Abstract
While the turbulent 2D channel flow at time invariant boundary conditions is one of the most studied basic wall flows in turbulence research, far less is known about the same flow when subjected to unsteady boundary conditions. On the other hand, the effects of unsteadiness imposed on turbulent wall flows are encountered in quite a few cases of practical importance (e.g., sound propagation through flow ducts, heat transfer in pulsating flow, sediment transport by unsteady flow, etc). Several experimental investigations of the unsteady pipe and channel flow have been performed during the past decade (e.g. Mao & Hanratty [3], Tardu & Binder [4], Tardu et al [5], Beykirch et al [1]), however, these have been constricted to local measurements of the fluctuating velocity or wall shear stress in most cases. So our knowledge on the spatial and temporal structure of the flow is mainly based on the temporal structure of the measured signals. Consequently, the temporal modulation of the spatial structure of the flow that is caused by the imposed unsteadiness is far from being fully accessible so far.
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