ABSTRACT
Here we review and explain instabilities of external three-dimensional flows which is complicated and seemingly contradictory to instabilities noted for two-dimensional flows. Instabilities for three-dimensional flows are more complex, as these can occur not only for the streamwise component of the flow, but additional instabilities of the cross flow component of the velocity profile need to be considered. Additionally, for aerospace applications, one has also to study the problem of leading edge contamination, i.e., instability of the flow along the attachment line, which was discussed in Chap. 4.
