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Abstract:
A novel bond-based nonlocal fluid transport model is introduced to tackle fluid flow in saturated porous media characterized by anisotropic and heterogeneous permeability. This model is built upon the bond-based framework and utilizes a type of Gaussian kernel function with truncation, incorporating the coefficient matrix within the covariance matrix. It is crucial to highlight that the permeability exerts a profound influence on the size and shape of the influence region after truncation. As a result, in cases of strong heterogeneity, the calculation area can become excessively large, posing challenges to effective computation. To confront this difficulty, we introduce a reconstructed bond-based nonlocal fluid transport model that dynamically adjusts based on permeability, allowing it to accommodate a wider range of scenarios. Meanwhile, we have proved that the proposed operator convergence to the local fluid transport operator in weak form. Moreover, a fully implicit algorithm, integrated with the Newton-Raphson method, is utilized to tackle the complex nonlinear issues arising in saturated porous media characterized by anisotropic and heterogeneous permeability. The novel bond-based model surpasses traditional bond-based model by enhancing fluid transport simulation in saturated porous media with strongly heterogeneous permeability. Additionally, unlike non-ordinary state-based model, the proposed model eliminates the need for complex penalty methods to address zero-energy modes, significantly reducing computational demands and time, as demonstrated by further validation. The numerical example exhibits strong agreement with COMSOL Multiphysics, confirming the accuracy of the model and its capability to effectively capture pressure discontinuities along material interfaces and crack surfaces in saturated porous media characterized by anisotropic and strong heterogeneous permeability. © 2025 Author(s).
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Physics of Fluids
ISSN: 1070-6631
Year: 2025
Issue: 4
Volume: 37
4 . 1 0 0
JCR@2023
CAS Journal Grade:2
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 2
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