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Modélisation de l'interaction combustible-réfrigérant : fragmentation et explosion de vapeur

Abstract : Simulation of fuel-coolant interaction at mesoscale involve unsteady coupled phenomena. In this context, fine fragmentation of fuel during a vapor explosion is modeled by closure laws. To enhance reliability and predictability of these laws, it is now possible to consider detailed simulations to study the local phenomena involved. This PhD, as the first work of this project, had for goals to set the modelisation context and the first software developments of micro-SCONE. It is a code dedicated on the understanding of local phenomena involved in small scale vapor explosions. For this purpose, we proposed a development plan oriented towards compressibility, heat transfers and phase change effects. Compressible diffuse interface models family has been chosen. However, some declinaisons of models in this family exist based upon equilibrium hypothesis which can make them unsuitable for our application. In particular, in this work, we have demonstrated the inability of the thermomecanical equilibrium model to meet our needs. Thereafter, the mecanical equilibrium model has been selected and expanded to take into account conduction heat transfer. Then, this model has been coupled to a phase change method based on Gibbs potential equilibrium. Finally, this work has settled the fundamentals of the micro-SCONE software and has contributed to the development of multiphase flow models for small scale vapor explosion simulations.
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Submitted on : Thursday, October 15, 2020 - 4:00:32 PM
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  • HAL Id : tel-02968308, version 1

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Gabriel Gay. Modélisation de l'interaction combustible-réfrigérant : fragmentation et explosion de vapeur. Mécanique des fluides [physics.class-ph]. Aix Marseille Université, 2020. Français. ⟨tel-02968308⟩

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