Hybrid Eulerian/Lagrangian 3D methods for high Reynolds number reactive flows

Abstract

Research in advanced combustion modeling is critical to developing control strategies for optimized propulsion systems, especially with regard to stability, emissions, and power density. Examining combustion dynamics and control using numerical simulations, however, presents several challenges, given the multiscale and multiphysics nature of the underlying flows. This thesis presents progresses in combustion modeling for the numerical simulation of turbulent reactive jet flows through the design of a hybrid Eulerian/Lagrangian and massively parallel 3D numerical simulation tool. The adaptivity of the resulting software yields truly fast and accurate simulations, and a better understanding of the simulated combustion processes. The transverse jet vorticity dynamics at high Reynolds numbers are first described, and more specifically the unsteady interactions between the wall boundary layer and the jet. We then present actuation strategies that manipulate the jet penetration and spread via simple nozzle-edge perturbations. Finally, the adaptive Eulerian/Lagrangian code is used to provide a detailed understanding of flame anchoring mechanisms in transverse reactive jets.