Abstract
The behaviour of wall-bounded shear layers that can be represented by a Blasius profile is studied with reference to very low frequency excitation. The whole shear layer executes a heaving motion, which is referred to as the Klebanoff mode. This has been observed experimentally for a long time, but no theoretical explanation was available so far. Here some theoretical results are presented which indicate that such low frequency excitation produces three-dimensional disturbance waves whose wave lengths are very large compared to the shear-layer thickness. This, and other properties of such a wave system, explains the observed Klebanoff mode.
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