2023 Fiscal Year Final Research Report

Mechanism of two phase thermo-fluid behavior in porous media and its high accuracy numerical analysis based on multi-scale effect

Research Project

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Project/Area Number	19KK0109
Research Category	Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))
Allocation Type	Multi-year Fund
Review Section	Medium-sized Section 22:Civil engineering and related fields
Research Institution	Kumamoto University
Principal Investigator	Mukunoki Toshifumi 熊本大学, 大学院先端科学研究部(工), 教授 (30423651)
Co-Investigator(Kenkyū-buntansha)	大谷順熊本大学, 大学院先端科学研究部(工), 教授 (30203821) 才ノ木敦士熊本大学, 大学院先端科学研究部(工), 准教授 (70802049)
Project Period (FY)	2019-10-07 – 2024-03-31
Keywords	油汚染地盤 / 格子ボルツマン法 / 移流拡散 / 粘性 / X線CT画像解析 / 多孔質体
Outline of Final Research Achievements	In this study, the liquid-liquid two-phase flow lattice Boltzmann method, coupled with the Navier-Stokes and advection-diffusion equations, was used to analyze the flow of highly viscous fluid in a porous medium. An experimental apparatus for injecting highly viscous fluid for X-ray CT analysis was also developed. The findings are as follows: The flow simulation based on the liquid-liquid two-phase flow lattice Boltzmann method was used to simulate the recovery method of injecting hot water, and the behavior of water and oil in the pore fluid was qualitatively evaluated. In the latter coupled analysis of the Navier-Stokes equation with diffusion and the advection-diffusion equation, the diffusion of highly viscous fluid in a porous medium occurs where fluids with different viscosities and densities come into contact. The slow diffusion behavior was obtained from both X-ray CT analysis and numerical analysis.
Free Research Field	環境地盤工学
Academic Significance and Societal Importance of the Research Achievements	本研究は，オイルサンドのからの重質油を効率的に回収するという実問題を多少に，多孔質材料中の高粘性流体の流動機構を解明することを学術的課題とした。LBMによる流動解析は，二流体間の拡散現象を考慮できないが，間隙中に重質油がトラップされる様子が再現できた．一方，連成解析の成果は，従来の重質油回収方法に新たに提案するVAPEX法を想定した解析であり，二流体間の拡散現象とそれに伴う粘性の変化が，多孔質体内で流動挙動を加速する現象が再現できた．これらの成果は，オイルサンドからの重質油回収のための新しい技術開発及び境界条件の提案につながることが期待される．