A multiscale algorithm with element/mesh momentum transfer of parameters and variable information exchange in coupling transition zone between discrete element method (DEM) and finite element method (FEM) is deduced.Multiscale computation of time and space with coupling of DEM and FEM is established.The algorithm and the model are applied to damage of a pre-tensioned aluminum plate under laser irradiation.Compared with results in FEM model,multiscale model of space and multiscale model of time and space,the multiscale model of time and space by coupling DEM and FEM is shown accurate and highly efficient.Damage of a pre-tensioned aluminum plate under laser irradiation is simulated in multiscale model of time and space from macro-and meso-scale.Simulated results are coincident with experimental resuts.

A general Godunov finite difference scheme—WENO(Weighted Essentially Non-Oscillatory) scheme with fifth-order accuracy is used to calculate 2-dimensional axis symmetrical laser-supported plasma flow field under laser ablated solid target,considering ionization degree of plasma and the interaction and coupling between laser beam and plasma.Evolution of the ablation plasma due to the interaction between laser and solid target is obtained.The simulation shows that the laser beam is strong absorbed by plasma on target surface,and the velocity of LSD(Laser Supported Detonation) wave is half of the ideal LSD derived with C-J detonation theory.