Simulations of Evolving Transitional Mixing Layers

A report describes direct numerical simulations of single- and two-phase, temporally developing transitional mixing layers at Reynolds numbers (based on the initial vorticity thickness and mean velocity difference) from 200 to 600. As many as 300 × 332 ×180 grid points were used to discretize the gas phase. As many as 5.7 ×106 individual evaporating droplets of various sizes, present in liquid-to-gas mass ratios between 0 and 0.5, were tracked in a Lagrangian reference frame. The gas phase was described by the Navier-Stokes equations for a compressible fluid, augmented by species-transport equations and by the energy equation.