Abstract: Based on the CFD theory, a discrete phase model (DPM) was developed using FLUENT for digital simulation. By comparing different explosive load factor β and ventilation system, the motion law and concentration of PM₁₀ particles were analyzed. Finally, this paper studied the effect of ventilation system on particle dispersion and provided a theoretical reference to the radiological protection and emergency response to dirty bomb incidence.

Key words: dirty bombs, cloud diffusion, DPM, particulate matter