Symmetry properties of developing three-dimensional laminar disturbances in plane Poiseuille flow.

Authors: Alfredsson, P.H., Bergström, L.
Document Type: Article
Pubstate: Published
Journal: Phys. Fluids
Volume: 6   1618-1620
Year: 1994


The evolution of a finite-amplitude point-like laminar disturbance in plane Poiseuille flow is investigated using hot-wire anemometry. In contrast to earlier experiments, the initial disturbance was introduced simultaneously through both the upper and lower wall of the channel, resulting in an antisymmetric disturbance in the normal velocity. Although the initial disturbance mainly generated symmetrical streamwise velocity modes, the subsequent development of the perturbation showed a marked tendency for antisymmetry.