Digital transformation of droplet/aerosol infection risk assessment realized on "Fugaku" for the fight against COVID-19

Abstract

The fastest supercomputer in 2020, Fugaku, has not only achieved digital transformation of epidemiology in allowing end-to-end, detailed quantitative modeling of COVID-19 transmissions for the first time, but also transformed the behavior of the entire Japanese public through its detailed analysis of transmission risks in multitudes of societal situations entailing heavy risks. A novel aerosol simulation methodology was synthesized out of a combination of a new CFD methods meeting industrial demands, CUBE [8], which not only allowed the simulations to scale massively with high resolution required for micrometer virus-containing aerosol particles, but also extremely rapid time-to-solution due to its ability to generate the digital twins representing multitudes of societal situations in minutes not week, attaining true overall application high performance; such simulations have been running for the past 1.5 years on Fugaku, cumulatively consuming top supercomputer-class resources and the result communicated by the media as well as becoming official public policies. Keywords COVID-19 • Computational fluid dynamics • Building cube method • Immersed boundary method • Dirty CAD • Droplet/Aerosol transmission • societal behavioral change * All authors are listed in alphabetical order by surnames.

Gamify Stencil Dwarf on Cloud for Democratizing Scientific Computing

“…C(VR) Folding [34] Polyhedral Folding C(VR) Tetris (CPU) Tessellate Skewed 2 C(VR) Brick [66] Brick Scatter G(CCU) AN5D [37] Temporal -G(CCU) Tetris (GPU) Checkerboard Trapezoid G(TCU) Tetris Polymorphic Template C(VR) + G(TCU) 1 For better clarity, CPU, GPU, Vector Register, CUDA Core Units and Tensor Core Units are abbreviated with C, G, VR, CCU and TCU respectively. 2 Notice we use a keyword as an abbreviation for some algorithms.…”

“…as solving genetic mysteries on Summit [44], exploring seismic simulation on Sunway Taihulight [18], and creating COVID-19 epidemic models on Fugaku [2], which utilize supercomputers to make significant progress.…”