PATTERN RECOGNITION ANALYSIS OF ORGANISED EDDY STRUCTURES IN A NUMERICALLY SIMULATED TURBULENT PLANE JET
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By applying pattern recognition analysis, the organised eddy structures in the near and intermediate fields (10-40 jet diameters) of a numerically simulated turbulent plane jet have been investigated. The Reynolds number based on the jet width is 1, 600. The results of the nearly full simulation show good agreement with the experimental measurements in the near and intermediate regions (<40 diameters) of the jet. Patterns of organised eddy structures have been extracted from the three-dimensional simulation databases. Ensemble averaged fields of three velocity components and pressure in the spanwise and transverse planes suggest the existence of inclined vortex pairs. These highly three-dimensional vortical structures are confined to one side of the jet centreplane and approximately align with the principal axis of rate-of-strain. Some of the topological features of these averaged eddy structures have been examined.
AuthorsLo, Sing Hon
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