无界单元在地下水流计算中的应用

在人为选定的模拟无限边界的有限位置处设置无界单元。在该单元上配置带有衰减特征的线性插值函数,进而可建立按有限元法或不规则网格有限差分法解算地下水流问题所需要的单元刚度矩阵。该单元刚度矩阵可很容易地进入总刚度矩阵。无界单元的应用较好地解决了地下水流数值模拟中无限边界不易确定的问题。计算实例表明本方法具有较高的精度。

APPLYING INFINITE DOMAIN ELEMENT TO COMPUTE OF THE GROUNDWATER FLOW

Infinite domain element is set up on definite place which is chosen artificially to model infinite boundary. Linear interpolation function with decay feature is composed for the element, and the element stiffness matrix may be defined to solve the groundwater flow problem using FEM or DM of irregular net. The element stiffness matrix can be added to total stiffness matrix easily. The applicafion of infinite domain element has solved the problem of infinite boundary which is difficult to define in groundwater flow numerical modeling. The numerical example proves that the method has higher precision.