Reduced-Order Modeling of Hydrogen Releases from Vent Stacks and with Wind

This report describes computational modeling in the HyRAM+ software for study of hydrogen behavior in two common scenarios. First, models of unignited plumes exiting a vent stack were considered. It was shown that entrainment and vent backpressure were major factors in plume physics. Second, HyRAM+ was extended to include wind effects on plumes by modifying the plume momentum balance and entrainment modeling. Use of the model showed that plume shape and length changed with wind speed and direction; in all cases, wind causes a shortening of the plume along the streamline. While the no-wind case in HyRAM+ has been validated and the newly developed wind model was fitted to very limited experimental data, more controlled experimental configurations would help validate the models and ensure accurate simulation of hydrogen plume behavior for vent stack releases or in wind.. Authors: Louie, Melissa Sui-hui [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)]; Devin, Michael Carl [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)] (ORCID:0000000244633905); Hecht, Ethan Starling [Sandia National Laboratories (SNL-CA), Livermore, CA (United States)]; Ehrhart, Brian David [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)]. DOE Contract: NA0003525. Subjects: 08 HYDROGEN