML mesher
The ASML Mesher (Altair Solid Meshing Library) is a volume mesher which is the proprietary of Altair. This is a mesher of volume mesh starting from a surface mesh. Including ASML allows to generate tetrahedral mesh of volume from a mesh of surface triangular like the module MeshGemsTetra (which is not the proprietary of Altair).
Delaunay mesher
The mesh generation by the Delaunay mesher is carried out in two phases, as presented in the table and figure below.
Stage  Description 

1  Generation of boundary mesh 
2  Insertion of internal nodes into border mesh elements 
Comparison
Comparison of Volume mesh generators is presented in the table belowDelaunay  MeshGems / ASML (Altair Solid Mesher Library)  

Characteristics 


Advantages / disadvantages 


Configure the mesher
To configure the volume mesher:
 clic on:
 clic on tab Mesh
 choose the mesher
Mesh optimization
Flux equally provides an algorithm for the optimization of the automatic volume meshing with Delaunay or MesGems meshers (The mesh optimisation is not available with ASML for this first version).
The optimization enables:
 to improve the mesh quality
 to reduce the number of elements
Optimization of the process
The mesh optimization is an iterative process of partition and/or fusion of the volume elements in function by certain predefined criteria. The global goal is the improvement of the mesh quality and the reduction of the number of elements.
The number of iterations influences over the quality of the result and the process time:
 Optimization of average quality and rapid: one iteration
 Optimization of good quality and slow: five iterations
The default number of iterations is set to 3, a value permitting to obtain a good quality/time ratio.