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    张嘉, 王明玉, 张雷. 数值模拟中非均质介质纵向弥散度[J]. 华东理工大学学报(自然科学版), 2010, (6): 796-800.
    引用本文: 张嘉, 王明玉, 张雷. 数值模拟中非均质介质纵向弥散度[J]. 华东理工大学学报(自然科学版), 2010, (6): 796-800.
    ZHANG Jia, WANG Ming-yu, ZHANG Lei. Suitability of Numerical Simulation for Two Computations of Longitudinal Dispersivity in Heterogeneous Media[J]. Journal of East China University of Science and Technology, 2010, (6): 796-800.
    Citation: ZHANG Jia, WANG Ming-yu, ZHANG Lei. Suitability of Numerical Simulation for Two Computations of Longitudinal Dispersivity in Heterogeneous Media[J]. Journal of East China University of Science and Technology, 2010, (6): 796-800.

    数值模拟中非均质介质纵向弥散度

    Suitability of Numerical Simulation for Two Computations of Longitudinal Dispersivity in Heterogeneous Media

    • 摘要: 介绍了地下水溶质迁移数值模拟中两种常用的纵向弥散度模拟计算方法——弥散面积法和线性图解法,重点通过建立代表性非均质模型并模拟运行,分析了两种方法计算纵向弥散度的准确性,比较了在不同的水力梯度、点源浓度、网格抛分以及非均质性等情况下两种方法的适用性。研究结果表明两种方法均可以较准确地获得非均质介质因流速空间分布差异所产生的一定量级的纵向弥散度;两种方法对不同点源浓度和非均质性等情况都比较适宜,而在给定的非均质渗流场中,对于不同水力梯度与网格抛分等情况,线性法比较适宜。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。

       

      Abstract: By establishing representative heterogeneous model and simulating, this paper analyzed the exactitude and suitability of two commonly used methods to compute longitudinal dispersivity in the numerical simulation for different conditions, including the dispersive-area (DA) method and the linear-graphic(LG)method. The results indicated that in the research both methods could get good values of longitudinal dispersivity caused by heterogeneity and could be suitable for different contaminated source concentrations and heterogeneity in the numerical simulation. But for different hydraulic gradients and grid sizes in the numerical simulation, LG method was more suitable. The changes of longitudinal dispersivity with the grid sizes were mainly caused by numerical dispersion.

       

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