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DTSTAMP:20260615T072747Z
LOCATION:Bldg. 8 - Room B 101
DTSTART;TZID=Europe/Stockholm:20260701T103000
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UID:submissions.pasc-conference.org_PASC26_sess155_msa107@linklings.com
SUMMARY:Multi-Physics Geophysical Flow Simulations Using JustRelax.jl
DESCRIPTION:Pascal S. Aellig (Johannes Gutenberg University Mainz), Albert
  de Montserrat (ETH Zurich), Ludovic Räss (University of Lausanne), Boris 
 J. P. Kaus (Johannes Gutenberg University Mainz), and Christian Schuler (U
 niversity of Lausanne)\n\nSimulating the solid Earth's thermo-mechanical e
 volution requires solving coupled, non-linear Stokes and heat-diffusion pr
 oblems across large domains with sharp material contrasts, complex non-lin
 ear visco-elasto-plastic rheologies, and long time scales. Traditionally, 
 these simulations run on High-Performance Computing (HPC) machines due to 
 their substantial memory and computational demands. As HPC centres transit
 ion away from CPU-only architectures toward GPU-accelerated systems, large
  legacy codes written originally for CPU architectures face extensive rewr
 iting and optimisation efforts.\nTo address this, we present JustRelax.jl,
  an open-source, highly portable Julia package for geodynamic modelling. I
 t employs the matrix-free Accelerated Pseudo-Transient (APT) method to sol
 ve the Stokes and heat-diffusion equations, making it well-suited to explo
 it modern GPU hardware while remaining fully functional on CPUs.\n JustRel
 ax.jl exposes a high-level API while remaining highly modular, building up
 on a suite of packages developed within the (∂)GPU4GEO project. GeoParams.
 jl handles solver-agnostic rheology calculations, while JustPIC.jl manages
  advection via a multi-XPU Particles-in-Cell scheme specialised for stagge
 red grids. Backend portability is achieved through ParallelStencil.jl's ar
 chitecture-agnostic kernel abstractions, and distributed-memory communicat
 ion is managed by ImplicitGlobalGrid.jl via MPI. JustRelax.jl demonstrates
  near-perfect algorithmic weak scaling in both 2D and 3D up to 512 GPUs, e
 nabling us to perform large-scale geodynamic simulations on modern HPC mac
 hines.\n\nDomain: Climate, Weather, and Earth Sciences, Physics, Computati
 onal Methods and Applied Mathematics\n\nSession Chairs: Ludovic Raess (Uni
 versity of Lausanne, ETH Zurich) and Samuel Omlin (ETH Zurich / CSCS)\n\n
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