Hello,
could anyone tell me a few details regarding the Carpet prolongation operators? It appears there's no real documentation about them. Looking at Carpet source code I can see these operators are available:
none sync restrict copy Lagrange ENO ENOVOL WENO TVD Lagrange_monotone STAGGER011 STAGGER101 STAGGER110 STAGGER111
The "polynomial" ones (Lagrange, ENO, etc) appear to be self explanatory, more or less. I'm particularly interested in the exact behaviour of "none", "sync" and "copy". "none" and "sync" are the same thing apparently. I find the "restrict" operator very confusing, since these are supposed to take care of prolongation.
I'm asking because in a thorn I'm working on, a certain GF has prolongation set to "None". This resulted in buffer zones on finer grids not to be initialized (full of NaNs) when switching on mesh refinement. Although I think I found a workaround, I'd like to take care of this by using some already provided mechanism, if available.
Thank you very much, Federico Guercilena