Numerical Simulation of Compressible Reactive Flow: Diffraction around a 90° Corner

The work presented here is mainly concerned with the ability to capture the correct physical behaviors of an inviscid flow model studying Detonation and Deflagrations to Detonations Transition (DDT). Inviscid and viscous numerical results concerning the detonation front propagating over a sudden expansion are presented. The analysis provides a transparent and revealing qualitative and quantitative understanding that the usual arguments employed to support the validity of the inviscid flow model become increasingly weaker in a reactive environment, a fact that may have deep implication in the context of the prediction of accidental explosions.