numerical investigation of non-stationary parameters on effective phenomena of a pitching airfoil at lowreynolds number

Various applications of ornithopter have led to research interest in oscillation airfoils which affect on low reynolds number flight, like; pitching oscillation, heaving oscillation and flapping of a wing. the purpose of this study is investigation of aerodynamic characteristics of naca0012 airfoil with a simple harmonic pitching oscillation at zero and 10 degrees of mean angle of attack. therefore the effects of unstableparameters, including oscillation amplitude up to 10 degrees, reduced frequency up to 1.0, center ofoscillation up to 6/8 chord length, and reynolds number up to 5000 have been studied numerically. apressure based algorithm using a finite volume element method has been used to solve navier-stokesequations. according to results, variation of each studied parameters at mean angle of attack of 0 degree do not cause significant changes in flow phenomena on airfoil but at mean angle of attack of 10 degrees,changing in reduced frequency and specially reynolds number cause variations in flow phenomena. these variations are because of “wake capturing” and/or “added mass” phenomena.