Effect of plunging motion on the pitch oscillating NACA0012 airfoil is investigated using computational fluid dynamics (CFD). A simulation model based on overset grid technology and *k - ω<\/em> shear stress transport (SST) turbulence model is established, and the numerical simulation results are compared with available experimental data and other simulations. Two cases of phase angle φ = 0, μ <\/em>which represents the phase difference between the pitching and plunging motions of an airfoil are performed. Airfoil vortex generation, moving, and shedding are discussed in detail. Good agreements have been achieved with the available literature. The upward plunging motion made the equivalent angle of attack less than the actual one during pitching analysis. It is observed that the formation of the stall vortex is suppressed, resulting in a decrease in the lift coefficient and a delay of the stall angle. However, the downward plunging motion made the equivalent angle of attack higher the actual one.<\/p>\r\n","references":"[1]\tL. W. Carr, \u201cProgress in analysis and prediction of dynamic stall,\u201d Journal of Aircraft, vol. 25(1), pp. 6-17, 2012.\r\n[2]\tW. Geissler, M. Raffel, G. Dietz, et al. \u201cHelicopter aerodynamics with emphasis placed on dynamic stall,\u201d in EUROMECH Colloquium 464b Wind Energy, DLR, 2007.\r\n[3]\tT. Lee and S. Basu, \u201cMeasurement of unsteady boundary layer developed on an oscillating airfoil using multiple hot-film sensors,\u201d Experiments in Fluids, Vol. 25(2), pp. 108\u2013117, 1998.\r\n[4]\tH. Sadeghi, and M. Mani, \u201cMeasurements of the flow field behind a helicopter blade using the hot-wire anemometry,\u201d Journal of Information Communication Technology, Vol. 2, pp. 32\u201339, 2009.\r\n[5]\tW. J. McCroskey, \u201cThe phenomenon of dynamic stall,\u201d NASA Technical report TM-81624, 1981.\r\n[6]\tW. J. McCroskey, \u201cUnsteady airfoils,\u201d Annual Review of Fluid Mechanics, Vol. 14(1), pp. 285-311, 2003.\r\n[7]\tG. Barakos and D. Drikakis, \u201cComputational study of unsteady turbulent flows around oscillating and ramping airfoil,\u201d International Journal of Numerical Methods in Fluids, Vol. 42(2), pp. 163\u2013186, 2003.\r\n[8]\tW. Sheng, R. A. Galbraith, and F. N. Coton, \u201cA modified dynamic stall model for low Mach numbers,\u201d ASME Journal of Solar Energy Engineering, Vol. 130(3), pp. 310\u2013313, 2008.\r\n[9]\tK. Gharali and D. A. Johnson, \u201cNumerical modeling of an S809 airfoil under dynamic stall, erosion and high reduced frequencies,\u201d Applied Energy, Vol. 93 (5), pp. 45-52, 2012.\r\n[10]\tP. Wernert, W. Geissler, M. Raffel and J. Kompenhans, \u201cExperimental and numerical investigations of dynamic stall on a pitching airfoil,\u201d AIAA Journal, Vol. 34 (5), pp. 982\u2013989, 1996.\r\n[11]\tE. D. V. Bigarella, J. L. F. Azevedo and O. A. F. Mello, \u201cNormal force calculations for rocket-like configurations,\u201d Journal of the Brazilian Society of Mechanical Science and Engineering, Vol. 26 (3), pp. 290-296, 2004.\r\n[12]\tReynolds-Averaged Navier-Stokes Equations, article, 2009, http:\/\/www.symscape.com\/reynolds-averaged-navier-stokes-equations Accessed on 05\/06\/2017.\r\n[13]\tF. R. Menter, \u201cZonal two equation k-\u03c9 turbulence models for aerodynamic flows,\u201d AIAA-93-2906, 1993.\r\n[14]\tF. R. Menter, \u201cTwo-equation eddy-viscosity models for engineering applications,\u201d AIAA Journal, Vol. 32(8), pp. 1598-1605, 1994.\r\n[15]\tS. S. Benadict Bensiger and N. Prasanth, \u201cAnalysis of bi-convex aerofoil using CFD software at supersonic and hypersonic speed,\u201d Elixir Mechanical Engineering, Vol. 53, pp. 11695-11698, 2012.\r\n[16]\tT. Lee and P. Gerontakos, \u201cInvestigation of flow over an oscillating airfoil,\u201d Journal of Fluid Mechanics, Vol. 512, pp. 313-341, 2004.\r\n[17]\tS. Wang, S., D. B. Ingham, L. Ma, et al., \u201cNumerical investigations on dynamic stall of low Reynolds number flow around oscillating airfoils,\u201d Computers and Fluids, Vol. 39(9), pp. 1529-1541, 2010.","publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 130, 2017"}*