Développement d'une méthode compressible avec évaporation pour la simulation d'interface résolue dans le cadre de l'atomisation.

Abstract : This PhD thesis shows the development of a numerical method for solving two-phase flows with vaporisation. A coupling between Level Set and VOF methods is realised for the interface capturing. In order to solve fluid mechanics equations, a pressure based method is employed and, to decouple velocity and pressure, a projection method is performed. This method allows the implicitation of the acoustic terms and the time step constraint reduction. Liquid and gas are considered as compressible allowing local density variations with equations of state. The vaporisation is computed in two different ways ; a first one where the vaporisation rate is constant and a second one, where this rate is calculated by thermodynamics. Along with this topic, a study on curvature distribution in a liquid injection configuration is realised. This study allows to extend the drop size distribution concept in a spray and to improve available informations on ELSA model. Finally, an other study is performed on thedevelopment of a criterion, based on interface curvatures, which estimates the quality of a simulation.
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Romain Canu. Développement d'une méthode compressible avec évaporation pour la simulation d'interface résolue dans le cadre de l'atomisation.. Mécanique des fluides [physics.class-ph]. Normandie Université, 2019. Français. ⟨NNT : 2019NORMR016⟩. ⟨tel-02271925⟩

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