@inproceedings{7c22eecb539d436fbdbf67797c39e678,
title = "Optimization of Full-Core Reactor Simulations on Summit",
abstract = "Nek5000/RS, a highly-performant open-source spectral element code, has recently achieved an unprecedented milestone in the simulation of nuclear reactors: the first full core computational fluid dynamics simulations of reactor cores, including pebble beds with 352,625 pebbles and 98M spectral elements (51 billion gridpoints), advanced in less than 0.25 seconds per Navier-Stokes timestep. The authors present performance and optimization considerations necessary to achieve this milestone when running on all of Summit. These optimizations led to a fourfold reduction in time-to-solution, making it possible to perform high-fidelity simulations of a single flow-through time in less than six hours for a full reactor core under prototypical conditions.",
keywords = "Exascale, Incompressible Navier-Stokes, Nek5000, NekRS, Scalability, Spectral Element",
author = "Misun Min and Lan, \{Yu Hsiang\} and Paul Fischer and Elia Merzari and Stefan Kerkemeier and Malachi Phillips and Thilina Rathnayake and April Novak and Derek Gaston and Noel Chalmers and Tim Warburton",
note = "This material is based upon work supported by the U.S. Department of Energy, Office of Science, under contract DE-AC02-06CH11357 and by the Exascale Computing Project (17-SC-20-SC). The research used resources at the Oak Ridge Leadership Computing Facility at Oak Ridge National Laboratory, which is supported by the Office of Science of the U.S. Department of Energy under Contract DE-AC05-00OR22725. ∗Corresponding author; 2022 International Conference for High Performance Computing, Networking, Storage and Analysis, SC 2022 ; Conference date: 13-11-2022 Through 18-11-2022",
year = "2022",
doi = "10.1109/SC41404.2022.00079",
language = "English (US)",
series = "International Conference for High Performance Computing, Networking, Storage and Analysis, SC",
publisher = "IEEE Computer Society",
booktitle = "Proceedings of SC 2022",
}