! Overflow test case with an embedded zoom
! J. Chanut December 2020
!
! ** Compilation: ./makenemo -a OVERFLOW add_key "key_agrif"
! ** Files contained in that directory override the ones in EXPREF
! ** OVF_domcfg.nc and 1_OVF_domcfg.nc files containing parent and child domain
!    definitions are needed. These need to be suitably matched !
! ** The zoom, as defined in the shipped in AGRIF_FixedGrids.in file, has an
!    horizontal and temporal refinement of 4 in the x direction only and a vertical
!    refinement of 2 (both parent and child have geopotential vertical grids).
!    Have a look at the figure "Overflow_agrif.png".
! ** Warning: The domain has only 5 points in the y directio and automatic
!    definition of mpp layout (i.e. jpni=jpnj=0) fails in that case. One has
!    to manually define jpni=your_number_of_process and jpnj=1.