GGU-ELASTIC: "Round off" menu item

During Delauney triangulation a triangular mesh is generated that envelops all nodes. This can lead to acute-angled triangle elements in the boundary regions. These triangles can be removed from the FEM mesh using this menu item.

The program first draws the maximum radius ratio of the most unfavourable triangle and displays the data in a message box. You then see a dialog box, allowing you to define a maximum radius ratio above which all triangles with greater values are deleted.

The radius ratio describes the relationship between external radius and internal radius of a triangle. For an equilateral triangle, this ratio equals 2.0 (optimum). In the example above, all external triangles with a radius ratio greater than 3.14 will be removed.

In order to avoid interpolation holes in the triangle system only triangles at the boundaries are deleted.