Pore-scale simulation of dispersion
Pore-scale simulation of dispersion
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DOI：
10.1063/1.870452
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发表时间：
2000-08-01
影响因子：
4.6
通讯作者：
Davis, HT
中科院分区：
文献类型：
--
作者：
Maier, RS;Kroll, DM;Davis, HT
示踪剂的分散已被模拟在三维模型的规则和随机球填料的范围内的Peclet数。采用随机行走粒子跟踪（PT）方法模拟了用格子玻尔兹曼（LB）方法计算的孔隙流场中示踪剂的运动。模拟结果说明了色散的时间演化，他们证实了一些理论和经验的结果与Peclet数的渐近纵向和横向色散的标度。与核磁共振（NMR）光谱实验的比较表明，协议的瞬态，以及渐近，分散率。这些结果支持两个NMR的研究结果，即纵向色散率显着低于在早期的实验文献中报道的，以及渐近速率的事实，观察到在相对较短的时间内，采用均匀的初始分布的示踪剂，如NMR技术。(C)2000年美国物理学会。[S1070-6631（00）02308-4]。
Tracer dispersion has been simulated in three-dimensional models of regular and random sphere packings for a range of Peclet numbers. A random-walk particle-tracking (PT) method was used to simulate tracer movement within pore-scale flow fields computed with the lattice-Boltzmann (LB) method. The simulation results illustrate the time evolution of dispersion, and they corroborate a number of theoretical and empirical results for the scaling of asymptotic longitudinal and transverse dispersion with Peclet number. Comparisons with nuclear magnetic resonance (NMR) spectroscopy experiments show agreement on transient, as well as asymptotic, dispersion rates. These results support both NMR findings that longitudinal dispersion rates are significantly lower than reported in earlier experimental literature, as well as the fact that asymptotic rates are observed in relatively short times by techniques that employ a uniform initial distribution of tracers, like NMR. (C) 2000 American Institute of Physics. [S1070-6631(00)02308-4].