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DTSTART;TZID=America/Denver:20231115T160000
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UID:submissions.supercomputing.org_SC23_sess297_gb106@linklings.com
SUMMARY:Exploring the Ultimate Regime of Turbulent Rayleigh–Bénard Convect
 ion through Unprecedented Spectral-Element Simulations
DESCRIPTION:Niclas Jansson, Martin Karp, Adalberto Perez, and Timofey Mukh
 a (KTH Royal Institute of Technology, Sweden); Yi Ju (Max Planck Computing
  and Data Facility); Jiahui Liu and Szilárd Páll (KTH Royal Institute of T
 echnology, Sweden); Erwin Laure (Max Planck Computing and Data Facility); 
 Tino Weinkauf (KTH Royal Institute of Technology, Sweden); Jörg Schumacher
  (Technische Universität Ilmenau); Philipp Schlatter (Friedrich-Alexander 
 University, Erlangen-Nuremberg; KTH Royal Institute of Technology, Sweden)
 ; and Stefano Markidis (KTH Royal Institute of Technology, Sweden)\n\nWe d
 etail our developments in the high-fidelity spectral-element code Neko tha
 t are essential for unprecedented large-scale direct numerical simulations
  of fully developed turbulence. Major innovations are modular multi-backen
 d design enabling performance portability across a wide range of GPUs and 
 CPUs, a GPU-optimized preconditioner with task overlapping for the pressur
 e-Poisson equation and in-situ data compression. We carry out initial runs
  of Rayleigh–Bénard Convection (RBC) at extreme scale on the LUMI and Leon
 ardo supercomputers. We show how Neko is able to strongly scale to 16,384 
 GPUs and obtain results that are not possible without careful consideratio
 n and optimization of the entire simulation workflow. These developments i
 n Neko will help resolving the long-standing question regarding the ultima
 te regime in RBC.\n\nRegistration Category: Tech Program Reg Pass\n\nSessi
 on Chair: Barbara Chapman (Hewlett Packard Enterprise (HPE), Stony Brook U
 niversity)\n\n
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