Ndim:2

cartesian_uniform_2d cartesianfinite_difference DD2Dxygrad_normvarcoeff_laplacian dirichletneumannperiodiczero_fluxzero_gradient
Uniform 2-D Cartesian grid with consumer-supplied extent: NX by NY cell-centered points, cell centers (x_i, y_j) = (x0 + (i - 1/2) dx, y0 + (j - 1/2) dy).
duo duofinite_volume arc_lengthbasis_coscorner_fillcrossflux_divergencehalo_extendkinetic_energymetricmomentum_umomentum_vpgrad_direct_upgrad_direct_vpgrad_l97_upgrad_l97_vreconstructriemannspherical_angletangentupwindwavespeedwind_assywind_rotatewind_solve duo
Generic gnomonic cubed-sphere grid with the duo-grid halo system of Chen (2021): six N-by-N tiles interlocked in the 'staircase' arrangement, 6 N^2 cells, unstaggered (A-grid) so every prognostic variable is collocated at cell centres.
latlon finite_differencefinite_volumelatlon DD2laplacian periodiczero_gradient
Uniform longitude-latitude grid with consumer-supplied extent (global or regional).
mpas finite_volumempas divgradlaplacian none
MPAS unstructured spherical centroidal-Voronoi (icosahedral) C-grid on the unit sphere: NCELLS Voronoi cells, NEDGES edges, NVERTICES triangle vertices, with cell valence bounded by MAXEDGES (on a closed sphere the Euler relations give NEDGES = 3*(NCELLS - 2) and NVERTICES = 2*(NCELLS - 2), but the three counts stay independent metaparameters so planar or open meshes can reuse the file).