Publications Scientifiques
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Item Numerical Simulation of the Flow Around a Cylinder(Praise Worthy Prize, 2023) Irinislimane, Kenza; Hamane, DawoudThe work carried out consisted of the analysis of the flow around a cylinder using a numerical technique based on the Lattice Boltzmann Method (LBM), a relatively recent numerical calculation technique. Contrary to the traditional approaches of numerical simulation of the dynamics of the fluids (CFD) which consist in solving the equations of Navier-Stokes, the method used assimilates the fluid to fictitious particles. The equations are then solved for those particles which perform successive propagations and collisions in a mesh. This technique has been successfully applied for flows in porous media and for multiphase flows, in intensive computing. These simulations were carried out using a free code, Palabos, based on Linux. For a grip of the code and a validation of the method applied, the calculations were first applied to a cylinder placed in a two-dimensional then three-dimensional domain, for a laminar flow then for a turbulent flow represented by a large-scale simulation model (LES, Large Eddy Simulation).Item 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, MouradFor 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 curvesItem Comparison of turbulent forced convection between wall jet and channel flow over a heated obstacle(Inderscience, 2017) Kabache, Malika; Mataoui, Amina; Oztop, Hakan F.Item Heat transfer prediction of a jet impinging a cylindrical deadlock area(American Society of Mechanical Engineers (ASME), 2014) Halouane, Yacine; Mataoui, Amina; Iachachene, FaridaItem Numerical simulation of swirl and methane equivalence ratio effects on premixed turbulent flames and NOx apparitions(Regional Information Center for Science and Technology, 2016) Ouali, Sofiane; Bentebbiche, Halim; Belmrabet, ToufikThis paper presents a three dimensional numerical simulation of premixed methane-air low swirl stabilized flames. The computational domain has a simple geometry describing a LBS (low swirl burner) with 50mm of nozzle diameter. BANS Standard kappa - epsilon model to treat turbulence coupled with partially premixed combustion model are used. The purpose is to show the applicability limits and their capacities to predict governing flame parameters by varying swirl intensity and CH4 mass fraction at the inlet, which shows the optimum operating area of the burner in terms of generated energy and flame stability with a particular interest to thermal NOx apparitions. This work is compared and validated with experimental and LES numerical simulation works available in the literature. Results offered good similarity for all flame studied parameters. Swirl number was varied from 0.5 to 1.0 to ensure a wide operating range of the burner. From S=0.6, we observed the onset of recirculation zones, while for the inert flow the appearance of recirculation zones was observed for S=0.9. CH4 equivalence ratio was increased from 0.6 to 1.4. That showed apparition of zones with important NOx mass fraction due to the existence of zones with high temperature. Otherwise, the flow field wasn't disturbed in terms of recirculation zones apparitions who remained absent for all cases. Actual investigation works to find equilibrium between the maximum of generated temperature and the minimum of NOx emissions for swirled burners. Used models haven't showed applicability limits, results were clear and precise and offered a significantly gain in computing time and meansItem Heat transfer related to a self-sustained oscillating plane jet flowing inside a rectangular cavity(IEEE, 2014) Iachachene, Farida; Matoui, A.; Halouane, YacineItem Turbulent heat transfer for impinging jet flowing inside a cylindrical hot cavity(Serbian Society of Heat Transfer Engineers, 2015) Halouane, Yacine; Mataoui, Amina; Iachachene, FaridaConvective heat transfer from an isothermal hot cylindrical cavity due to a turbulent round jet impingement is investigated numerically. Three-dimensional turbulent flow is considered in this work. The Reynolds stress second order turbulence model with wall standard treatment is used for the turbulence predictions the problem parameters are the jet exit Reynolds number, ranging from 2·104 to 105 and the normalized impinging distance to the cavity bottom and the jet exit Lf, ranging from 4 to 35. The computed flow patterns and isotherms for various combinations of these parameters are analyzed in order to understand the effect of the cavity confinement on the heat transfer phenomena. The flow in the cavity is divided into three parts, the area of free jet, and the area of the jet interaction with the reverse flow and the semi-quiescent flow in the region of the cavity bottom. The distribution of the local and mean Nusselt numbers along the cavity walls for above combinations of the flow parameters are detailed. Results are compared against to corresponding cases for impinging jet on a plate for the case of the bottom wall. The analysis reveals that the average Nusselt number increases considerably with the jet exit Reynolds number. Finally, it was found that the average Nusselt number at the stagnation point could be correlated by a relationship in the form Nu = f(Lf, Re)Item Numerical investigations on heat transfer of self-sustained oscillation of a turbulent jet flow inside a cavity(American Society of Mechanical Engineers (ASME), 2015) Iachachene, Farida; Mataou, Amina; Halouane, YacineItem Numerical simulation of methane-air equivalence ratio effect on premixed low swirl stabilized flame(Springer, 2015) Ouali, Sofiane; Bentebbiche, Abdelhalim; Belmrabet, ToufikItem Fluid flow of a wall jet impinging a hot obstacle(Japan Society of Mechanical Engineers, 2015) Kabache, Malika; Mataoui, Amina