BLCKHOLE is an artificial finite-element model consisting of a finely gridded geodesic dome clamped to a coarsely gridded rectangular base. Because of the difference in gridding factors, the interface nodes on the base have a very high order. SSTMODEL is the elemental connectivity for the stiffness matrix of a 1960's design for a supersonic transport (the Boeing 2707).

For the BLCKHOLE example, the strange gridding plays havoc with orderings based on level structures, and is nearly a worst case for the Gibbs-Poole-Stockmeyer heuristic. Reverse Cuthill-McKee and Gibbs-Poole- Stockmeyer are nearly a factor of two away from obtaining the minimum bandwidth of this problem. General sparse methods fair well despite the strange gridding.

Matrices in this set:

• BLCKHOLE (pattern symmetric indefinite, 2132 by 2132, 8502 entries), Geodesic dome clamped to rectangular base
• SSTMODEL (pattern symmetric indefinite, 3345 by 3345, 13047 entries), Elemental connectivity for the stiffness matrix of a 1960's design for a supersonic transport (Boeing 2707)
  
  
• Download the entire set BCSSTRUC6 (single compressed file, 41726 bytes).
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Last change in this page: Wed Sep 22 13:33:28 US/Eastern 2004 [Comments: ]