Eddy Structures in a Simulated Plane Turbulent Jet Educed by Pattern Recognition Analysis

The organised eddy structures in the near and intermediate fields of a numerically simulated turbulent plane jet have been studied using pattern recognition analysis. The Reynolds number based on the jet width is 1,600. Patterns of organised eddy structures have been educed from the three-dimensional large-eddy simulation databases. Ensemble averaged fields of three velocity components in the spanwise and cross-stream planes suggest the existence of inclined vortex pairs. These highly three-dimensional vortical structures are confined to either 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 are examined.