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Développement de méthodes multi-échelles pour la simulation numérique des écoulements réactifs diphasiques

Abstract : The main goal of this PhD dissertation is to discuss the numerical methods that have been developed and implemented in a DNS code associated to a Lagrangian tracking procedure for dispersed phase. These numerical methods allow for an optimization of the Lagrangian tracking of the droplets in a parallel computing environment and allow for a very large domain to be simulated. A procedure to include an immersed body of any geometry in the midst of the simulation domain has been implemented. A dedicated collision algorithm has also been developed that models the droplet/droplet and droplet/IBM (Immersed Boundary Method) interactions. These numerical methods allows to simulate numerous physical phenomena to obtain detailed statistics in many complex configurations amongst which problem of droplet interweaving or flame front propagation in an evaporating spray. A detailed comparison between this Lagrangian method and a Eulerian approach is shown. The consistency between these two methods demonstrates the capability of the Eulerian method to accurately capture complex physical phenomena. This Eulerian method is foreseen to have a better computational cost than the Lagrangian method when running on massively parallel architectures.
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  • HAL Id : tel-00683632, version 3


Olivier Thomine. Développement de méthodes multi-échelles pour la simulation numérique des écoulements réactifs diphasiques. Dynamique des Fluides [physics.flu-dyn]. Université de Rouen, 2011. Français. ⟨tel-00683632v3⟩



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