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Uniform Depth Channel Flow01:27

Uniform Depth Channel Flow

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Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
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Pore Size Distribution01:23

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In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
Adequate...
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Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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Permeability of Concrete01:25

Permeability of Concrete

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Permeability in the context of concrete refers to how easily liquids or gases can pass through the material. This quality is crucial for assessing the water-tightness and durability of concrete structures and their resistance to chemical attacks. Concrete permeability can be determined through comparative laboratory tests. These tests typically involve sealing a concrete specimen from the sides, applying water pressure to the top surface with pressure, and measuring the amount of water passing...
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Couette Flow01:22

Couette Flow

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Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
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Porosity in Cement Paste01:18

Porosity in Cement Paste

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The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
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Updated: Oct 30, 2025

A Microfluidic Platform to Study Bioclogging in Porous Media
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How Equivalent Are Equivalent Porous Media?

Ahmad Zareidarmiyan1,2,3, Francesco Parisio4, Roman Y Makhnenko5

  • 1Department of Mining and Metallurgical Engineering Amirkabir University of Technology-Tehran Polytechnic (AUT) Tehran Iran.

Geophysical Research Letters
|July 5, 2021
PubMed
Summary

Simplifying fractured rock models with equivalent porous media can lead to inaccurate pore pressure distribution and fracture stability predictions. Explicitly modeling fractures is often necessary for reliable geoenergy simulations and induced seismicity forecasting.

Keywords:
fracturesgeoenergiesinduced seismicitypermeabilitythermal effect

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Area of Science:

  • Geosciences
  • Computational modeling
  • Energy resources

Background:

  • Geoenergy and geoengineering commonly involve fluid flow in fractured rock formations.
  • Accurate modeling of these processes requires understanding the interplay between pore pressure and rock deformation (poromechanics).

Purpose of the Study:

  • To assess the validity of using equivalent porous media as a simplification for modeling fluid flow in fractured rocks.
  • To compare the accuracy of equivalent porous media models against explicit fracture models in geoenergy applications.

Main Methods:

  • Numerical simulations comparing two modeling approaches: explicit fracture representation versus equivalent porous media.
  • Calibration of both models to match injection and production well data.

Main Results:

  • Significant differences in pore pressure distribution were observed between the two modeling approaches.
  • Equivalent porous media models failed to accurately capture changes in fracture stability.

Conclusions:

  • Explicitly modeling fractures is crucial for accurate coupled thermohydromechanical simulations in certain geoenergy contexts.
  • Accurate fracture modeling can enhance the reliability of tools used for induced seismicity forecasting.