The mesh generation algorithms are divided into two types: those that require the presence of a surface to provide a context of operation, or those working entirely from node and/or line data.
The mesh generation algorithms include:
Autodecide |
If you are meshing a surface, the default mesh generation algorithm is Autodecide. In this case, the geometry of each face and the element densities specified for each edge is analyzed, and the algorithm that will give the best results is selected. For most configurations, the Free algorithm is chosen. |
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Free |
The Free meshing algorithm is a general-purpose formula that works for most meshing conditions. The surface can have interior holes or edges and any number of sides. If quads or trias is the selected element type, an advancing front algorithm is used. If mixed is the element type, a sub-mapping algorithm is used. The advancing front algorithm uses the following process:
If quads is the selected element type for the current face, HyperMesh attempts to produce an all-quads mesh, but there are some situations in which one or more trias are included:
If quads only is the selected element type, a mesh is created consisting entirely of quads; no trias will be used.
If trias is the selected element type, a streamlined version of this algorithm that is optimized for the different shape and connectivity requirements of tria elements is used. These two examples show the difference between conventional and right-trias. |
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Map as Triangle, Rectangle, Pentagon, or Circle |
If the region is free from internal holes and the boundary is clearly triangular, rectangular, or pentagonal in shape, the best choice of algorithm is usually to map a standard mesh onto the region using transfinite interpolation. Such an operation is exceedingly fast, and where applicable, gives quality results rapidly. A standard template based on the element densities around the perimeter of the region is chosen. Ignoring rotations, more than 18 different configurations requiring distinct templates are recognized. To make tria elements, first a quads mesh is created and then each element is divided along its shortest diagonal. In general this decision can be left to autodecide, but there may be some cases in which a manual decision is necessary to produce the best results.
On the Automesh secondary panel, a white icon denotes the mapping algorithm used for each meshed surface.
Map as Triangle Map as Rectangle Map as Pentagon Map as Circle |
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Map without Surface |
If you are creating a mesh entirely from line and/or node data, with no surface, the mesh generation algorithm is decided by the tool that was used to describe the desired operation. If you use the Drag panel, the algorithm is to drag. If you use the Spin panel, the algorithm is to spin, and if you use the Spheres panel, the algorithm is to map a sphere-covering mesh. You can still use the density and biasing manipulation tools but some edges will be linked together, so that the configuration always satisfies the balancing requirements of the intended mapping. |
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