Secondary instability of stationary vortex packets in a swept wing boundary layer Chernoray, V.G., Dovgal, A.V., Kozlov, V.V., Löfdahl, L. 2004 In Proc. of XXI International Congress of Theoretical and Applied Mechanics, Warsaw, Poland, 1–2, Aug. 15–21, Paper no FM2-11339 The fact is that stationary vortex packets are most likely to be generated under natural flight conditions on the wing and these disturbances lead to breakdown the fastest. A detailed experimental study on the formation of crossflow vortex mode packets and their secondary instability in a swept wing boundary layer was carried out.   check pdf