High Resolution Simulation of Liquid Jet Ejection and Aerosolization for Chemical/Biological Defense

"High resolution modeling of the ejection of liquid payloads is needed to compliment and improve the design of weapons that will inject neutralization agents into clouds of hazardous chemical or biological agents. A high fidelity model, which currently doesnot exist (especially for relatively large diameter jets), is needed to provide accurate prediction of droplet location, size, and velocity distributions near the injection location which will usually have a first order effect on the larger scaledistribution of the aerosolized neutralization agent. CFD Research Corporation (CFDRC) will develop such a model through the innovative coupling of several advanced modeling capabilities including: 1) Volume of Fluid (VOF), two-phase enthalpy method, andmesh-embedding technique for modeling the dynamic and turbulent formation of the liquid jet core will be evaluated, 2) aerosolization modeling correlated to the liquid jet turbulence, 3) secondary breakup of the initial droplets, 4) dispersion of thedroplet field using Large Eddy Simulation (LES). In Phase I, existing models will be coupled in CFDRC's commercial CFD software, CFD?ACE+, and preliminary validation will be performed. In Phase II, the model will be enhanced by implementing a two-phase LEScapability and an innovative two-phase enthalpy model. Experimental data will be collected as necessary to enable much more extensive validation of the model. The final product of this SBIR proje