Page "Delaunay triangulation" Paragraph 3

With FEM / BEM increasing popularity comes the incentive to improve automatic meshing algorithms.

However, all of these algorithms can create distorted and even unusable grid elements.

Fortunately, several techniques exist which can take an existing mesh and improve its quality.

For instance smoothing ( also referred to as mesh refinement ) is one of such methods, which repositions nodal locations, so as to minimize element distortion.

The stretched grid method allows the obtaining of pseudo-regular meshes that meet the Delaunay criteria very easily and quickly in a one-step solution.