next up previous
Next: About this document ...

David Moulton
Robust and Adaptive Multigrid Methods: comparing structured and algebraic approaches

Applied Mathematics and Plasma Physics
MS B284
Los Alamos National Laboratory
Los Alamos
NM 87545
moulton@lanl.gov
Scott MacLachlan
Tim Chartier

Although there have been significant advances in robust algebraic multigrid methods in recent years, numerical studies and emerging hardware architectures continue to favor structured-grid approaches. Specifically, implementations of logically structured robust variatoinal multigrid algorithms, such as the Black Box Multigrid (BoxMG) solver, have been shown to be 10 times faster than AMG for three-dimensional heterogeneous diffusion problems on structured grids. BoxMG offers important features such as operator-induced interpolation for robustness, while taking advantage of direct data access and bounded complexity in the Galerkin coarse-grid operator. Moreover, since BoxMG uses a variational framework, it can be used to explore advances of modern adaptive AMG approaches in a structured setting. In this work, we show how to extend the adaptive multigrid methodology to the BoxMG setting. This extension not only retains the favorable properties of the adaptive framework, but also sheds light on the relationship between BoxMG and AMG. In particular, we show how BoxMG can be viewed as a special case of classical AMG, and how this viewpoint leads to a richer family of adaptive BoxMG approaches.




next up previous
Next: About this document ...
Copper Mountain Conference 2011-02-20