Non-uniform Refinement Ratios

[aerojpapp]

Hello,

I noticed that the ref_ratio is a vector of IntVect's and can theoretically allow for non-uniform refinement in each direction. However, in the Fortran interface routine "F_Interfaces/AmrCore/AMReX_FAmrCore.cpp" there is an explicit check to make sure that the refinement ratio is uniform in all directions. Going on a hunch that this was because there were no Fortran interfaces that allow for non-uniform refinement ratios, I created new Fortran interfaces for amrex_average_down, amrex_fillpatch, and amrex_fillcoarsepatch to allow for a vector definition of ref_ratio (rr is passed in as a pointer which is then assigned to an IntVect which then uses the default C/C++ interfaces). However, I think there are some more subtleties that I'm missing because I can't refine more than 1 or 2 levels without getting NaN and Inf values. Can the pure C++ version of AMReX use non-uniform refinement ratios and if so, what do I need to account for when using the Fortran interfaces (non-uniform blocking factors, non-uniform ghost cells during multi-fab construction, etc.)? I'm not adverse to adding/modifying Fortran interfaces if that is the only issue. I'm using the current 24.02 tagged version.

Thanks,

John