网格抛分使模拟计算的纵向弥散度变化的主要原因是数值弥散。
The changes of longitudinal dispersivity with the grid sizes were mainly caused by numerical dispersion.
结果表明该法能消除大部分的数值弥散，而且又不增加解的振荡性。
It is showed that the method can dispel most numerical dispersion and the vibration of solution doesn't increase.
流线模型不存在数值弥散和不稳定性，比传统的数值模拟速度快，允许节点多。
The streamline model overcomes the numerical dispersion and instability, is faster than the conventional numerical simulation and allows for more nodes.
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