Validering av FDS för simulering av mindre vätgasläckage inomhus

Sammanfattning: The prevailing global climate transition is incentivized to occur in a short period of time. Hydrogen is considered a pivotal element towards a renewable energy system. However, the physical and chemical properties of hydrogen give rise to the risk of fire and explosion. This risk must be evaluated as hydrogen becomes increasingly integrated into society. This paper aims to investigate whether the Computational Fluid Dynamics (CFD) program FDS can be utilized to dimension the natural ventilation of minor hydrogen leaks. Experimental data was generated to provide validation, which was subsequently compared to simulated data produced by FDS. The results demonstrate that the Computational Fluid Dynamics (CFD) program FDS is capable of dimensioning natural ventilation for emissions with larger opening sizes, resulting in lower velocities. Under the applied ventilation conditions, FDS tends to overestimate the concentration level, which appears to act as a safety margin. Additionally, the results establish that the precision in concentration measurements produced by FDS increases with larger ventilation areas. For emissions with smaller opening sizes that generate higher velocities, the FDS model encounters difficulties in computing representative values