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土壤水分布的孔隙尺度格子玻尔兹曼模拟研究

胡五龙 刘国峰 晏石林 范严伟

胡五龙, 刘国峰, 晏石林, 范严伟. 土壤水分布的孔隙尺度格子玻尔兹曼模拟研究[J]. 力学学报, 2021, 53(2): 568-579. doi: 10.6052/0459-1879-20-198
引用本文: 胡五龙, 刘国峰, 晏石林, 范严伟. 土壤水分布的孔隙尺度格子玻尔兹曼模拟研究[J]. 力学学报, 2021, 53(2): 568-579. doi: 10.6052/0459-1879-20-198
Hu Wulong, Liu Guofeng, Yan Shilin, Fan Yanwei. PORE-SCALE LATTICE BOLTZMANN MODELING OF SOIL WATER DISTRIBUTION[J]. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(2): 568-579. doi: 10.6052/0459-1879-20-198
Citation: Hu Wulong, Liu Guofeng, Yan Shilin, Fan Yanwei. PORE-SCALE LATTICE BOLTZMANN MODELING OF SOIL WATER DISTRIBUTION[J]. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(2): 568-579. doi: 10.6052/0459-1879-20-198

土壤水分布的孔隙尺度格子玻尔兹曼模拟研究

doi: 10.6052/0459-1879-20-198
基金项目: 1) 国家自然科学基金(11602180);武汉理工大学研究生优秀学位论文培育项目(2018-YS-079);中央高校基本科研业务费专项资金资助(2020IA-0-01)
详细信息
    作者简介:

    2) 胡五龙, 副教授, 主要研究方向: 环境流体力学. E-mail: wulong.hu@whut.edu.cn

    通讯作者:

    胡五龙

  • 中图分类号: O359+.2

PORE-SCALE LATTICE BOLTZMANN MODELING OF SOIL WATER DISTRIBUTION

  • 摘要: 土壤水控制着陆地生态系统几乎所有的物理和生物化学过程,准确描述土壤中水的分布与运动状态对人类发展和生态环境保护均有重要意义.土壤水分布不仅与孔隙结构有关, 而且受土壤固相表面润湿性的影响.一般对土壤水分布都是从宏观尺度进行描述,但土壤中的物理及生化过程都发生在孔隙中, 从孔隙尺度分析土壤水的分布规律,有助于更准确地理解土壤中的各种宏观现象.本文通过X射线扫描成像技术获取两个土样的三维孔隙结构,并采用改进的Shan-Chen格子玻尔兹曼模型,模拟了在不同润湿性条件下两个土样中孔隙水分布,分析了接触角对孔隙水分布的影响, 结果表明:接触角较大时,孔隙直径对液态水和水蒸气分布影响较小, 随着接触角减小,孔隙直径对液态水和水蒸气的分布影响增大;接触角对液、气、固之间的界面面积以及流体输运通道直径也有较大影响,液体输运通道直径随接触角减小而变小, 气体输运通道直径则随接触角的减小先增大,后减小; 土壤中液态水密度随接触角变化很小,但水蒸气密度随接触角减小而显著降低; 接触角较大时,饱和度对水蒸气密度无明显影响, 接触角较小时,饱和度的增大会显著提高水蒸气的密度.

     

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  • 收稿日期:  2020-06-13
  • 刊出日期:  2021-02-10

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