Multi-material eulerian formulations and hydrocode for the simulation of explosions

A multi-material Eulerian hydrodynamic numerical method and hydrocode that can effectively simulate explosion problems in engineering practice were developed in this study. A modified Youngs' interface reconstruction algorithm was proposed for mixed cells, in which the material's volume fractions of the surrounding cells are not only used to reconstruct the material interface but also adopted to determine the transport order of the material. The algorithm developed herein was validated by the modeling of several tests, such as objects with different shapes moving in translational, rotating and shear flow field in two dimensional Descartes coordinates and axis-symmetric cylindrical coordinates. Results show that convergence is indeed obtained. Moreover, the explosion problem in the tunnel with an expansion-chamber and the jet formation of shaped charge were numerically simulated, and the numerical results show good agreement with the observed experimental data.