Improving multigrid for 3-D electro-magnetic diffusion on stretched grids
More Info
expand_more
expand_more
Abstract
We evaluated multigrid techniques for 3D diffusive electromagnetism. The Maxwell equations and Ohm's law were discretised on stretched grids, with stretching in all coordinate directions. We compared standard multigrid to alternative multigrid approaches with linewise smoothing and semi-coarsening, both as a stand-alone solver and as a preconditioner. Although the number of iterations was small for some variants, none of the schemes showed grid-independent convergence rates on stretched grids.
Files
Jonsthovel.pdf
(pdf | 0.947 Mb)