Abstract
A characteristic feature of flows past many oscillating airfoils and wings is the leading-edge vortex (LEV). Although considerable progress has been made in the low-order modeling of LEV formation over airfoils, the prediction of LEV formation on finite wings remains a challenge. A low-order method is presented for modeling the formation of the LEV on finite wings. An unsteady vortex-lattice method has been augmented to model the effect of the LEV, which is modeled as a vortex sheet. The criticality of leading-edge suction is used to modulate the formation of the LEV at different spanwise locations of the wing. This feature enables prediction of the spanwise location of the LEV onset and the subsequent nonuniform growth of the LEV on the wing. A good comparison of the predicted flow features is seen with results from a higher-order Reynolds-averaged Navier–Stokes code. The predicted forces are also in reasonable agreement. The LEV sheet model has the potential to be used in a variety of low-order methods for rapid prediction of unsteady finite-wing aerodynamics.
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