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DOI 10.5286/stfctr.2025002
Persistent URL http://purl.org/net/epubs/work/60343935
Record Status Checked
Record Id 60343935
Title Development of Subchannel CFD for Prismatic HTGR Fuel Assemblies
Contributors
Abstract This work presents a coarse-grid Computational Fluid Dynamics (CFD) approach, initially developed for light-water reactors and now extended to prismatic High- Temperature Gas-cooled Reactor (HTGR) fuel assemblies. This method, known as Subchannel CFD (SubChCFD), combines the strengths of traditional subchannel codes and CFD. It offers CFD-like 3-D predictions while ensuring integral consistency of the results with well-calibrated empirical correlations. The use of a coarse mesh results in a substantial reduction in computational costs by up to 1 to 3 orders of magnitude compared to conventional CFD, depending on the turbulence model used. This potentially enables cost-effective simulations to be carried out at the reactor core scale. To validate the expanded capability of SubChCFD, the modular HTGR fuel assembly designed by General Atomics is selected for case study. Simulation results demonstrate that SubChCFD aligns well with conventional Reynolds-Averaged Navier-Stokes approaches at a significantly lower computing cost.
Organisation STFC , SCI-COMP
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Licence Information: Creative Commons Attribution 4.0 International (CC BY 4.0)
Language English (EN)
Type Details URI(s) Local file(s) Year
Report STFC Technical Reports STFC-TR-2025-002. STFC, 2025. STFC-TR-2025-002.pdf 2025