Direct Numerical Simulation of polydisperse evaporating sprays in 3D jet configuration using Euler-Euler and Euler-Lagrange formalisms
Résumé
The use of robust and accurate Eulerian/Eulerian formulations in the modeling of reactive two-phase flow would be a major step forward in the framework of turbulent combustion modeling with massively parallel supercomputers. In the present contribution we rely on the recent developments conducted in the framework of homogeneous isotropic turbulence (Fréret et al. 2010; Fréret et al. 2012) using the Eulerian multi-fluid model (MF) in the context of Direct Numerical Simulation (DNS) to capture all stages of turbulent spray combustion for polydisperse sprays, and set up a 3D free jet configuration, thus reaching the next step of turbulent shear flows. The robustness and accuracy of the model and related numerical methods are evaluated and assessed on two configurations with non-evaporating and evaporating spray injection. With MF, we obtain the same level of accuracy as a baseline solution obtained with Lagrangian droplet tracking for rather similar computational time on a few hundred processors. This study yields a solid premise for the future 3D reacting configurations.
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