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DTSTART;TZID=Europe/Paris:20230601T170000
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DTSTAMP:20260511T193223
CREATED:20230531T133230Z
LAST-MODIFIED:20230531T133356Z
UID:277-1685638800-1685640600@ceec-coe.eu
SUMMARY:Neko: A Modern\, Portable\, and Scalable Framework for High-Fidelity Computational Fluid Dynamics
DESCRIPTION:Recent trends and advancements including more diverse and heterogeneous hardware in High-Performance Computing are challenging scientific software developers in their pursuit of good performance and efficient numerical methods. As a result\, the well-known maxim “software outlives hardware” may no longer necessarily hold true\, and researchers are today forced to re-factor their codes to leverage these powerful new heterogeneous systems. We present Neko – a portable framework for high-fidelity spectral element flow simulations. Unlike prior works\, Neko adopts a modern object-oriented Fortran 2008 approach\, allowing multi-tier abstractions of the solver stack and facilitating various hardware backends ranging from general-purpose processors\, accelerators down to exotic vector processors and Field-Programmable Gate Arrays (FPGAs) via Neko’s device abstraction layer. Focusing on the performance and accuracy of Neko\, we show the first direct numerical simulation (DNS) of a Flettner rotor submerged in a turbulent boundary layer\, observing excellent agreement of lift with experimental data. Using a mesh with five million spectral elements\, which turns into more than a billion unique degrees of freedom\, the simulation requires less than three days to complete on accelerated systems compared to weeks on traditional non-accelerated systems. Finally\, we present performance measurements on a wide range of accelerated computing platforms\, including the EuroHPC pre-exascale system LUMI\, where Neko achieves excellent parallel efficiency for a large DNS of turbulent fluid flow using up to 80% of the entire LUMI supercomputer.
URL:https://ceec-coe.eu/event/neko-a-modern-portable-and-scalable-framework-for-high-fidelity-computational-fluid-dynamics/
CATEGORIES:Conference
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