SIMULATION OF THE FLOW OVER ELLIPTIC AIRFOILS OSCILLATING AT LARGE ANGLES OF ATTACK

✍ Scribed by M.H. AKBARI; S.J. PRICE

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 937 KB
• Volume: 14
• Category: Article
• ISSN: 0889-9746
• DOI: 10.1006/jfls.2000.0297

✦ Synopsis

The incompressible, viscous #ow over two-dimensional elliptic airfoils oscillating in pitch at large angles of attack, such that #ow 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 di!usion equations are solved sequentially at each time step. The convection equation is solved using a vortex-in-cell method, and the di!usion equation using a second-order ADI "nite-di!erence scheme. Elliptic pro"les are obtained by mapping a circle in a computational domain into the physical domain using a Joukowski transformation. The e!ects of several parameters on the #ow "eld 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.

2000 Academic Press