Browsing by Author "Olayemi Adebayo Olalekan"

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    Aerodynamic lift coefficient prediction of supercritical airfoils at transonic flow regime using convolutional neural networks (CNNs) and multi-layer perceptions (MLPs)
    (Al-Qadisiyah Journal for Engineering Sciences, 2023-05-18) Olayemi Adebayo Olalekan; Salako Isaac Oluwadolapo; Jinadu Abdulbaqi; Obalalu Martins Adebowale; Anyaegbuna Elochukwu Benjamin
    Designing an aircraft involves a lot of stages, however, airfoil selection remains one of the most crucial aspects of the design process. The type of airfoil chosen determines the lift on the aircraft wing and the drag on the aircraft fuselage. When a potential airfoil is identified, one of the first steps in deciding its optimality for the aircraft design requirements is to obtain its aerodynamic lift and drag coefficients. In the early stages of trying to select a candidate airfoil, which a whole part of the design process rests on, the conventional method for acquiring the aerodynamic coefficients is through Computational Fluid Dynamics Simulations (CFDs). However, CFD simulation is usually a computationally expensive, memory-demanding, and timeconsuming iterative process; to circumvent this challenge, a data-driven model is proposed for the prediction of the lift coefficient of an airfoil in a transonic flow regime. Convolutional Neural Networks (CNNs) and Multi-Layer Perceptrons (MLPs) were used to develop a suitable model which can learn a set of usable patterns from an aerodynamic data corpus for the prediction of the lift coefficients of airfoils. Findings from the training revealed that the models (MLPs and CNNs) were able to accurately predict the lift coefficients of the airfoil.
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    Analysis of Flow Characteristics Around an Inclined NACA 0012 Airfoil Using Various Turbulence Models
    (IOP Publishing, 2021-04-21) Olayemi Adebayo Olalekan; Ogunwoye V. O.; Olabemiwo J. T.; Jinadu Abdulbaqi; Odetunde Christopher
    The current paper presents a computational fluid dynamic analyses of the flow characteristics over an inclined NACA 0012 airfoil using various turbulence models at Mach number of 0.13. The primitive continuity and momentum equations were solved using Ansys-Fluent in turn along with Spalart-Allmaras, Realizable k – ε, and k – M shear stress transport. The response of pressure and velocity contours, lift coefficient (Cl) and drag coefficient (Cd) to inclination angle variation from – 14° to 20° are reported. Also, the values of Cl and Cd obtained from the current work were juxtaposed with the equivalent values of experimental data gotten from earlier work done by Abbott and Von Doenhoff and the comparison showed good agreement. Furthermore, the results revealed that stalling occurred between 14° and 16°.
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    Computational Fluid Dynamics Analysis of Mixed Convection Heat Transfer and Fluid Flow in a Liddriven Square Cavity Subjected to Different Heating Conditions
    (IOP Publishing, 2021-04-20) Olayemi Adebayo Olalekan; Khaled Al-Farhany; Olaogun O.; Ibiwoye M.O.; Medupin R. O.; Jinadu Abdulbaqi
    The present study investigates mixed convective and fluid flow characteristics in a lid-driven enclosure filled with air and its walls subjected to various heating conditions. The vertical (left and right) walls of the enclosure are cooled (Tc), and the bottom wall is heated to (Th) while the horizontal lid-driven upper wall is subjected to sinusoidal heating. The dimensionless governing equations (continuity, momentum, and energy transport) were implemented in COMSOL Multiphysics 5.4 software. The influences of Grashof number (103 ⩽ Gr ⩽ 105 ) and Reynold number in the interval of 1 ⩽ Re ⩽ 100 on the average Nusselt number ( NU ) for all walls of the cavity was examined. Furthermore, the results presented in the form of isotherms, streamlines, and the local and average Nusselt numbers in the enclosure for Re ⩽ 100 and Gr in the range of 103 ⩽ Gr ⩽ 105. The results indicated the highest and lowest average rate of heat transfer at the bottom and top walls of the cavity respectively. The top wall region presented a higher velocity as confirmed by the velocity contour plots.
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    Optimization of Aircraft Fuel Dump Rate towards the Mitigation of Post-Impact Fire
    (Defect and Diffusion Forum1662, 2023-06-06) Jinadu Abdulbaqi; Olayemi Adebayo Olalekan; Daniel Joshua; Odenibi John Oluwatomiwa; Tiniakov Dmytro; Koloskov Volodymyr
    This study seeks to improve the utilization of compressed air towards a faster fuel jettisoning, to increase the survival rate of passengers in the event of an accident or aborted takeoffs by augmenting the already existing means of dumping fuel with no considerable increase in overall weight. The aircraft fuel dump sub-system was isolated, this process was achieved with the aid of the venturi effect. A jet which provides a direct connection between the fuel tank and the mixing chamber sucks fuel from the tank, where bypassed air from the compressor expels the sucked air in fine particles. After running the simulation, the mass flow rate was computed. The compressed air inlet has a mass flow rate of 58.5193(Kg/S), the kerosene inlet 1.2385(Kg/S) while the outlet has a relative value of-59.6541(Kg/S).This study seeks to improve the utilization of compressed air towards a faster fuel jettisoning, to increase the survival rate of passengers in the event of an accident or aborted takeoffs by augmenting the already existing means of dumping fuel with no considerable increase in overall weight. The aircraft fuel dump sub-system was isolated, this process was achieved with the aid of the venturi effect. The engine compressor marks the start of the aircraft fuel dump sub-system while an exterior nozzle for displacing the fuel marks its end. This system achieved jettisoning through bled-off air from the compressor, passing through a converging-diverging nozzle (primary supersonic nozzle), thereby creating a vacuum in the mixing chamber. A jet that provides a direct connection between the fuel tank and the mixing chamber sucks fuel from the tank, where bypassed air from the compressor expels the sucked air in fine particles. After running the simulation, the mass flow rate was computed. The compressed air inlet has a mass flow rate of 58.5193(Kg/s), and the kerosene inlet 1.2385(kg/s) while the outlet has a relative value of -59.6541(kg/s).
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    Parametric studies of mixed convective fluid flow around cylinders of different cross‐sections
    (Wiley, 2023-05-22) Olayemi Adebayo Olalekan; Ibitoye Emmanuel Segun; Obalalu Adebowale Martins; Al-Farhany Khaled; Jolayemi Samsudeen Temidayo; Jinadu Abdulbaqi; Ajide Favour Tomisin; Adegun Kayode Isaac
    A numerical study of mixed convective heat transfer in a lid‐driven square enclosure containing a hot elliptic cylinder is conducted. The impacts of the Grashof number (103 ≤ Gr ≤ 106), Reynolds number (1.0 ≤ Re ≤100), cylinder tilt angle (0° ≤ ϕ ≤ 90°), and aspect ratio (1.0 ≤ AR ≤ 3.0) have been examined for a fluid of Pr of 0.71. The horizontal enclosure walls are insulated, while its vertical walls are restricted to a nonvarying temperature Tc, whereas a sinusoidal temperature of Th + ∆T sin(πxL/ ) is imposed on the wall of the elliptical cylinder. The governing equations are solved using COMSOL Multiphysics 5.6 software. The fluid dynamic and the heat transport profiles between the enclosure and the elliptical cylinder walls are represented by the stream function, isothermal contours, and average Nusselt number. Results estab­lished that for all the considered aspect ratios, the thermal heating range of 103 ≤ Gr ≤ 104 is predomi­nantly a conduction mechanism. The critical position of the ellipse where the inclination effect becomes insignificant is determined by the Grashof number and aspect ratio when the Re = 100. The strength of vortices and cell numbers are significantly influenced by the aspect ratio, particularly when the Gr =104 . When AR =1.0, the average heat transfer from the cylinder remains the same regardless of the cylinder's orienta­tion. The impact of cylinder orientation on heat transfer from the cylinder wall is minimal for 1.5 ≤ AR ≤ 2.0. For AR values of 2.5 ≤ AR ≤ 3.0, increasing the inclination angle does not result in improved heat transfer. The influence of the increasing inclination angle on the right wall diminishes as the angle increases, except when the Grashof number is greater than 105, where the rate of heat transfer is enhanced for inclination angles beyond 45°.