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DOE OSTI · 3015174

Recent progress on coarse graining simulations

Grinstein, Fernando F․ [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)] (ORCID:0000000304427936)·Chiravalle, Vincent P․ [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)] (ORCID:0000000230325637)·Greene, Robert K. [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)]
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Abstract

We focus on coarse graining simulations based on the primary conservation equations, effectively codesigned physics and algorithms, and low-Mach-number corrected (LMC) hydrodynamics. Simulation methods involve LANL’s x-Radiation-Adaptive-Grid-Eulerian Large-Eddy Simulation, Besnard-Harlow-Rauenzahn (BHR) Reynolds-Averaged Navier-Stokes (RANS) approach, and Dynamic BHR – a paradigm bridging RANS and LES. A relevant question addressed relates to whether 3D RANS and RANS/LES hybrids – the industry standards for aerospace and automotive research, are presently relevant for practical variable-density applications involving shocked and accelerated interface instabilities. Furthermore, recent simulations of the GaTECH inclined mixing-layer shock-tube and NIF ICF-capsule experiments are used to demonstrate issues, challenges, and potential for 3D coarse grained LMC simulation strategies for robustly simulating complex transitional and coupled hydrodynamics-multiphysics with coarser resolution. Present LES readiness to provide accurate predictions at scale is demonstrated – whereas 3D RANS and RANS/LES bridging do not appear impactful in this context.

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Grinstein, Fernando F․ [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)] (ORCID:0000000304427936), Chiravalle, Vincent P․ [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)] (ORCID:0000000230325637), Greene, Robert K. [Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)]. 2026-01-22. Recent progress on coarse graining simulations. https://doi.org/10.1016/j.physd.2026.135116

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