我们可以假定，在空隙空间的一个数学点上液体质点的局部速度和浓度梯度之间无相关性。

We may assume that there is no correlation between the local velocity of a liquid particle at a mathematical point inside the void space and the concentration gradient.

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在该模拟中，本文通过对COD浓度的计算，又把质点跟踪法和改进后的欧拉·拉格朗日方法作了比较。

In this modeling, the Particle-tracing Method is again compared with the improved ELM by calculating the concentration of COD.

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