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Advances in Aircraft and Spacecraft Science
  Volume 9, Number 2, March 2022 , pages 131-148

CFD Simulation of NACA 2412 airfoil with new cavity shapes
Samuel Merryisha, Parvathy Rajendran and Sher Afghan Khan

    The paper presents the surface-modified NACA 2412 airfoil performance with variable cavity characteristics such as size, shape and orientation, by numerically investigated with the pre-validation study. The study attempts to improve the airfoil aerodynamic performance at 30 m/s with a variable angle of attack (AOA) ranging from 0o to 20o under Reynolds number (Re) 4.4x105. Through passive surface control techniques, a boundary layer control strategy has been enhanced to improve flow performance. An intense background survey has been carried out over the modifier orientation, shape, and numbers to differentiate the sub-critical and post-critical flow regimes. The wallbounded flows along with its governing equations are investigated using Reynolds Average Navier Strokes (RANS) solver coupled with one-equational transport Spalart Allmaras model. It was observed that the aerodynamic efficiency of cavity airfoil had been improved by enhancing maximum lift to drag ratio ((l/d) max) with delayed flow separation by keeping the flow attached beyond 0.25C even at a higher angle of attack. Detailed investigation on the cavity distribution pattern reveals that cavity depth and width are essential in degrading the early flow separation characteristics. In this study, overall general performance comparison, all the cavity airfoil models have delayed stalling compared to the original airfoil.
Key Words
    aerodynamic performance; cavity; CFD simulation; flow separation; surface modifier; surface roughness; variable orientation
Samuel Merryisha: School of Aerospace Engineering, Universiti Sains Malaysia, Engineering Campus, Nibong Tebal 14300, Pulau Pinang, Malaysia
Parvathy Rajendran: School of Aerospace Engineering, Universiti Sains Malaysia, Engineering Campus, Nibong Tebal 14300, Pulau Pinang, Malaysia; Faculty of Engineering & Computing, First City University College, Bandar Utama, Petaling Jaya 47800, Selangor, Malaysia
Sher Afghan Khan: Department of Mechanical Engineering, Faculty of Engineering, International Islamic University,
Kuala Lumpur 53100, Selangor, Malaysia

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