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Journal of Applied Fluid Mechanics، جلد ۱۴، شماره ۶، صفحات ۱۶۷۹-۱۶۸۹
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عنوان انگلیسی Aeroelastic Simulation of Stall Flutter Undergoing High ‎and Low Amplitude Limit Cycle Oscillations
چکیده انگلیسی مقاله The aeroelastic behaviour of an airfoil oscillating in large and small pitch amplitudes due to nonlinearity ‎in aerodynamics is examined. The phenomenon of stall flutter resulted in the limit cycle oscillations of ‎NACA 0012 at low to intermediate Reynolds number is investigated numerically through the unsteady ‎two-dimensional aeroelastic simulation. The simulations employed unsteady Reynolds Average Navier ‎Stokes shear stress transport k-ω turbulent model with the low Reynolds number correction. The ‎simulations of the fluid-structure interaction were performed by coupling the structural equation of ‎motion with a fluid solver through the user-defined function utility. Numerical simulations were executed ‎at three different elastic axis positions; the leading-edge, 18% and 36% of the airfoil chord length. The ‎airfoil chord measures 0.156 m. The simulations were executed at the free stream velocity ranging from ‎‎5.0 m/s to 13 m/s corresponding to the Reynolds number between 51618 and 134207. Two types of ‎oscillation amplitudes were observed at each elastic axis position. At the leading-edge and 18% case, ‎small amplitude oscillations were observed while at 36%, the system underwent high amplitude ‎oscillations. The analysis revealed the cause for small oscillation amplitude is due to the separation of the ‎laminar boundary layer on the suction side of the airfoil starting at the trailing edge. High amplitude ‎oscillations occurred due to the existence of the dynamic stall phenomenon beginning at the leading-edge. ‎Small amplitude LCOs only occurred within a limited range of airspeed before it disappeared due to ‎increasing airspeed‎‎.
کلیدواژه‌های انگلیسی مقاله Stall flutter, Limit cycle oscillation, Flow separation
نویسندگان مقاله M. K. H. M. Zorkipli |
School of Aerospace Engineering, Engineering Campus, University Sains Malaysia, Nibong Tebal, ‎Penang, 14300, Malaysia

A. Abbas |
School of Mechanical Engineering, Engineering Campus, University Sains Malaysia, Nibong Tebal, ‎Penang, 14300, Malaysia

N. A. Razak |
School of Aerospace Engineering, Engineering Campus, University Sains Malaysia, Nibong Tebal, ‎Penang, 14300, Malaysia

نشانی اینترنتی https://www.jafmonline.net/article_1194_9a51d8ab1d577d9798ce29729f0097d1.pdf
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