ERF solves the compressible Navier-Stokes on a Arakawa C-grid for large-scale weather modeling.
ERF is built on AMReX, an adaptive mesh refinement software framework, which provides the underlying software infrastructure for block structured AMR operations. The full AMReX documentation can be found here and the tutorials can be found here.
ERF is designed to run on machines from laptops to multicore CPU and hybrid CPU/GPU systems.
For details on the equations that ERF solves, see the theory section.