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Simulation of wetting tendency of fluids with high density ratios using RK Lattice Boltzmann method

Sadeghi, M ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. Publisher: Asian Regional Conference on Soil Mechanics and Geotechnical Engineering , 2020
  3. Abstract:
  4. Several lattice Boltzmann models for multi-phase flow have been developed, but few of them are capable of modeling fluid flows with high density ratio in the order of 1000. Therefore, an advanced chromodynamics, Rothmann-Keller (RK) type model is employed in current study, which can handle liquid-gas density ratio in the order of 1000 and viscosity ratio in the order of 100. Other distinctive characteristics of the proposed model are high stability, and capability of setting parameters such as surface tension independently. In spite of these benefits, the original RK model fails to model wetting tendency of the fluids. As a result, it is impossible to correctly simulate two-fluid phase flow in porous media. To cope with this limitation, a wall-density approach is proposed here and validated against several case studies, including various contact angles near the solid phase. This methodology is implemented in our newly developed software in C++. The simulation results show that the new software can be effectively used to study wetting front shape at the pore scale near the solid phase for two immiscible fluid flows with fluid characteristics similar to water and air. Copyright © Soil Mechanics and Geotechnical Engineering, ARC 2019.All rights reserved
  5. Keywords:
  6. Contact angle ; Two-phase flow ; Wetting tendency ; Air ; C++ (programming language) ; Computer software ; Density of gases ; Geotechnical engineering ; Liquefied gases ; Porous materials ; Soil mechanics ; Wetting ; Density ratio ; Gas density ratios ; Immiscible fluid flows ; Lattice Boltzmann method ; Lattice boltzmann models ; Setting parameters ; Viscosity ratios ; Wetting fronts ; Flow of fluids
  7. Source: 16th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2019, 14 October 2019 through 18 October 2019 ; 2020
  8. URL: https://www.researchgate.net/publication/338335492_Simulation_of_wetting_tendency_of_fluids_with_high_density_ratios_using_RK_Lattice_Boltzmann_method