Author: "Meftah S" / Publisher: edp sciences - Searchworks@Jio Institute Digital Library Search Results

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Start Over Author "Meftah S" Publisher edp sciences

Author: Meftah, S. M. A., Belhenniche, M., Fouatih, O. Madani, and Imine, B.
Subjects: *FLOW separation, *FLUID flow, *BOUNDARY layer (Aerodynamics), *FLUID dynamics, *AERODYNAMICS
Abstract: The main subject of this work is the numerical study control of flow separation on a NACA 23015 airfoil by using wing cuff. This last is a leading edge modification done to the wing. The modification consists of a slight extension of the chord on the outboard section of the wings. Different numerical cases are considered for the baseline and modified airfoil NACA 23015 according at different angle of incidence. The turbulence is modeled by two equations k-epsilon model. The results of this numerical investigation showed several benefits of the wing cuff compared with a conventional airfoil and an agreement is observed between the experimental data and the present study. The most intriguing result of this research is the capability for wing cuff to perform short take-offs and landings. [ABSTRACT FROM AUTHOR]
Published: 2014
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Author: Belferhat, S., Meftah, S. M. A., Yahiaoui, T., and Imine, B.
Subjects: *FLUID dynamics, *AIRPLANE wings, *AERODYNAMICS research, *ANGLE of attack (Aerodynamics), *SPEED measurements
Abstract: In the present study, an experimental study is presented for a flow around an isolated wing equipped by a winglet and profiled with Naca 0012. Several cases of winglets were tested according to the angle β: 0°, 55°, 65° and 75°. For all these cases at a velocity of 20, 30 and 40 meters per second, wind tunnel tests are performed and compared for different angles of incidence. It is observed that the aerodynamic performance of the winglet with β = 55° differ favorably for positive angle of incidence compared for other cases. [ABSTRACT FROM AUTHOR]
Published: 2013
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Author: Yeghnem R., Boulefrakh L., Meftah S.A., Tounsi A., and Adda Bedia E.A.
Subjects: Engineering (General). Civil engineering (General), TA1-2040
Abstract: The present paper deals with the effect of deformation delayed creep and shrinkage of the concrete on the seismic response of shear walls reinforced concrete strengthened with composite materials having a sinusoidal distribution of fibers. The lateral stiffness of shear walls RC, adhesives and composite material taking into account the phenomenon of creep and shrinkage of concrete described by the Eurocode 2, and widthwise varying fiber volume fraction of the composite plate has been determined by a finite element model. Large earthquakes recorded in Algeria (El-Asnam and Boumerdes) have been tested to demonstrate the accuracy of the proposed method. Numerical results obtained are discussed and the factors influencing the seismic response of reinforced concrete shear walls strengthened taking account the effects of the delay mechanism creep and shrinkage of concrete are highlighted. Prospects are being studied
Published: 2014
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Author: Yahiaoui T., Meftah S.M.A., Belferhat S., and Imine B.
Subjects: Physics, QC1-999
Abstract: In the present study, an experimental study is presented for a flow around an isolated wing equipped by a winglet and profiled with Naca 0012. Several cases of winglets were tested according to the angle ß: 0°, 55°, 65°and 75°. For all these cases at a velocity of 20, 30 and 40 meters per second, wind tunnel tests are performed and compared for different angles of incidence. It is observed that the aerodynamic performance of the winglet with β= 55° differ favorably for positive angle of incidence compared for other cases.
Published: 2013
Full Text: View/download PDF

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