The discrete element method (DEM) is introduced, which includes hard sphere model and soft sphere model.

着重介绍了非连续介质模型中的离散元法(dem)：硬球模型和软球模型。

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The density profile of hard sphere fluid confined in two parallel hard walls was studied by using Rosenfeld density Functional Theory (DFT) and Molecular Dynamics (MD) simulation method.

利用密度泛函理论和分子动力学方法，对处于两平行硬墙之间的硬球流体的密度分布进行了计算。

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