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International Journal for Multiscale Computational Engineering
インパクトファクター: 1.016 5年インパクトファクター: 1.194 SJR: 0.554 SNIP: 0.68 CiteScore™: 1.18

ISSN 印刷: 1543-1649
ISSN オンライン: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.2018025643
pages 555-577

SOLVING COUPLED PROBLEMS OF LUMPED PARAMETER MODELS IN A PLATFORM FOR SEVERE ACCIDENTS IN NUCLEAR REACTORS

Louis Viot
CEA, DEN, DTN/SMTA/LMAG, Cadarache, F-13108 Saint-Paul-lez-Durance, France
L. Saas
CEA, DEN, DTN/SMTA/LMAG, Cadarache, F-13108 Saint-Paul-lez-Durance, France
F. De Vuyst
LMAC EA 2222, UTC, Sorbonne Universités, 60200 Compiégne, France

要約

Coupled problems of lumped parameter models are of interest for the simulation of severe accidents in nuclear reactors at system levels. These coarse-grained models allow for both quick statistical analysis used for risk assessment and solutions of large problems when considering the whole severe accident scenario. However, this modeling approach has several numerical flaws. In this industrial context, computational efficiency is of great importance, leading to various numerical constraints. The objective of this research is to analyze the applicability of explicit coupling strategies to solve such coupled problems and to design implicit coupling schemes allowing stable and accurate computations. The proposed schemes are theoretically analyzed and tested within CEA's PROCOR platform on a problem of heat conduction and ablation that is representative of severe accidents in light water reactors. This problem is solved with coupled 0D lumped parameter models and coupled 1D models. Numerical results are discussed about the benefits of using the designed coupling schemes instead of the usual explicit coupling schemes.