与导体目标一样，先建立介质目标的几何模型，然后用三角形面元模拟介质表面。

As well as the conducting target, the geometrical model of the dielectric target should first be built, then triangular patches are used to model the surface of the dielectric target.

youdao

另一方面，对裂隙单元进行三角形单元的有限元网格划分，运用变分原理导出裂隙单元的渗流有限元求解方程。

On the other hand, the fracture elements are discretized into triangular mesh, and the flow finite element equations are derived based on the variational principle.

youdao