TY - GEN
T1 - Optimization of Full-Core Reactor Simulations on Summit
AU - Min, Misun
AU - Lan, Yu Hsiang
AU - Fischer, Paul
AU - Merzari, Elia
AU - Kerkemeier, Stefan
AU - Phillips, Malachi
AU - Rathnayake, Thilina
AU - Novak, April
AU - Gaston, Derek
AU - Chalmers, Noel
AU - Warburton, Tim
N1 - Funding Information:
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
Publisher Copyright:
© 2022 IEEE.
PY - 2023/2/23
Y1 - 2023/2/23
N2 - 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.
AB - 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.
KW - Exascale
KW - Incompressible Navier-Stokes
KW - Nek5000
KW - NekRS
KW - Scalability
KW - Spectral Element
UR - https://www.scopus.com/pages/publications/85149298041
UR - https://www.mendeley.com/catalogue/1d242b01-55b9-381a-84bc-ccfc009f6867/
U2 - 10.1109/SC41404.2022.00079
DO - 10.1109/SC41404.2022.00079
M3 - Conference contribution
AN - SCOPUS:85149298041
SN - 9781665454445
T3 - International Conference for High Performance Computing, Networking, Storage and Analysis, SC
SP - 74:1-74:11
BT - International Conference for High Performance Computing, Networking, Storage and Analysis, SC
PB - IEEE Computer Society
T2 - 2022 International Conference for High Performance Computing, Networking, Storage and Analysis, SC 2022
Y2 - 13 November 2022 through 18 November 2022
ER -