DOUG
0.2
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DOUG - Domain Decomposition on Unstructured Grids.
Smoothed Coarse Spaces
This is done after fine aggregates are found (see
Aggregation
).
Input
Set of (
non-overlapping) aggregates
Output
Restriction matrix
, Interpolation matrix
and coarse matrix
Form the aggregate projector operator
, where
Form the restriction operator
, with
(applying
times a damped Jacobi smoother); aggregates grow by
layers as well, forming overlaps
Form the coarse problem matrix
through sparse matrix multiplication
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