This report presents an analysis of a database from computational simulations of a droplet-laden mixing layer (i.e., evaporating droplets of a liquid fuel in air) undergoing a transition to turbulence. The basic governing equations were those of transport of discrete droplets through a flowing gas; the droplets were followed in a Lagrangian frame whereas the gas was followed in an Eulerian frame. The analysis involved the extraction of subgrid scale (SGS) models from flow fields generated using the direct numerical simulation (DNS) approach, in which the governing equations are solved directly at the relevant length scales.
This work was done by Josette Bellan and Nora Okong'o of Caltech for NASA's Jet Propulsion Laboratory. To obtain a copy of the report, " A Priori Subgrid Analysis of Temporal Mixing Layers with Evaporating Droplets," access the Technical Support Package (TSP) free on0line at www.nasatech.com/tsp under the Physical Sciences category