Numerical simulation for gas contaminant movement and distribution inside compartment with overpressure protection

To investigate the gas contaminant movement and distribution inside compartment with overpressure ventilation system, based on computational fluid dynamics (CFD) and an indoor zeroequation turbulence model, simulates the transient velocity and concentration distribution of tracing gas CO2 and analyses the whole process in the compartment being contaminated. The results indicate that the volume fraction of CO2 reduces rapidly from 0.005 to 0.000 1 in 120 seconds after starting up the overpressure ventilation system and the compartment ventilation system can satisfy the requirement of contaminant dilution.