Anomalous Dispersion in Pore-Scale Simulations of Two-Phase Flow

Anomalous Dispersion in Pore-Scale Simulations of Two-Phase Flow
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两相流孔隙尺度模拟中的反常色散

DOI:
10.1007/s11242-018-1155-6
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发表时间:
2019
影响因子:
2.7
通讯作者:
Bolster, Diogo
Bolster, Diogo
中科院分区:
工程技术3区
文献类型:
--
作者:
Triadis, Dimetre;Jiang, Fei;Bolster, Diogo

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我们研究了通过随机的人工多孔区域的稳态两相流中的反常色散。通过两相格子Boltzmann排水模拟,获得了捕获的润湿相流体的自然分布。为了避免虚假的速度,精确的孔隙间速度场推导出通过额外的单相格子玻尔兹曼模拟结合滑移边界条件施加在各种接口。随后通过随机游走粒子跟踪研究了在不同时间尺度下的活性分散体的性质。对于我们的系统,结果表明持续的异常色散强烈依赖于假设的分子扩散率和示踪粒子的初始位置。施加滑移与无滑移边界条件对流体-流体界面的结果没有明显的差异,表明观察到的异常分散主要是由于复杂的流动网络引起的被困流体相。
We investigate anomalous dispersion in steady-state two-phase flow though a random, artificial porous domain. A natural distribution of trapped wetting-phase fluid was obtained via two-phase lattice Boltzmann drainage simulations. To avoid spurious velocities, accurate inter-pore velocity fields were derived via additional one-phase lattice Boltzmann simulations incorporating slip boundary conditions imposed at various interfaces. The nature of the active dispersion at various timescales was subsequently studied via random walk particle tracking. For our system, results show persistent anomalous dispersion that depends strongly on the assumed molecular diffusivity and the initial positions of tracer particles. Imposing slip versus no-slip boundary conditions on fluid–fluid interfaces made no observable difference to results, indicating that observed anomalous dispersion resulted primarily from the complex flow network induced by the trapped fluid phase.
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