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Wall Effects on Large Scale Structure Evolution in an Axisymmetric Jet
A. Benaissa, B.A. Fleck and A. Pollard

This study examines the influence of wall presence on the development of an axisymmetric jet and its implications on the evolution and dynamics of coherent structures. Experimental investigations using hot wire anemometry were carried out in order to infer some basic characteristics of the effects of wall presence and its proximity to the jet. Mean velocity, flow visualisation and conditional measurements and averaging procedures were used to identify large scale coherent structures resulting from the interaction of the ring-type vortices and the wall. The jet spread in the transverse direction appears to be governed by two events: the leading edge of the main structure in the jet and the flow region between these structures.

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