IMPROVED ANISOTROPIC LINEAR SOURCE FORMULATION FOR MULTIPHYSICS PROBLEMS
| Autor: | Brendan Kochunas, Thomas J. Downar, Andrew Fitzgerald, Nicholas F. Herring |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Work (thermodynamics)
linear source 010308 nuclear & particles physics mpact Multiphysics lifa Physics QC1-999 Isotropy 01 natural sciences Cross section (physics) multiphysics Method of characteristics 0103 physical sciences Code (cryptography) Applied mathematics 010306 general physics Reduction (mathematics) Anisotropy moc Mathematics |
| Zdroj: | EPJ Web of Conferences, Vol 247, p 03003 (2021) |
| Popis: | This work seeks to extend an existing formulation of the method of characteristics with linear source approximation for problems with dynamic cross sections. The previous formulation eliminated cross section dependence of precomputed coefficients for systems with an isotropic source. The method is extended to include a formulation for spatially flat anisotropic scattering that eliminates cross section dependence of precomputed coefficients without adding additional operations; increasing efficiency in multiphysics simulations where cross sections can be subject to change. The new formulation is implemented in the MPACT code and tested on two problems: 3D transport assembly calculations using MPACT’s 2D/1D method and a 3D assembly with T/H feedback using MPACT’s 2D/1D method coupled with COBRA-TF. This work demonstrates that the new linear source formulation allows for the number of mesh elements to be significantly reduced while maintaining accuracy, leading to shorter run-times for 3D cases with fixed cross sections, and substantial reduction of memory usage for 3D cases with fixed cross sections. The multiphysics calculations show similar runtimes for the same accuracy with significant reduction of memory. For similar accuracy, the method proved effective in reducingmemory usage by, on average, 30% for 3D problems and 21% for multiphysics problems. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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