> On Feb 29, 2016, at 5:36 PM, Mark Adams <[email protected]> wrote: > > > GAMG is use for AMR problems like this a lot in BISICLES. > > Thanks for the reference. However, a quick look at their paper suggests they > are using a finite volume discretization which should be symmetric and avoid > all the shenanigans I'm going through! > > No, they are not symmetric. FV is even worse than vertex centered methods. > The BCs and the C-F interfaces add non-symmetry.
If you use a different discretization, it is possible to make the c-f interface discretization symmetric --- but symmetry appears to come at a cost of the reduction in the formal order of accuracy in the flux along the c-f interface. I can probably dig up some code that would make it easy to compare. -- Boyce
