Journal
COMPUTERS & FLUIDS
Volume 168, Issue -, Pages 21-31Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.compfluid.2018.01.024
Keywords
Spontaneous imbibition; Capillary pressure; Two phase flow; Irregular channel; Lattice Boltzmann method
Funding
- National Key R & D Program of China [2016YFC0600705]
- National Major Project for Science and Technology of China [2017ZX05003-006]
- National Natural Science Foundation of China [U1562217, 51674251, 51727807]
- China Postdoctoral Science Foundation [2017M610877]
- National Science and Technology Major Project on Oil and Gas [2017ZX05013001]
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Accurate knowledge of spontaneous imbibition in irregular channels is fundamentally important for a better understanding of the transport in a porous media. During the spontaneous imbibition, the wetting fluid is driven by the capillary pressure and retarded by the viscous drag, both of which are highly influenced by the channel geometry. As a result, accurate simulation of the process in complex geometries becomes important. In this study, an improved fluid-solid interaction force in the two-phase pseudopotential lattice Boltzmann method is proposed for the accuracy and stability in simulating the spontaneous imbibition behavior. After validation the simulated results against the theoretical results in a 2D straight channel, the method is employed to simulate the spontaneous imbibition in irregular channel models, which include a sine-shape channel, a wedge-shape channel and bifurcated channels. The results quantitatively revealed the influence of tortuosity, channel shape on the imbibition behavior and the competing interfaces advancing behavior in bifurcated channels. (C) 2018 Elsevier Ltd. All rights reserved.
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