A coupling method is developed to describe field-structure interaction.Eulerian multi-material hydrodynamic code is used to simulate fluid field.Lagrangian hydrodynamic finite element code is used to calculate response of structures.Coupling technology is made to merge these two codes.Technology to speed calculation and to avoid mismatch of fluid structure meshs and structure meshs are given.Dynamic response and shock wave propagation within an explosion containment vessel are simulated.Fluid-structure coupling algorithm is used for analyzing coupling of explosion field and structures.It indicates that the method has the ability of simulating fluidstructures interation.

A simple model for DNA molecules is proposed.The dynamical mechanism of the nonlinear localized excitation is studied by Runge-Kutta method.The large amplitude motion is simulated for N coupling base pairs of DNA molecules.The physical picture of the nonlinear localized excitation and its stable propagation can be emerged by means of adopting suitable parameters of Hamiltonian and time stpe.The nonlinear interaction on the beather effect is also discussed.

The random thickness of particulate matter is treated by Monte-Carlo Method.It is an improtant part of the Monte-Carlo study of the random geometry.Three kinds of the random thickness of Raschig Ring are studied here.

Fritiof code system is a general-purpose international code in particle physics. It simulates the hadron-hadron, hadron-nuclei and nuclei-nuclei collision process with Monte Carlo method. A brief introduction is given to its theortical model, functions and characters, the implantation, development and applications of the code.