Investigations of time-growing instabilities in laminar separation bubbles

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Direct numerical simulations of forced and unforced separation bubbles on an airfoil at incidence (2008, result): “However, Hammond & Redekopp (1998) determined a higher critical value of 20 % for Falkner–Skan-type boundary layers and Rist & Maucher (2002) determined that, even in the case of 20 % reverse flow, the wall-normal distance and intensity of the shear layer had to exceed a certain threshold before…”
A Combined Experimental/Numerical Study of Unsteady Phenomena in a Laminar Separation Bubble (2003, methodology): “According to a classification made in [ 12 ], this is characteristic for an inviscid free shear-layer type instability (so-called Kelvin–Helmholtz instability).”
On the onset of nonlinear oscillations in a separating boundary-layer flow (2003, background): “It has, for instance, been shown in Rist & Maucher (2002) that the height, together with the amount of reverse flow, has a strong influence on stability.”