Browsing by Author "Benbrik, Abderrahmane"

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Etude Numérique de la Convection Naturelle dans une Cavité Carrée Inclinée en Présence d’un Corps Adiabatique
(2019) Bouanani, Mohammed; Benbrik, Abderrahmane; Cherifi, Mohammed; Denis, Lemonnier
Ce travail concerne la convection naturelle de l’air dans une cavité carrée inclinée, différentiellement chauffée et contenant un corps adiabatique centré. La convection naturelle est supposée être stationnaire, laminaire et bidimensionnelle. L'effet du rayonnement a été négligé. Les interactions dynamiques et thermiques ont été étudiées par la méthode des volumes finis utilisant la méthode des frontières immergées pour le traitement de corps adiabatique carrée. Pour valider la procédure numérique, deux cas de la littérature ont été simulés. La présente étude a été réalisée pour étudier l'effet d'une variété de nombres de Rayleigh de 103−106, d'un angle d'inclinaison de 0°−90° et de la taille du corps. L'analyse était basée sur la variation des lignes de courant, des isothermes et du nombre moyen de Nusselt. Les résultats montrent que le transfert de chaleur change sensiblement avec l’angle d’inclinaison pour un nombre de Rayleigh élevé, où il augmente, atteint un maximum et diminue. Une taille du corps plus élevée peut augmenter (diminuer) le transfert de chaleur tout dépend de l'angle d'inclinaison et du nombre de Rayleigh.
Evaluating Storage Potential and Integrity of Depleted Reservoirs for CO₂ Injection
(2025) Zakarya, Belimane; Youcefi, Mohamed Ryad; Benbrik, Abderrahmane; Hadjadj, Ahmed
As global industrial activity grows, carbon dioxide emissions increase, intensifying greenhouse effect and climate change and demanding solutions beyond renewable energy. This study investigates CO₂ sequestration in subsurface formations as a promising mitigation strategy to support international climate goals and reduce carbon levels. Using CMG 2021 software, different trapping mechanisms, including structural, residual, and solubility trapping, were evaluated in detail to determine their individual and combined contributions to overall storage capacity. Results show that integrating all three mechanisms increases storage potential by 30% compared with structural trapping alone. In addition, geological uncertainty was addressed through Monte Carlo simulations. For that, multiple realizations were generated by varying key reservoir parameters such as porosity, permeability and hysteresis-related parameter. This probabilistic approach allows for a more robust assessment of storage capacity variability and enhances prediction confidence. Furthermore, caprock integrity was evaluated using a two-way geomechanical coupling approach with the Bendis model. The findings indicate that injection-induced pressure reduces effective stresses within the caprock, which may promote tensile failures and create potential leakage pathways. This integrated analysis demonstrates that coupling numerical simulation and probabilistic tools support safer, more effective CO₂ storage, which offers a viable long-term solution for global climate change mitigation efforts.
Influence of the flow characteristics and mud physical properties on the Perfor-mance of a drilling turbine
(2021) Sahnoune, Khaled; Benbrik, Abderrahmane; Mansour, Ahmed S.; Moderres, Mourad
For turbo drilling machine operations, several types of drilling mud can be used. The major factors influencing the choice of drilling fluid are: Cost, ecological impact, and the technical performance of the machine. Water-based drilling mud is widely used in drilling turbines. It consists of freshwater with additives such as sand. These added materials will influence the properties of the mud, increasing the density, and changing the rheological properties. In this present work, the influence of the physical properties of the drilling mud (density, viscosity), and flow conditions (mass flow rate) on the performance and flow characteristics of a specified turbodrill Model is investigated. For this purpose, the computational fluid dynamics approach was used to simulate the flow inside one stage of the considered turbine. Various values of mass flow rate, density, and viscosity were tested. A very good agreement was found between the experimental measurements of the manufacturer and the current simulation results for the performance curves
Natural convection and volumetric radiation interactions in a concentric square annulus
(American Institute of Aeronautics and Astronautics, 2021) Bouanani, Mohammed; Benbrik, Abderrahmane; Lemonnier, Denis; Cherifi, Mohammed; Soualmi, Rabiaa
This paper focuses on a numerical investigation of steady two-dimensional natural convection and volumetric radiation interactions in a concentric annulus between two square isothermal cylinders. The annulus is filled with a gray absorbing–emitting and non-scattering medium. All the walls are assumed to be gray, diffuse, and opaque. The dynamic and thermal interactions are studied through a finite volume method combined with an immersed boundary technique to handle the square-shaped cylinder, whereas the discrete ordinates method is used to solve the radiative transfer equation. The present study is performed to investigate the effect of volumetric radiation on the flow for a variety of Rayleigh numbers 103 –106, three different optical thicknesses τ 0.2–1–5, a variety of Planck numbers 0.01–1, and three different aspect ratios A 0.2–0.4–0.6. The analysis is based on the dynamic and thermal fields in addition to the heat transfer rate. Results show that radiation affects significantly the flow and temperature distributions for a higher Rayleigh number Ra > 104, depending on the Planck number. The optical thickness and the aspect ratio has an important impact on the Nusselt number and percentage of radiation in heat transfer
A Numerical Study on the Effect of Radiation on Natural Convection in a Two-Square Duct Annuli Filled with a Semi-Transparent Fluid
(IJME, 2023) Bouanani, Mohammed; Benbrik, Abderrahmane; Soualmi, Rabiaa; Cherifi, Mohammed
In the present study, a numerical investigation of natural convection and volumetric radiation interactions has been analysed in an annulus between two isothermal concentric square ducts filled with a semi-transparent medium. Two-dimensional solution was obtained using a discrete ordinates method based on a combined finite volume-immersed boundary method. The fluid is assumed to be gray absorbing-emitting and non-scattering and all walls are gray, diffuse and opaque. The Rayleigh number is fixed to 106 , and a study of the effect of three optical thicknesses τ=0.2-1-5 is performed on the thermal and dynamic fields and consequently on the heat transfer rate has been examined. A pure natural convection case has been shown for a comparative study. It is found that the radiation has a large influence on the flow and surface averaged Nusselt number and especially for high Rayleigh numbers.
Radiation Effects on Boil-Off-Gas in an Above Ground LNG Storage Tank
(IEOM Society International, 2019) Cherifi, Mohammed; Benbrik, Abderrahmane
This study deals with evaporation phenomenon of liquefied natural gas (LNG) during its storage in an above ground tank. The LNG is stored at -162°C in heavily thermally insulated tanks. Due to imperfect insulation, heat leaks from the surrounded environment cause substantial losses by evaporation. The rate of generated vapors (Boil-off-Gas) depends essentially on the storage conditions (composition of the LNG, storage pressure, materials and dimensions of the tank, climatic conditions of surrounded environment, etc.). The objective of the present study is the evaluation of the radiation heat transfer from sidewall surface to LNG liquid surface under real storage conditions relevant to the Skikda’s liquefaction plant during in Algeria. Three different relative positions of the liquid surface corresponding to three LNG filling level in the tank were considered. The results show that the radiative heat transfer mode plays an important role in the evaporation phenomenon (more than 50% of the total heat leakages). The results we have obtained tend to confirm that the thermal radiation cannot be neglected
Volumetric gas radiation effects on double-diffusive mixed convection
(Publisher Logo Conference Proceedings, 2020) Benbrik, Abderrahmane; Cherifi, Mohammed; Sahnoune, Khaled; Laouar-Meftah, Siham; Moderres, Mourad
This work is devoted to studying the effect of volumetric gas radiation on mixed double-diffusive convection in a lid-driven square cavity. The vertical walls are maintained at different uniform temperatures and concentration gradients in cooperating flow. The horizontal walls are thermally insulated and impermeable to mass transfer. All the walls are assumed to be opaque, diffuse and gray. The top wall moves to the right side at a constant velocity. The cavity is filled with gray gas mixture considered as an absorbing, emitting and not scattering medium. The governing flow equations are solved by a finite volume method. The radiative transfer equation is modeled by discrete ordinates method. Results were presented in the form of isotherms, iso-concentrations, velocity profiles and heat and mass transfer for various values of Richardson number (Ri), Buoyancy ration (N) and optical thickness