Resequence Command

The Resequence command is used to renumber the numbers in an attempt to minimize the bandwidth of the problem. The smaller the bandwidth, the faster will be the FEA calculations. The two options are:

Resequence #1,#2

or

Resequence #3

where

• (#1, #2) define (x, y) coordinates (in mm) for a point (or (R, Z) if axisymmetric). The resequencing will start at the one node nearest to that point.
• #3 is a previously defined <a href="keypoint.html">key point</a>. The resequencing will start at the node at that key point.

Notes

1. It is best to start the resequencing at a node on the boundary of the object and probably on a corner. The final bandwidth may depend on the node selected for resequencing. The bandwidth is report in FEA output results. You can vary the resequencing node to find the minimum value.
2. Another use of this command is to verify mesh connectivity. Since disconnected sections of a static FEA mesh will cause a singular stiffness matrix, the calculations will fail. This command will find such connectivity problems before the calculations start.
3. The algorithm used to resequence the nodes in described in a paper by <a href="../references.html#Gibbs1976">Gibbs, Poole, and Stockmeyer (1976)</a>.
4. The Resequencing command should come after the other <a href="definemesh.html">meshing commands</a> are done
5. The Resequence command is only allowed for <a href="analysis.html">FEA analyses</a>.