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Méthode multi-échelle pour la résolution des équations de la cinétique neutronique

Abstract : In this PhD thesis and in order to improve the time/precision ratio of the numerical simulation calculations, we investigate multi-scale techniques for the resolution of the reactor kinetics equations. We choose to focus on the mixed dual diffusion approximation and the quasi-static methods.
We introduce a space dependency for the amplitude function which only depends on the time variable in the standard quasi-static context. With this new factorization, we develop two mixed dual problems which can be solved with CEA's solver MINOS. An algorithm is implemented,
performing the resolution of these problems defined on different scales (for time and space). We name this approach: the Local Quasi-Static method.
We present here this new multi-scale approach and its implementation. The inherent details of amplitude and shape treatments are discussed and justified. Results and performances, compared to MINOS, are studied. They illustrate the improvement on the time/precision ratio for kinetics calculations. Furthermore, we open some new possibilities to parallelize computations with MINOS. For the future, we also introduce some improvement tracks with adaptive scales.
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https://tel.archives-ouvertes.fr/tel-00348435
Contributor : Steve Chauvet <>
Submitted on : Friday, December 19, 2008 - 12:15:41 AM
Last modification on : Friday, October 23, 2020 - 4:52:09 PM
Long-term archiving on: : Tuesday, June 8, 2010 - 5:53:33 PM

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  • HAL Id : tel-00348435, version 1

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Steve Chauvet. Méthode multi-échelle pour la résolution des équations de la cinétique neutronique. Modélisation et simulation. Université de Nantes, 2008. Français. ⟨tel-00348435⟩

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