Year: 2026
Type: preprint
Abstract: Rayleigh-Bénard convection (RBC) is a model for turbulent flow and challenging to simulate by direct numerical simulation (DNS). Adequate resolution of all relevant length scales requires very fine grids in space and stability restrictions can dictate small step sizes. In this paper, we investigate the use of parallel spectral deferred correction (SDC) as a high-order time-stepping method to reduce wall-clock times of direct numerical simulation of RBC. Performance results on JUSUF (CPUs) and JUPITER (GPUs) with two different codes show parallel SDC can offer some concurrency along the temporal axis plus larger maximum stable time steps. Taken together, this allows for a reduction of wall-clock time required for simulations over one free-fall time by having to compute fewer steps and being able to mitigate the higher cost per time step through temporal parallelization.
Source: arXiv (Cornell University)
Institutions: Forschungszentrum Jülich, Hamburg University of Technology
Language: English
Subfield: Computational Mechanics
Field: Engineering
Domain: Physical Sciences
Open Access status: green
Awards: Verbundprojekt: Leistungsverbesserung des ICON-O Ozeanmodells auf heterogenen Exascale-Supercomputern mit Methoden des Maschinellen Lernens - ExaOcean -, Verbundprojekt: TIME-X - Parallelisierung zeitabhängiger Simulationen für das zukünftige Supercomputing, TIME parallelisation: for eXascale computing and beyond, G5349391467, G6966446605, Innovative Algorithms for Applications on European Exascale Supercomputers
OpenAlex ID: W7221819018