Interaction of quasi-two-dimensional vortical gusts with airfoils, unswept and swept wings

Abstract A nearly two-dimensional vortex of small core size has been produced by the transient plunging motion an upstream airfoil and it interacted with downstream wings. Depending on offset distance wing angle attack, incident filament deforms, diffuses, loses coherence, while inducing leading-edge formation shedding from wing. No significant spanwise flow develops in vortices during interaction. The interaction swept at each plane appears to be unaffected other planes. counter-clockwise induces a positive lift peak as approaches wing, which can predicted potential assumption. force is proportional circulation its maximum near zero-offset distance. minimum coefficient reached after just passed caused separation lower surface. coefficients for finite unswept wings estimated making correction aspect ratio using independence principle. only exception observed post-stall attack becomes parallel increases force. Graphical abstract