I understand now. Thank for your answer. best, :) Alan
> 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.
