2011 | OriginalPaper | Buchkapitel
Analysis of the CBS Constant for Quadratic Finite Elements
verfasst von : Ivan Georgiev, Maria Lymbery, Svetozar Margenov
Erschienen in: Numerical Methods and Applications
Verlag: Springer Berlin Heidelberg
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We study the behavior of the CBS constant as a quality measure for hierarchical two-level splittings of quadratic FEM stiffness matrices. The article is written in the spirit of [3] where the focus is on the robustness with respect to mesh and coefficient anisotropy. The considered splittings are: Differences and Aggregates (DA); First Reduce (FR); and hierarchical P-decomposition (P). The presented results show sufficient conditions for the existence of optimal order Algebraic MultiLevel Iteration (AMLI) preconditioners.