In this research, a different view of turbulent flow pattern and mechanism passing around a full-span wing with sinusoidal leading-edge is numerically investigated and the results are compared to the baseline wing. In this simulation, the Navier-Stokes equations are discretized by the finite volume method and solved using the improved turbulence model (IDDES). Furthermore, to enhance the maneuverability of a fix-winged micro aerial vehicle (MAV), a passive flow control method was employed, which was inspired by the buoyancy fin of a special species of whale called a humpback. In order to study the performance of this type of infinite wing, the Reynolds number was considered equal to 140000. The results show extensive variations between these two types of full-span wings. The sinusoidal leading-edge full-span wing, in contrast to the baseline infinite wing, has severe fluctuations in pressure distribution and flow pattern at the pre-stall region. These variations are caused by the dominance of lateral flows over longitudinal flows on this type of infinite wing. Therefore, researching the patterns and analysis of vortices formed on this type of aerofoil as well as the associated frequencies is always a useful tool for understanding physics of flow on them, which will provide designers with a new perspective on flying objects.

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