  We introduce ClimateMachine, a new open-source atmosphere modeling framework
using the Julia language to be performance portable on central processing units
(CPUs) and graphics processing units (GPUs). ClimateMachine uses a common
framework both for coarser-resolution global simulations and for
high-resolution, limited-area large-eddy simulations (LES). Here, we
demonstrate the LES configuration of the atmosphere model in canonical
benchmark cases and atmospheric flows, using an energy-conserving nodal
discontinuous-Galerkin (DG) discretization of the governing equations.
Resolution dependence, conservation characteristics and scaling metrics are
examined in comparison with existing LES codes. They demonstrate the utility of
ClimateMachine as a modelling tool for limited-area LES flow configurations.
