Spangler, C. A., Hilbing, J. H. and Heister, S. D., "Nonlinear Modeling of Jet Atomization in the Wind-Induced Regime," Physics of Fluids, V7, No. 5, pp. 964-971, 1995.

Hilbing, J. H., Heister, S. D., and Spangler, C. A., "A Boundary Element Method for Atomization of a Finite Liquid Jet," Atomization and Sprays, V5, No. 6, pp. 621-638, 1995.

Hilbing, J. H. and Heister, S. D., "Droplet Size Control in Liquid Jet Breakup," To Appear, Physics of Fluids, 1996.

Chen, Y. and Heister, S. D., "Two-Phase Modeling of Cavitated Flows," Computers and Fluids, Vol. 24, 1995.

Chen, Y. and Heister, S. D., "Modeling Hydrodynamic Non-Equilibrium in Bubbly and Cavitating Flows," Journal of Fluids Engineering, Vol. 118, 1995.

Chen, Y. and Heister, S. D., "Modeling Cavitating Flows in Diesel Injectors," Atomization and Sprays, Vol. 6, 1996.

The AFOSR is currently sponsoring research aimed at increasing the understanding of the role of atomization processes in liquid rocket engine combustion instabilities. To this end, we have developed a series of models, based on Boundary Element Methods, in order to describe the nonlinear evolution of liquid jets and droplets under arbitrary unsteady conditions. To date, axisymmetric and 2-D simulations have been conducted; there is an interest in extending the models to fully 3-D flowfields. The models have the advantage of providing a high-resolution treatment of the surface capable of extending calculations beyond atomization events.

In addition to these efforts, models have been developed to assess internal flows in injector passageways. From a practical perspective, the design of this passage is one of the few parameters available to the designer to influence the flow outside the orifice. The present efforts have focused on flows in which there are substantial cavitation effects inside the passage; a factor which complicates the basic physics dramatically. Under partial sponsorship of Cummins Engines and NSF, this work has focused on the use of a single fluid model through the incorporation of a "pseudodensity" which varies continuously between liquid and vapor extremes. We have recently developed a constitutive relation for this parameter which properly reflects nonequilibrium hydrodynamic processes which can be important in these flows.

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