Algorithmic aspects and computational e$ciency of the global-basis two-level method are investigated in the context of symmetric inde"nite system of equations. The algorithm includes e$cient construction of the global-basis prolongator using Lanczos vectors, predictor}corrector smoothing procedures,
The generalized global basis (GGB) method
β Scribed by H. Waisman; J. Fish; R. S. Tuminaro; J. Shadid
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 564 KB
- Volume
- 61
- Category
- Article
- ISSN
- 0029-5981
- DOI
- 10.1002/nme.1107
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A robust two-level solver for high inde"nite system of equations arising from the "nite element discretization is developed. It is shown that the optimal coarse model is spanned by the spectrum of the highest eigenmodes of the smoothing iteration matrix. Convergence studies conducted on a model prol
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