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Theses

Couplage et synchronisation de modèles dans un code scénario d’accidents graves dans les réacteurs nucléaires

Abstract : This thesis focuses on solving coupled problems of models of interest for the simulation of severe accidents in nuclear reactors~: these coarse-grained models allow for fast calculations for 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. Besides, 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 solved with coupled lumped parameter models and coupled 1D models. Numerical results are discussed and allow us to emphasize the benefits of using the designed coupling schemes instead of the usual explicit coupling schemes.
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Submitted on : Thursday, October 25, 2018 - 3:32:27 PM
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Louis Viot. Couplage et synchronisation de modèles dans un code scénario d’accidents graves dans les réacteurs nucléaires. Analyse numérique [math.NA]. Université Paris Saclay (COmUE), 2018. Français. ⟨NNT : 2018SACLN033⟩. ⟨tel-01905094⟩

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