Exascale Simulations of Fusion and Fission Systems
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866914959737225216 |
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| author | Min, Misun Lan, Yu-Hsiang Fischer, Paul Merzari, Elia Nguyen, Tri Yuan, Haomin Shriwise, Patrick Kerkemeier, Stefan Davis, Andrew Dubas, Aleksandr Eardly, Rupert Akers, Rob Rathnayake, Thilina Warburton, Tim |
| author_facet | Min, Misun Lan, Yu-Hsiang Fischer, Paul Merzari, Elia Nguyen, Tri Yuan, Haomin Shriwise, Patrick Kerkemeier, Stefan Davis, Andrew Dubas, Aleksandr Eardly, Rupert Akers, Rob Rathnayake, Thilina Warburton, Tim |
| contents | We discuss pioneering heat and fluid flow simulations of fusion and fission energy systems with NekRS on exascale computing facilities, including Frontier and Aurora. The Argonne-based code, NekRS, is a highly-performant open-source code for the simulation of incompressible and low-Mach fluid flow, heat transfer, and combustion with a particular focus on turbulent flows in complex domains. It is based on rapidly convergent high-order spectral element discretizations that feature minimal numerical dissipation and dispersion. State-of-the-art multilevel preconditioners, efficient high-order time-splitting methods, and runtime-adaptive communication strategies are built on a fast OCCA-based kernel library, libParanumal, to provide scalability and portability across the spectrum of current and future high-performance computing platforms. On Frontier, Nek5000/RS has achieved an unprecedented milestone in breaching over 1 trillion degrees of freedom with the spectral element methods for the simulation of the CHIMERA fusion technology testing platform. We also demonstrate for the first time the use of high-order overset grids at scale. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_19119 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Exascale Simulations of Fusion and Fission Systems Min, Misun Lan, Yu-Hsiang Fischer, Paul Merzari, Elia Nguyen, Tri Yuan, Haomin Shriwise, Patrick Kerkemeier, Stefan Davis, Andrew Dubas, Aleksandr Eardly, Rupert Akers, Rob Rathnayake, Thilina Warburton, Tim Computational Engineering, Finance, and Science 35-04 G.4; I.6 We discuss pioneering heat and fluid flow simulations of fusion and fission energy systems with NekRS on exascale computing facilities, including Frontier and Aurora. The Argonne-based code, NekRS, is a highly-performant open-source code for the simulation of incompressible and low-Mach fluid flow, heat transfer, and combustion with a particular focus on turbulent flows in complex domains. It is based on rapidly convergent high-order spectral element discretizations that feature minimal numerical dissipation and dispersion. State-of-the-art multilevel preconditioners, efficient high-order time-splitting methods, and runtime-adaptive communication strategies are built on a fast OCCA-based kernel library, libParanumal, to provide scalability and portability across the spectrum of current and future high-performance computing platforms. On Frontier, Nek5000/RS has achieved an unprecedented milestone in breaching over 1 trillion degrees of freedom with the spectral element methods for the simulation of the CHIMERA fusion technology testing platform. We also demonstrate for the first time the use of high-order overset grids at scale. |
| title | Exascale Simulations of Fusion and Fission Systems |
| topic | Computational Engineering, Finance, and Science 35-04 G.4; I.6 |
| url | https://arxiv.org/abs/2409.19119 |