Automatic
Automatic gradation relieves the user from having to specify numerous mesh densities in order to obtain a smoothly graded mesh. Typically, given a body to mesh, the user only needs to assign mesh densities to the model entities that are of interest to him, letting the program figure out what the mesh densities should be anywhere else. This feature is particularly attractive when small mesh densities have been assigned to entities that are close to the interior of a model face, where mesh densities are difficult to set manually. As for curvature-based meshing, an octree is used to control the mesh densities.
- The methodology to control gradation comes from curvature-based meshing.
- An octree is used to smoothly grade the mesh sizes.
- The Delaunay mesher is used for surface meshing considering the tree for any size query.
Image Gallery
In this example, only the "legs" of the cell have been assigned mesh densities. Any other seen mesh density comes from the automatic gradation feature.
Figure 1 Quad cell detector
See also the following meshing methods in ADINA: