Fluid mechanics:

• Fully 3d, unsteady, incompressible simulation
• Multiple grids and variable grid spacing allowing large domains ( ~1 km) with fine spacing (< 1 m) where needed. Typically ~ 2.5x10⁶ grid points.
• Subgrid turbulence model including buoyancy and rotational effects

Ice parameterization:

• Bulk microphysics in terms of total water, ice mass, and ice crystal number density
• Includes: diffusional growth/sublimation, sedimentation, buoyancy due to latent heat release, perturbation pressure effects.
• Not included in current simulations: ice nucleation, coalescence, radiation, or "multi bin" ice spectrum.