The dimensions and the periodicity of the grid are hard-coded. It
is therefore compulsory to recompile for each new configuration.
The information can be found in the par_ORCA*.h90 in the model
sources you are using.

ORCA1:
jpi = 362
jpj = 292
jpiglo = 362
nperio = 6

ORCA025:
jpi = 1442
jpj = 1021
jpiglo = 1442
nperio = 4