A 1D–3D mixed method for the numerical simulation of blast waves in confined geometries

Blast wave generated by a high detonating spherical charge and propagating in confined domains is modeled using the Euler equations. The problem is split into two parts. The first calculation part relies on spherical isotropy to solve the problem in the radial component. Overpressure distribution is presented and shows a very good agreement with experimental and numerical data. The one-dimensional data need to be made three-dimensional mesh-compatible thanks to an appropriate remapping technique. To this end, a remapping technique is presented and its effectiveness, accuracy and efficiency are demonstrated. The second calculation part consists of a three-dimensional computation fed with the remapped data. The effectiveness of this mixed approach is demonstrated through three-dimensional applications in confined domains.