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

High resolution modeling of the aerosolization process for relatively large liquid jets is needed to quantify the dispersion of hazardous chemical or biological agents from damaged/punctured containers. A second application is the prediction of thedistribution of neutralization agents injected into clouds of hazardous chemical or biological agents. A high fidelity model is needed to provide accurate prediction of droplet location, size, and velocity distributions near the injection location whichwill typically have a first order effect on the larger scale distribution of the droplet cloud.In Phase I, CFD Research Corporation (CFDRC) has demonstrated the feasibility of combining an innovative marker point approach with an advanced jet atomization model, resulting in high resolution, computationally efficient simulations that are fullycoupled between liquid and gas phases. The marker point approach provides for explicit simulation of the liquid jet core and resolution of the gas flow around the liquid jet. In Phase II, the model will be enhanced by solving the governing equations forthe arbitrary liquid core flow with consideration of jet cross-sectional deformation. Additional submodels for Large Eddy Simulation (LES) turbulence-spray interaction and droplet collision/coalescence will be included. High quality experimental data formodule validation will be obtained. Finally, the completed liquid jet, atomization, and spray module will be transferred to the Air Force for implementation in an Air Force CFD code.