These interactions are short-range and difficult to be handled in mathematics.
这种相互作用在数学上是极难处理的。
Two new models are compared with the simple repulsive force model, and the dominant role of long-range hydrodynamic force and short-range interactions are established in different cases.
通过三种不同碰撞模型的对比，研究了水动力和短程力在粒子浓度不同时的主导作用。
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