Abstract
We present an experimental study of gravity driven films flowing down a sinusoidal bottom profile of high amplitude. Eddies that are created in the valleys of the undulated bottom profile under creeping flow conditions are modified as inertia becomes significant. We find that the eddies become tilted and their size increases depending on the Froude number. Surface waves, which are generated from natural noise beyond a certain Froude number, induce an oscillation and a breakup of the separatrix by the turnstile-lobe mechanism. This leads to a material exchange between the eddy and the overlying film. We show how the surface waves are coupled to the eddies and discuss the time scales associated with the material exchange of suspended particles.
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