Unstructured Methods

Abstract

Unstructured mesh techniques occupy an important niche in grid generation. The major feature of unstructured grids consists, in contrast to structured grids, in a nearly absolute absence of any restrictions on grid cells, grid organization, or grid structure. Figuratively speaking, unstructured grids manifest the domination of anarchy while structured grids demonstrate adherence to order. The concept of unstructured grids allows one to place the grid nodes locally irrespective of any coordinate directions, so that curved boundaries can be handled with ease and local regions in which the solution variations are large can be resolved with a selective insertion of new points without unduly affecting the resolution in other parts of the physical domain.