This demonstration presents results from a GOTHIC calculation for a hydrogen plume being released into a room filled with air. The central portion of the 3-D plot volume has been removed to make the plume visible.

At the beginning of the simulation the ventilation system is off, so the plume rises quickly to the ceiling, spreads out and begins filling the room with hydrogen from the top down. About half way through the transient, the ventilation system is turned on. The ventilation system consists of an inlet vent on the upper left side of the room and an outlet vent on the lower right side of the room. With the room ventilation active, hydrogen concentrations are visibly decreased near the ventilation inlet and the plume itself is deflected by the incoming air at the left side of the room.