• CFD
• OpenFOAM
• Hydrogen
• Combustion
• TFC
• ETFC
• GTFC
• ENACCEF

Hydrogen deflagration poses a severe threat to the structural integrity of the reactor safety systems and the reactor containment in case of severe accident scenarios, where large quantities of hydrogen in the containment may be released, from both in-vessel and ex-vessel sources. The risk associated to the failure of the containment can be assessed in detail through the uses of a CFD codes, that can simulate the hydrogen combustion during severe accidents, by providing detailed three-dimension transient predictions when compared to one-dimensional system codes. A CFD solver was recently validated to evaluate the flame characteristics from a deflagration detonation scenario, under homogeneous mixture conditions using RANS approaches. In the present work, the recent development in an improved CFD solver are summarized. More specifically, the effects of non-homogeneity in the mixture are included and results are validated against available experimental data. Numerical results are presented and analyzed in terms of flame front development and propagation, as well as temporal evolution of the pressure for different combustion models, showing the benefits of the extended formulation against the original one.