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Instantaneous two-dimensional velocity fields behind a backwardfacing step in open channel were successively investigated by the use of flow visualization and digital image processing. Instantaneous spatial distributions of fluctuating velocity vectors, pressure and spanwise vorticity were presented and discussed. Space-time distribution of the longitudinal velocity close to the channel bed and the temporal variation of spanwise vorticity were estimated in order to clarify the low-frequency unsteadiness in the separation bubble. The low-frequency unsteadiness seems to be dependent on the strength of spanwise vorticity in the reattachment zone.

Unsteady Characteristics of the Separated Shear Layer Behind a Backward-Facing Step in Open Channel