Effect of Wind Gust on Flow Past Pitching Seagull Wing

In the present study, a three-dimensional seagull wing is pitched about the quarter chord axis in a sinusoidal way. To mimic gust-like realistic conditions, a time-varying velocity is imposed at the inlet. The Reynolds number (Re) based on root chord length is equal to 5000 with specified pitching amplitude and frequency. Unsteady numerical simulations are performed using Open Source Field Operation and Manipulation (OpenFOAM-8). The pitching motion is achieved using dynamic mesh utility interpolatingSolidBody motion solver, where the mesh near the wing does not morph but moves rigidly with respect to the wing, and deformation of mesh occurs away from the wing. The effects of gust parameters, i.e. IF and fg* has been studied on flow structure and force coefficients. To visualize highly unsteady and 3-D flow features across the wing, streamline topology has been shown. The effect on aerodynamic features like lift and drag is also considered. The nature of flow and the behaviour of coherent structures is predicted using marginal spectral distribution.