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• W1771182508 abstract "Abstract. The recently developed 3-D TenStream radiative transfer solver was integrated into the University of California, Los Angeles large-eddy simulation (UCLA-LES) cloud-resolving model. This work documents the overall performance of the TenStream solver as well as the technical challenges of migrating from 1-D schemes to 3-D schemes. In particular the employed Monte Carlo spectral integration needed to be reexamined in conjunction with 3-D radiative transfer. Despite the fact that the spectral sampling has to be performed uniformly over the whole domain, we find that the Monte Carlo spectral integration remains valid. To understand the performance characteristics of the coupled TenStream solver, we conducted weak as well as strong-scaling experiments. In this context, we investigate two matrix preconditioner: geometric algebraic multigrid preconditioning (GAMG) and block Jacobi incomplete LU (ILU) factorization and find that algebraic multigrid preconditioning performs well for complex scenes and highly parallelized simulations. The TenStream solver is tested for up to 4096 cores and shows a parallel scaling efficiency of 80–90 % on various supercomputers. Compared to the widely employed 1-D delta-Eddington two-stream solver, the computational costs for the radiative transfer solver alone increases by a factor of 5–10." @default.
• W1771182508 created "2016-06-24" @default.
• W1771182508 creator A5081191398 @default.
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• W1771182508 date "2016-04-15" @default.
• W1771182508 modified "2023-09-25" @default.
• W1771182508 title "3-D radiative transfer in large-eddy simulations – experiences coupling the TenStream solver to the UCLA-LES" @default.
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• W1771182508 doi "https://doi.org/10.5194/gmd-9-1413-2016" @default.
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