Physical and CFD Simulated Models to Analyze the Contaminant Transport through Porous Media under Hydraulic Structures

Muhsun, Sadiq S.; Saleh, May Samir; Qassim, Ali R.

doi:10.1007/s12205-020-1767-6

Cited by 3 publications

(2 citation statements)

References 31 publications

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“…This condition draws considerable attention from researchers from multiple disciplines [40], and more accurate estimations using numerical models are significant. Similarly, it also applies to other density-dependent studies like solute or contaminant transport in porous media [41]. With more focus on the distribution of fluid density, the Brinkman Equation is capable of capturing the details.…”

Section: Discussionmentioning

confidence: 99%

Comparing Darcy’s Law and the Brinkman Equation for Numerical Simulations of Saltwater Intrusion

Yao,

Zhang

2023

Sustainability

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Saltwater intrusion into coastal aquifers presents a significant global challenge to fresh groundwater resources. Numerical modelling represents a valuable tool to study this phenomenon. Darcy’s Law is widely applied to groundwater studies and is extended into the Brinkman Equation to account for kinetic dissipations due to viscous shear. However, their comparative performance and accuracy in density-driven flows remain unclear. To determine the circumstances where the Brinkman Equation is required, numerical simulations with both models were implemented in hypothetical coastal aquifer scenarios. The results revealed that the largest discrepancies between the two models occur inside the dispersion zone during the break-through period, with concentration differences of up to 2.5%. The mixing of freshwater and saltwater induces rapid density and velocity variations. Brinkman’s viscous term moderates the rate of change and decreases the intrusion length by up to 6.1 m in a 180 m intrusion case. Furthermore, higher permeability and a lower recharge rate both strengthen the viscous effects in most sandy coastal aquifers. The Brinkman Equation excels at capturing intricate flow patterns with large variations. Therefore, it is necessary to be employed for studies on freshwater–saltwater interfaces and other similar conditions including groundwater–surface water interfaces, non-isothermal flows, and complex geological conditions.

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Section: Discussionmentioning

confidence: 99%

Comparing Darcy’s Law and the Brinkman Equation for Numerical Simulations of Saltwater Intrusion

Yao,

Zhang

2023

Sustainability

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“…CFD technique is a proven powerful and cost effective tool relevant in the study of complex flow patterns. It possesses the capability of giving detailed information in physical models that aid prediction of airflow behavior in real-life scenarios [3][4][5]. Due to its versatility, the application of CFD has gained wide range of use in many engineering fields such as; Biological Engineering [6], Environmental Engineering [7], and has been established as relevant tool in the field of Medicine [8].…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics Modeling in Respiratory Airways Obstruction: <i>Current Applications and Prospects</i>

Ayodele¹,

Oluwatosin²,

Taiwo³

et al. 2021

IJBSE

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Breathing conditions pertaining to nasal obstruction, obstructive sleep apnea, and airflow resistance in the human lower airways have been investigated extensively by researchers over the years. Due to the availability of advanced computer numerical models, such as computational fluid dynamics (CFD), researchers have made progressive studies of airflow characteristic, especially the effects of airflow pressure, velocity and wall shear stress in human obstructive airways. Studies utilizing CFD have enhanced clinical understanding of the physiology and pathophysiology of the respiratory system through the concept of three-dimensional models that facilitate airflow simulation. The main objective of this article is to review recent CFD literature on nasal airflow and lower airway obstruction. The review covers the role of segmentation threshold in the outcome of airflow simulation in the nasal cavity, and results of fluid structure interaction (FSI) and computational fluid dynamics in nasal obstruction and airway collapse in obstructive sleep apnea were also correlated. For models of the lower airways, we evaluated the effect of extra-thoracic airway (ETA) on downstream airflow during simulation against the popular Weibel's model. In the concluding section, we discussed the advantages, limitations, and prospects (precisely with deep machine learning) of computational fluid dynamics in the clinical assessment and investigation of respiratory diseases.

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Unsteady state contaminants transport in sandy mediums using CFD model

Hussein

Muhsun

Al‐Sharify

et al. 2021

IOP Conf. Ser.: Earth Environ. Sci.

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This study was conducted to provide a CFD simulation model to simulate the transfer of pollutants through sandy soils. A physical model and simulation model were designed and implemented with the help of CFD programs using COMSOL 5.4 software to study the process of transporting pollutants within the porous medium. To study the pollutant transmission in the porous media, a sand size of less than 0.36 mm diameters was used as porous media. For an analysis of the problem, several groups of factors were considered and assumed. The first group concerned with the physical properties of the media likes coefficient of adoption Kd. The second group represented the hydraulic factor of flow likes velocity. The results of the physical and CFD models showed there is a clear effect of soil physical properties due to the coefficient of adsorption Kd action. The velocity has a significant effect on the concentrations of pollutants and the time of transmission where the lower velocities produce lower concentrations and delayed transport of pollutants in the soil. The CFD simulated model showed that the change in the Kd-value has a significant impact on the results. The study also showed a good agreement between the results of the laboratory work provided by the physical model and that of the CFD model depending on several statistical indexes. This indicates that the CFD models could be considered as an efficient tool to simulate the complex problems of contaminates transport through a porous medium.

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Physical and CFD Simulated Models to Analyze the Contaminant Transport through Porous Media under Hydraulic Structures

Cited by 3 publications

References 31 publications

Comparing Darcy’s Law and the Brinkman Equation for Numerical Simulations of Saltwater Intrusion

Comparing Darcy’s Law and the Brinkman Equation for Numerical Simulations of Saltwater Intrusion

Computational Fluid Dynamics Modeling in Respiratory Airways Obstruction: <i>Current Applications and Prospects</i>

Unsteady state contaminants transport in sandy mediums using CFD model

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Physical and CFD Simulated Models to Analyze the Contaminant Transport through Porous Media under Hydraulic Structures

Cited by 3 publications

References 31 publications

Comparing Darcy’s Law and the Brinkman Equation for Numerical Simulations of Saltwater Intrusion

Comparing Darcy’s Law and the Brinkman Equation for Numerical Simulations of Saltwater Intrusion

Computational Fluid Dynamics Modeling in Respiratory Airways Obstruction: &lt;i&gt;Current Applications and Prospects&lt;/i&gt;

Unsteady state contaminants transport in sandy mediums using CFD model

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Computational Fluid Dynamics Modeling in Respiratory Airways Obstruction: <i>Current Applications and Prospects</i>