Abstract
Algorithmic aspects and computational efficiency of the global-basis two-level method are investigated in the context of symmetric indefinite system of equations. The algorithm includes efficient construction of the global-basis prolongator using Lanczos vectors, predictor–corrector smoothing procedures, and a heuristic two-level feedback loop aimed at ensuring convergence. Numerical experiments consisting of 3D Helmholtz equations and shear banding problems with strain softening demonstrate the excellent performance of the method. Copyright © 2000 John Wiley & Sons, Ltd.
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