2015-10-272015-10-272015-07-12ICES-2015-105http://hdl.handle.net/2346/64382Bellevue, WashingtonTyler Ball, Paragon Space Development Corporation, USAJohn Fricker, Oceaneering Space Systems, USAThe 45th International Conference on Environmental Systems was held in Bellevue, Washington, USA on 12 July 2015 through 16 July 2015.A computational fluid dynamics (CFD) analysis of water intrusion into the EMU was performed in order to provide a means to visualize and simulate events such as the mishap of July 16, 2013. While several approaches exist for modeling multiphase flow with CFD, the Volume of Fluid (VOF) approach was selected due to its ability to include important features such as surface tension and wall adhesion. Five cases were run and the results of each case were presented and the water transport for each of the five cases was presented in detail. In general, the phenomena associated with water transport (cohesion, adhesion, and capillary effects) were shown to occur in each of the simulations. The water tended to adhere to regions with very low contact angles and regions with high surface contact (i.e. concave surfaces created by ears and jaw line). Some globules were shown to remain in a location for several minutes while others had dynamic movements over only a few seconds. This model helped to confirm and shed new light on what may have happened in the mishap. The model illustrated how water moved around the helmet, including how it accumulated and was ejected from the vent inlet which had not been seen before.application/pdfengPresentation