这一不透气的壳层(或边界层)会阻滞水分自由扩散，这种情形称为表面硬化。

This impervious layer or boundary will retard the free diffusion of moisture. This condition is referred to as case hardening.

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明渠水流是对具有自由表面的水流在有限尺度的固体边界约束下流动现象的一种概化。

Open channel flow is a sort of generalize for water flow phenomenon, which water stream with free surface be leashed by solid boundary with finity scale.

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提出了一种适用于具有复杂海底边界的自由表面流动模拟算法？基于非结构化四边形网格的VOF法。

A novel VOF method based on unstructured quadrilateral mesh for free surface flows with complex seabed boundaries is presented.

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