在中心区域采用离散元分析，其周围区域采用有限差分法分析。
The DEM is used in the focus zone, and the finite difference method is used in the surrounding zone.
采用离散元方法，对喷动流化床内的颗粒混合特性进行了三维直接数值模拟。
Numerical simulations on particle mixing characteristics of spout-fluid bed were carried out in three dimensional based on discrete element method (DEM).
采用离散元方法中的动态松驰技术，在无须组装整体渗透矩阵的情况下求解裂隙网格各结点的水头值。
The dynamic relaxation technique in discrete element method is introduced to solve the permeability field without assembling the global matrix.
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