Couplages multi-physiques : évaluation des impacts méthodologiques lors de simulations de couplages neutronique/thermique/mécanique.

Cyril Patricot 1
1 LPEC - Laboratoire de Protection d'Etudes et de Conception
SERMA - Service des Réacteurs et de Mathématiques Appliquées : DEN/DM2S/SERMA
Abstract : The objective of this thesis is to study coupling techniques between neutron transport, heat transfer and mechanics. First, a very general review of coupling techniques in the literature was done. Then we worked on neutron transport simulations in wrapped cores. Most of current deterministic codes for neutron transport are not able to deal with deformed geometry. This kind of computations is however of special interest for fast neutrons reactors and is a prerequisite for our planned coupling study.Two approaches were identified and implemented to take into account core deformations, using respectively mobile and fixed meshing. They were tested and compared on the flowering tests of the reactor Phenix. The coupling itself was studied afterwards, on the Godiva experiment. It was chosen because of the direct, strong and time-dependent coupling it involves. On this case, the “quasi-static” factorization of neutron flux was shown to be an effective way to couple a space- and time-dependent neutron transport solver with another discipline. We also investigated the development of a unique multiphysics solver. The well-known Newton algorithm applied to the discretized forms of the coupled equations was shown to be an efficient tool, which could be generalized to other couplings.This thesis therefore leads, on the one hand, to a better understanding of the physics of deformed cores and to operational tools to simulate these effects, and on the other hand, to very general advices for multiphysics calculations.
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Cyril Patricot. Couplages multi-physiques : évaluation des impacts méthodologiques lors de simulations de couplages neutronique/thermique/mécanique.. Analyse numérique [math.NA]. Université Paris-Saclay, 2016. Français. ⟨NNT : 2016SACLX007⟩. ⟨tel-01355622⟩

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