NekRS, a GPU-accelerated spectral element Navier–Stokes solver

The development of NekRS, a GPU-oriented thermal-fluids simulation code based on the spectral element method (SEM) is described. For performance portability, open concurrent compute abstraction and leverages scalable developments in SEM Nek5000 libParanumal, which library high-performance kernels for high-order discretizations PDE-based miniapps. Critical sections Navier–Stokes time advancement are addressed. Performance results several platforms presented, including scaling to 27,648 V100s OLCF Summit, calculations up 60B grid points (240B degrees-of-freedom).