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Simulation numérique d'ondes de choc dans un milieu bifluide : application à l'explosion vapeur

Abstract : This thesis studies numerical simulation of steam explosion. This phenomenon correspond to a fast vaporization of a liquid leading to a pressure shock. It is of interest in the nuclear safety field. During a core-meltdown crisis, molten fuel rods interacting with water could lead to steam explosion. Consequently we want to evaluate the risks created by this phenomenon.In order to do it, we use Euler equations written in a Lagrangian form. This description has the advantage of following the fluid motion and consequently preserves interfaces between the liquid and its vapor. To solve these equations, we develop a new Godunov type scheme using nodal fluxes. The nodal solver developed here only depends on the angular repartition of the physical variables around the node.Moreover, we study liquid-vapor phase changes. We describe a method to take it into account and highlight the advantages of using this method into a Lagrangian framework.
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https://tel.archives-ouvertes.fr/tel-01661506
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Submitted on : Tuesday, December 12, 2017 - 12:44:56 AM
Last modification on : Thursday, September 19, 2019 - 3:32:16 PM

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  • HAL Id : tel-01661506, version 1

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Théo Corot. Simulation numérique d'ondes de choc dans un milieu bifluide : application à l'explosion vapeur. Analyse numérique [math.NA]. Conservatoire national des arts et metiers - CNAM, 2017. Français. ⟨NNT : 2017CNAM1125⟩. ⟨tel-01661506⟩

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