Pore-scale computational analyses of non-Darcy flow through highly porous structures with various degrees of geometrical complexity

Moghimi, Hamid; Siavashi, Majid; Nezhad, Mohaddeseh Mousavi; Guadagnini, Alberto

doi:10.1016/j.seta.2022.102048

Cited by 11 publications

(9 citation statements)

References 49 publications

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“…To get closer to the real structures of the MFMs, numerical simulations are conducted to reconstruct their microporous structures. Pore-scale numerical simulation is a crucial way to reveal the transport properties of porous media [44][45][46][47] . For two-directional isotropic disordered MFMs, Volkov and Zhigilei [32] proposed a numerical framework for calculating the ETC.…”

Section: Symbols Kmentioning

confidence: 99%

Influence of Solder Condition on Effective Thermal Conductivity of Two-Directional Random Fibres: Pore-Scale Simulation

Tian¹,

Zhang²,

Yang³

et al. 2022

SSRN Journal

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Section: Symbols Kmentioning

confidence: 99%

Influence of Solder Condition on Effective Thermal Conductivity of Two-Directional Random Fibres: Pore-Scale Simulation

Tian¹,

Zhang²,

Yang³

et al. 2022

SSRN Journal

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“…These studies usually rest on high‐resolution three‐dimensional pore structures provided by X‐ray CT imaging (see, e.g., Mostaghimi et al., 2013; Van Offenwert et al., 2021 and references therein, amongst others) within which relevant processes can be simulated numerically. Typical pore‐scale modeling studies are based on finite volume approaches (FVM; e.g., Moghimi et al., 2022; Mostaghimi et al., 2013) and/or the Lattice‐Boltzmann method (LBM; e.g., Poureslami et al., 2021; Vasheghani Farahani et al., 2020). Results depict slower and more complex transport features across porous media with an increased degree of pore structure heterogeneity.…”

Section: Introductionmentioning

confidence: 99%

Multi‐Scale Analysis of Dispersive Scalar Transport Across Porous Media Under Globally Nonlinear Flow Conditions

Moghimi,

Mousavi Nezhad,

Guadagnini

2023

Water Resources Research

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We focus on nonlinear flow regime scenarios observed at the global scale of a porous medium and explore the impact of such nonlinearities on key features of dispersive scalar transport observed across three‐dimensional porous systems characterized by various degrees of pore space complexity. Flow and transport processes are analyzed at pore‐scale and larger scales in well‐documented digital Beadpack and Bentheimer sandstone samples. Our simulations comprise linear (Darcy) and nonlinear (Forchheimer) flow regimes and consider a broad interval of values of Péclet number (ranging from 1×10‐2 to 5×104). Sample probability density functions of pore‐scale velocities and concentrations of the migrating scalar are analyzed and related to flow conditions and degree of complexity of the pore space. Estimated values of dispersion associated with section‐averaged breakthrough curves display a power‐law scaling on the Péclet number. The scaling exponent depends on the relative importance of pore‐scale diffusion and advection. We find that the Forchheimer flow regime is characterized by enhanced mixing of the scalar field. This leads to enhanced dispersion as compared against a Darcy regime.This article is protected by copyright. All rights reserved.

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“…Porous systems are found in various scientific fields and engineering applications such as oil and gas recovery, geological storage of CO2 and H2, geothermal energy storage, groundwater remediation, chromatography, exploitation of unconventional reservoirs, and fuel cells [1][2][3][4][5] . Such a wide array of applications necessitates a profound understanding of heat and mass transfer phenomena occurring in pore space, which are associated with single or multiphase fluid flow.…”

Section: Introductionmentioning

confidence: 99%

“…Thanks to recent advances in high-performance computing, computational fluid dynamics (CFD) approaches have been successfully employed for numerical simulation of transport phenomena in porous media 29 . The continuum-scale CFD approaches, such as finite difference method (FDM), finite element method (FEM), and finite volume method (FVM), directly solve the governing equations to characterise the pore-scale transport and obtain the macroscopic transport properties such as absolute/relative permeability 5,11,32,33 . However, the application of these methods is fairly challenging in complex geometries, particularly at high 𝑅𝑒, due to their inherent high computational costs and intractability in capturing the fluid-solid interactions 34 .…”

Section: Introductionmentioning

confidence: 99%

On the effect of flow regime and pore structure on the flow signatures in porous media

Farahani

Nezhad

2022

Physics of Fluids

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In this study, lattice Boltzmann method (LBM) is utilised for three-dimensional simulation of fluid flow through two porous structures, consisting of grains with the same diameter: (i) a homogeneous porous domain, in which the grains are placed with a simple cubic packing configuration, and (ii) a randomly-packed porous domain. An ultra-fine mesh size is considered to perform the simulations in three orders of magnitude of Reynolds number (), covering laminar to turbulent flow regimes, and capture different flow signatures. Pore velocity fields are derived, and their sample probability density functions (PDF) are analyzed versus time to investigate the dynamics of the flow. The analysis of the PDFs clearly shows that stagnant zones play a significant role in the formation of the pore flow fields, manifested by multimodal PDFs, and the distribution of the velocities in porous media at various cannot be characterized by a single PDF model regardless of the pore structure. While the velocities at the stagnant regions and in the vicinity of the solid boundaries are primarily affected by the viscous forces and exhibit a power-law PDF at different , the velocities in the main (preferential) flow pathways away from the boundaries are shown to be influenced by the inertial forces, hence having an exponential PDF when is low. At high, however, depending on the tortuosity of the porous structure, the velocities may exhibit an exponential or even Laplace PDF.

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Pore-scale computational analyses of non-Darcy flow through highly porous structures with various degrees of geometrical complexity

Cited by 11 publications

References 49 publications

Influence of Solder Condition on Effective Thermal Conductivity of Two-Directional Random Fibres: Pore-Scale Simulation

Influence of Solder Condition on Effective Thermal Conductivity of Two-Directional Random Fibres: Pore-Scale Simulation

Multi‐Scale Analysis of Dispersive Scalar Transport Across Porous Media Under Globally Nonlinear Flow Conditions

On the effect of flow regime and pore structure on the flow signatures in porous media

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