Alan <zhenglun.wei at gmail.com> writes: > Thanks, Dr. Knepley, > Can I treat AMG and MG like this way. To solve problems with > non-symmetric matrices, MG needs users to provide the coarse mesh > information. This take more complexity on coding than using AMG; but MG, > generally, do better job than MG for non-symmetric problems.
It's hard to generalize. FAS multigrid with conservative discretizations and element agglomeration is popular for transport-dominated problems like steady-state transonic flows. Other geometric MG schemes could perform worse than a given algebraic multigrid.
