2020

García, Manuel; Ferraro, Diego; Valtavirta, Ville; Tuominen, Riku; Imke, Uwe; Mercatali, Luigi; Sanchez-Espinoza, Victor; Leppänen, Jaakko

<p>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.</p>