Computing methods for perturbation corner forces in electron pressure,ion pressure and photon pressure are investigated.We propose two kinds of subzonal pressure method for Lagrangian algorithm of two-dimensional three-temperature radiation hydrodynamics.Numerical tests show that both methods work well in eliminating unphysical deformation of Lagrangian mesh.

The indirectly driven high convergence implosions is numerically simulated using 2D Lagrangian code named Lared Ⅰ.These implosions were characterized by a variety of measurements,and computer models are in good agreement with the measurements.

A nine point difference scheme and iteration solving method is presented for two dimensional energy equations with three temperatures, in numerical simulation of driven implosion by laser. Some results are given as well.

Physical experiments and numerical calculation of point source are important for studying reactor shielding and radiation effect, and for investigating the neutron parameters and computaional methods. In this paper, several typical physical experiments about point source of 14 MeV neutron have been calculated by the two-dimensional discontinuous finite element procedure. The calculated results are compared with the experimental resuts. The agrecement is satisfactory.