CFD benchmark on hydrogen release and dispersion in confined, naturally ventilated space with one vent

• Published in: International journal of hydrogen energy 2015-02, Vol.40 (5), p.2415-2429
• Main Authors: Giannissi, S.G., Shentsov, V., Melideo, D., Cariteau, B., Baraldi, D., Venetsanos, A.G., Molkov, V.
• Format: Article
• Language: English
• Subjects: Benchmark; CFD; Enclosure; Hydrogen safety; Natural ventilation; Release and dispersion
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2014.12.013

A CFD benchmark was performed within the HyIndoor project, to study hydrogen release and dispersion in a confined space with natural ventilation and one vent. Three experiments, performed earlier by CEA at their GAMELAN 1 m3 facility, were considered for this benchmark. In all three tests helium (instead of hydrogen for safety reasons) was released vertically upwards at 60 NL/min from a 20 mm orifice near the centre of the enclosure. A different vent size was used for each test. Three HyIndoor partners (JRC, NCSRD and UU) participated in the benchmark, with three different CFD codes, (ANSYS Fluent, ADREA-HF and ANSYS CFX) and three different turbulence models respectively (transitional SST, standard k-ε, dynamic Smagorinski LES). In general, good agreement was found between predicted and measured helium concentrations. However, in the case of the vent with the smallest vertical extension (vent c) all predictions overestimate the concentration at the lower part of the enclosure at steady state. [Display omitted] •CFD benchmark on H2 dispersion in closed, naturally ventilated box with 1 vent.•Three different turbulence models were tested: SST transitional, k-ε and LES model.•All predictions exhibit overall good agreement with the experiment.•Better performance by all models in the cases with larger vent vertical extension.•CFD models can be used successfully for the development of guidelines for the safe use of H2 in similar indoor configurations.