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E3SM V1
V1 uses topography on a GLL grid with a laplacing smoothing. The smoothing reduces the effective resolution of the topography from 2dx to 6.4dx. (effective resolution is determined by the first wavelength to be damped by 50% from the unsmoothed topography, computed via spherical harmonic spectra)
V1 only needs data on the GLL grid.
Tool chain: V1 Topography: GLL grids Requires cube_to_target, homme_tool, and a SCRIP file for the grid.
V1 has poor treatment of topography and compensates in part with increased divergence damping.
E3SM V2
V2 needs topography on the GLL grid, and then a consistent topography on the PG2 grid (created with the same GLL->PG2 algorithm used internally)
V2 uses the same smoothing as V1: 50% damping of the 6.4dx wavelength.
Tool chain: Special Considerations for FV Physics GridsV2 Topography: GLL/PG2 grids
V2 has improved topography treatment over V1. V2 configurations do not need to run with increased divergence damping.
E3SM V3
V3 needs topography on the GLL grid, and then a consistent topography on the PG2 grid (created with the same GLL->PG2 algorithm used internally)
V3 has improved pressure gradient and viscosity treatment over V2 and will be using a significantly rougher topography.
This tool chain has not been finalized yet.