多孔介质内颗粒迁移和沉积的孔隙尺度模拟——基于LBM-DEM-IMBM耦合模型
Journal: Building Development DOI: 10.12238/bd.v6i6.3995
Abstract
在地下水源热泵运行过程中,回灌过程会导致土壤渗透性的损害,导致系统失效。采用耦合格子Boltzmann方法、离散单元法和浸没移动边界法(LBM-DEM-IMB)研究了颗粒在多孔介质中的迁移。采用DKT现象来验证了程序的准确性。分析了浓度、入口流速和pH对多孔介质堵塞过程的耦合影响。结果表明,pH的变化主要影响排斥屏障,排斥势垒的降低促进了颗粒的沉积,尤其当入口流速较低时。对于中性悬浮液,存在临界速度具备最高的沉积率。当入口流速较低,浓度增加促进颗粒沉积。当入口流速较高时,随着浓度增长,颗粒滞留率先降低后增长。入口流速的增加有助于保持多孔介质的渗透率。
Keywords
流-固耦合；格子Boltzmann方法；离散单元法；浸没移动边界法
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