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Abstract:
Transport processes in the subsurface are strongly influenced by the heterogeneity of soil. Understanding the non-Fickian behavior of solute transport in such environments is critically important for the accurate prediction of the spatial and temporal distribution of mass. Traditional local continuum models (e.g., classical differential equation-based approaches) encounter inherent limitations when dealing with strong heterogeneities, fractures, and other discontinuous structures due to their reliance on spatial derivative continuity assumptions. This study develops a peridynamic non-Fickian transport model to consider the non-Fickian and non-local effects simultaneously. The model is formulated in the framework of bond-based peridynamic (PD) by introducing the concept of dual phase lag (DPL) effects, including flux lag τJ quantifying inertial collision delays from pore structure irregularities and storage lag τC reflecting interfacial adsorption–desorption effects, to provide an alternative numerical framework for addressing these complexities. The developed dual-phase lag peridynamic (DPL-PD) framework is validated against the analytical solution. The effects of phase lag and heterogeneity were discussed. A series of case studies, including solute transport in layered soil, heterogeneous soil, and porous media with discontinuity, demonstrate the capacity of DPL-PD model to capture the non-Fickian and non-local transport of solute in heterogeneous and discontinuous porous media. Furthermore, these cases quantitatively assess the influence of permeable and impermeable inclusions, as well as fractures, on solute transport. The results show that the developed dual-phase lag peridynamic framework can offer an alternative to classical local formulations for investigating non-Fickian and non-local transport in media with physically realistic microstructures. © 2025
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Computers and Geotechnics
ISSN: 0266-352X
Year: 2025
Volume: 187
5 . 3 0 0
JCR@2023
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 4
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