CFD simulation of heavy gas dispersion in ventilated rooms and validation by tracing experiments
L. Ricciardi, C. Prévost, L. Bouilloux, R. Sestier-Carlin - Tracer 4, 3-5/10/06, Autrans-France.
In order to improve the risk assessment related to accidental release of UF6 (high density product used in some nuclear facilities), IRSN has conducted an experimental and numerical study on heavy gas dispersion in ventilated rooms. This study relies on upward injections of large amounts of SF6 (heavy tracer gas) inside two different ventilated rooms. About twenty experimental configurations have been performed by varying the injection and ventilation conditions. Gas stratification is highlighted in all cases, even for small concentrations, and comparison between simulation and experiment shows a good agreement, especially during the gas injection and for low flow velocities inside the rooms. Nevertheless, complementary studies remain to be carried out in order to explain some phenomena, such as sudden concentrations decrease.