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<p>In seasonally frozen regions, ice-water phase transitions during spring snowmelt critically reshape the thermo-hydraulic properties of porous media. However, the underlying pore-scale mechanisms remain poorly quantified, particularly the dynamic variations in thermo-hydraulic transport parameters during melting processes. In this study, a pore-scale numerical model for ice-water phase transitions was developed using the Lattice Boltzmann Method (LBM) with a double-distribution function approach, and its accuracy was rigorously validated. The model enables in-depth investigation of the complex microscopic mechanisms governing coupled heat and fluid flow in porous media under phase change conditions. The results demonstrate that the heterogeneity of porous media structures and thermal boundary conditions jointly govern ice melting dynamics, leading to spatially heterogeneous temperature and phase distributions. Quantitative and qualitative analysis shows that the decrease of porosity significantly speeds up the ice melting rate under the same conditions.</p>

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Pore-Scale Lattice Boltzmann Simulation of Ice-Water Melting and Its Impact on Hydrothermal Transport in Porous Media

  • 期刊论文

  • 发表日期：

    2025年10月23日

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  • Xiaokun Yi,
  • Weihong Dong,
  • Yuyu Wan,
  • Xiaosi Su,
  • Hang Lyu,
  • Xiaofang Shen,
  • Tiejun Song,
  • Jia Niu

摘要

In seasonally frozen regions, ice-water phase transitions during spring snowmelt critically reshape the thermo-hydraulic properties of porous media. However, the underlying pore-scale mechanisms remain poorly quantified, particularly the dynamic variations in thermo-hydraulic transport parameters during melting processes. In this study, a pore-scale numerical model for ice-water phase transitions was developed using the Lattice Boltzmann Method (LBM) with a double-distribution function approach, and its accuracy was rigorously validated. The model enables in-depth investigation of the complex microscopic mechanisms governing coupled heat and fluid flow in porous media under phase change conditions. The results demonstrate that the heterogeneity of porous media structures and thermal boundary conditions jointly govern ice melting dynamics, leading to spatially heterogeneous temperature and phase distributions. Quantitative and qualitative analysis shows that the decrease of porosity significantly speeds up the ice melting rate under the same conditions.