Abstract
This work presents a methodology to coarsen subchannel models to accelerate large-scale Serpent2-SUBCHANFLOW calculations. The method is based on first building a fully detailed subchannel model and then combining subchannels into larger channels with condensed hydraulic parameters. To quantify the accuracy and performance of this scheme, a full-core VVER-1000 problem is simulated with Serpent2-SUBCHANFLOW using two types of coarsened models, as well as a standard subchannel model as reference.
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García, M., Ferraro, D., Valtavirta, V., Tuominen, R., Imke, U., Mercatali, L., … Leppänen, J. (2020). A subchannel coarsening method for Serpent2-SUBCHANFLOW applied to a full-core VVER problem. In International Conference on Physics of Reactors: Transition to a Scalable Nuclear Future, PHYSOR 2020 (Vol. 2020-March, pp. 1049–1056). EDP Sciences - Web of Conferences. https://doi.org/10.1051/epjconf/202124706018
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