On 10/4/24 01:38, 'yy.wayne' via deal.II User Group wrote:
**
I tried by SSOR gives same behavior as jacobi.
For mesh with 0, 1, and 2 times of refinement, it needs (jacobi: 20, 31, 67)
and (SSOR: 10, 15, 31) iterations.
Besides, is SSOR not applicable in matrix-free framework?
Yes, SSOR needs access to matrix elements. If these iteration counts are too
large for you, then the only alternative you have is to go with multigrid-type
preconditioners, for which you can use matrix-free methods.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
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