Simulations of Hydrogen Releases from a Storage Tanks- Dispersion and Consequences of Ignition

We present results from hydrogen dispersion simulations from a pressurized reservoir at constant flow rate, in the presence and absence of a wall. The dispersion simulations are performed using a commercial finite volume solver. Validation of the approach is discussed. Constant concentration envelopes corresponding to the 2%, 4% and 15% hydrogen concentration in air are calculated for a subcritical vertical jet and for an equivalent subcritical horizontal jet from a high pressure reservoir. The consequences of ignition and the resulting overpressure are calculated for subcritical horizontal and vertical hydrogen jets and in the latter case, compared to available experimental data.