ID 355

All-Mach Solver for Large-Eddy Simulation of Liquid Jet in Supersonic Crossflow

 

Abstract:

Compressible atomization is a crucial aspect of scramjet engine fuel injection. Numerical simulations have potential to illuminate the underlying physics and guide engineering design, but multiple obstacles inhibit accuracy and efficiency. Compressible flow solvers capable of handling shocks and phase interfaces rely on dissipative numerics, which hinders the modeling of subgrid-scale turbulence. To reduce the numerical dissipation added by the numerical method, we use a hybrid framework. We capture discontinuities like shocks and interfaces with a finite volume semi-Lagrangian method that includes an unsplit volume-of-fluid technique (Owkes and Desjardins, JCP 2014), and use a simple, low dissipation, skew-symmetric scheme for the other parts of the flow domain. To provide the versatility needed for transonic and low-mach flows, we utilize an implicit equation for pressure, following Kwatra et al. (JCP 2009), allowing us to avoid any acoustic CFL limitation. We simulate a liquid jet in supersonic crossflow and provide a solver suitable for implementing sub-grid scale models for turbulence.