We study formation and development of laser-induced heating,melting and evaporating process during laser-matter interaction. Local adaptive mesh refine method in two-dimensional structured code is adopted as soon as material evaporates along the direction of laser. Wilkins method and finite volume diffusion scheme based on reconstruction of values on vertex are adopted to handle momentum equations and energy equation.

Nine.point scheme for diffusion equation on distorted quadrilateral is discussed.Based on a classical nine。point scheme, and with continuity of diffusion flux, a formula for designed for computing Vertex unknowns. Numerical experiments show that the scheme is robust,and the accuracy is higher than that of other weighted methods for diffusion problem with continuous or discontinuous coefficient on distorted meshes.

A method that decreases useless magnetism pressure to amplify the power of MFCG(magnetic flux compression generator) is proposed, in which the charging loop is cut off after initial current is provided.By code MFCG(V),the simulation demonstrates effectiveness of the method.

An analytical scheme for the initial transient process in a simple helical flux compression generator, which includes distribution of the magnetic field in the hollow of the armature and current density in the helical stator, is derived with diffusion equations. The relationship among frequency of conducting current,roots of the characteristic Bessel equation and decay time in the armature is discussed. The skin depth in the helical stator is calculated and is compared with an approximation widely used in the magnetic diffusion process. Our analytical result is helpful to understand mechanism of the loss of magnetic flux in both armature and stator and makes significant suggestions to optimal designing performance of the helical flux compression generator.