SMS:Renumbering Nodes and Elements
From XMS Wiki - http://wikis.aquaveo.com/xms/
Meshes with gaps in numbering or with random numbering can lead to errors or inefficient solutions with many finite element solvers. The nodes and the elements can be renumbered simultaneously in an efficient manner by selecting the Renumber item from the Nodestrings menu. A node string must be selected before renumbering the mesh.
The selected node string is used to specify where the renumbering process begins. The "row" of elements and nodes adjacent to the string is numbered first. The elements and nodes adjacent to the first set of nodes and elements are numbered next, and so on until all of the nodes and elements have been renumbered.
The nodes and elements are renumbered in a sequence that can be envisioned as a "moving front" that passes through the mesh. Since the front proceeds from one set of elements to an adjacent set of elements, disjoint portions of the mesh will not be visited in the renumbering process. Unvisited nodes and elements are numbered arbitrarily.
