It presents some numerical methods to simulate the complicated behavior of the plasma flow in laser hohlraum target, Which include adaptive technique of the meshes and moving grid method, etc. The calculated results show that these methods are effective.

A method of couple node velocity is given for reducing distortion of quadrilateral mesh in Lagrangian numerical computation of two dimensional compressible hydrodynamics. It is verified that this method is equivalent to introducing four order smooth term with dissipation property in the momentum equation, thus it plays a role of damping the unphysical oscillation of velocity.

The nine point scheme of refrence(1) is considered and computational scheme of general boundary condition is presented.Numerical test results show that these refinements improved the precision of calculated results.

In view of the complexities of laser cavity target flow, a numerical technique is presented that couples an Eulerian approximation with a Lagrangian approximation,onedimensional calculation with two dimensional calculation. We call it EL-1D2D method. On the basis of trace interface moving grid method, some particular technique is established mainly by setting an Eulerian line and by merging the zone adaptively beside the Eulerian line. Numerical results show that this method can calculated fairly complicated flow in the cavity and get reasonable physical image.

EPM method for two dimensional elastic-plastic hydrodynamic calculation, which couples Eulerian and Lagrangian methods, is presented in this paper. The difference scheme is constructed by means of contour integral. This method includes sliding interfaces treatment, several generating meshes technique, and so on. It can be widely applied to calculations of many hydrodynamic problems.