SIMULATION OF THE FLOW OVER ELLIPTIC AIRFOILS OSCILLATING AT LARGE ANGLES OF ATTACK |
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| Institution: | 1. Monash University, Malaysua School of Engineering, Jalan Lagoon Selatan 47500, Bandar Sunway, Selangor Darul Ehsan, Malaysia;2. Swinburne University, PO Box 218, Hawthorn VIC 3122, Australia;1. Research Institute of Marine Systems Engineering, Department. of Naval Architecture and Ocean Engineering, Seoul National University, Seoul, Republic of Korea;2. Department of Naval Architecture and Ocean Engineering, College of Engineering, Seoul National University, 1, Gwanak-ro, Gwanak-gu, Seoul 151-744, Republic of Korea;1. School of Civil and Resource Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;2. School of Mathematics & Statistics, The University of Western Australia, Crawley 6009, Australia;3. School of Computing, Engineering & Mathematics, University of Western Sydney, Penrith 2751, Australia;1. CNES, Direction des Lanceurs, 52 rue Jacques Hillairet, 75612 PARIS CEDEX, FRANCE;2. ONERA, 2 Avenue Edouard Belin, 31055 TOULOUSE CEDEX 4, FRANCE |
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| Abstract: | The incompressible, viscous flow over two-dimensional elliptic airfoils oscillating in pitch at large angles of attack, such that flow separation occurs, has been simulated numerically for a Reynolds number of 3000. A vortex method is used to solve the two-dimensional Navier–Stokes equations in vorticity/stream-function form using a time-marching approach. Using an operator-splitting method the convection and diffusion equations are solved sequentially at each time step. The convection equation is solved using a vortex-in-cell method, and the diffusion equation using a second-order ADI finite-difference scheme. Elliptic profiles are obtained by mapping a circle in a computational domain into the physical domain using a Joukowski transformation. The effects of several parameters on the flow field are considered, such as: frequency of oscillation, mean angle of attack, location of pitch-axis and the thickness ratio of the ellipse. The results obtained are shown to compare favourably with available experimental results. |
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