Turbulence simulations at grid resolution up to $32768^3$ enabled by Exascale computing

A GPU-enabled extreme scale turbulence simulations capability recently developed on the 1.1 Exaflop leadership-class supercomputer (named Frontier) is now available for computing homogeneous turbulence at very high resolution, with very favorable performance characteristics. This new simulation tool has been used to perform a series of new simulations of forced isotropic turbulence, at grid resolutions from $2048^3$ to $32768^3$. High Reynolds numbers up to 2500 based on the Taylor scale are reached by reducing viscosity along with progressive grid refinement. Expected results will include energy spectra, velocity structure functions, and the statistics of highly intermittent fluctuations of the energy dissipation rate and enstrophy.