Abstract-
The flow field in the region where a moving wall slides under a
stationary one produces a coherent vortical structure if the Reynolds number is
large enough. Experiments were conducted in the Reynolds number range 5 ·
102 – 5 · 105, where the Reynolds number
develops during an experiment and is
defined as Re = UL/n, where L is the distance the
impulsively started wall has moved from rest and U is the wall speed. For this
Reynolds number range the vortex was observed to transition from laminar
behavior at Re = 13 · 103 to fully turbulent by Re = 40
· 103. Transition is marked by the formation of centrifugal
instabilities on the outer turn of the primary vortex.
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