Two different ways are used to stabilize the numerical oscillations in predicting the mean pressures on large-span roofs: artificial viscosity techniques and low-order upwind scheme.

In order to improve the numerical simulation of an underwater blast wave, some parameters which have effect on the simulation, such as equation of state(EOS), element density and artificial viscosity, were analyzed.

In this scheme, through a proper modification of the additional terms, relative to the general Galerkin FEM formulation which was generated from the transformation of high order temporal derivatives in the Taylor expansion of the first order time derivatives to spatial derivates, the real effect of artificial viscosity is introduced.

This paper presented an analytical model of tunnel-soil-fluid interaction taking account of nonlinear material behavior of soil,viscous-spring artificial boundary and solid-fluid interaction.

Under the viscous-spring artificial boundary condition,the input method of seismis wave from the artificial boundary is compared with that from the surface of the dam foundation,and the r.

Application of viscous-spring artificial boundary to seismic analysis of gravity dam;

The stiffness and damping matrixes of 3D consistent artificial boundary are deduced through viscous-spring artificial boundary theory.

The equivalent viscous-spring artificial boundary elements were developed by comparing the matrix of the general finite element and the consistent viscous-spring artificial boundaries.

Three-dimensional visco-elastic artificial boundary equations along normal and tangent directions are derived based on three-dimensional wave motion equations.

The model of pile raft foundation and three-dimension visco-elastic artificial boundary are imported to construct reasonable FEM mod.

Pile-soil-transmission tower coupled system is set up with visco-elastic artificial boundary as the soil boundary and modified Goodman element as the pile-soil interaction face.