Highlights  Study on pressure peaking for ignited hydrogen releases in enclosures  Description and validation of CFD model for ignited pressure peaking phenomena  Focuses on a small-scale validation case and a real scale residential garage  Heat transfer, vent size and release rate impact on the pressure peak  Pressure peak for ignited release 2 orders of magnitude greater than unignited case *Highlights (for review)

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Highlights Hydrogen release from onboard storage in a covered car park is numerically investigated  Release and dispersions from a range of TPRD diameters is simulated  A 0.5 mm diameter TPRD was found to be inherently safer for 700 bar storage  The angle of TPRD release was shown to have implications for passenger egress  Results support the inherently safe design of hydrogen fuel cell vehicles *Highlights (for review)

Highlights 1. Overpressure due to ignited hydrogen release in a garage examined 2. Pressure due to ignited and unignited release in enclosure compared 3. Pressure from ignited release two orders of magnitude greater than unignited 4. Phenomenon should be considered by regulators and engineers *Highlights (for review)