Abstract - Various models are currently applied to predict the dispersion of leaked combustible gas and overpressure from a vapor cloud explosion(VCE). However, those models use simple approaches where top-ography and barriers of anti-leakage facilities and the effects of buildings were not sufficiently taken into considerations. For this reason, this study has proposed the dispersion process of leaked gas, distribution pat-terns, and flames and overpressure generated from gas explosions in 2D and 3D virtual spaces by reviewing more accurately analyzable computational fluid dynamics (CFD) model by considering various variables in-cluding combustion types of leaked substances, geometry of facility, warm currents, barriers, the influence of wind, and others. The CFD analysis results are anticipated to be usefully applied for the risk analysis of ex-plosion and for the risk-based design.Key words : VCE(vapor cloud explosion), CFD(computational fluid dynamics), risk analysis 1) † 교신저자:hmkwon@kosha.netKIGAS Vol. 16, No. 5, pp 58~65, 2012 http://dx.doi.org/10.7842/kigas.2012.16.5.58(Journal of the Korean Institute of Gas)