基于几何重建的气液两相流孔隙尺度模拟

Pore Scale Modeling of Liquid-Gas Two-Phase Flow Based on Geometrical Reconstruction

本文基于二维micro CT扫描图像进行数值重构得到三维多孔介质几何模型,采用Shan-Chen多相格子Boltzmann方法(LBM)建立适用不规则几何边界区域内气液两相流动数值模型,在此基础上对复杂多孔介质内的两相流动过程进行孔隙尺度模拟。结果表明,气-液两相流动受限于多孔介质的复杂孔隙结构,气液表面张力、壁面润湿特性以及进出口压差对两相流动特性将产生明显影响。

In this paper,the three dimensional porous geometrical model was reconstructed with two dimensional scan images from micro CT.The Shan-Chen type multiphase lattice Boltzmann Method was adopted to establish the liquid-gas two-phase flow model,which is suitable for the irregular geometrical boundary conditions.The two-phase flow simulations in a 3D reconstructed porous domain were performed and the detailed characteristic of the fluid flow in porous media was described.The results show that the hquid-gas two-phase flow is confined in the complex pore structure in porous media.The effects of porous structure wettability,surface tension and pressure gradient were discussed based on the numerical predictions.