Experimental analysis of intermittent coherent structures in the near field of a high Re turbulent jet flow

Experimental data obtained in the near region of a turbulent jet flow (from $\text{x/D=0}$ up to $\text{x/D=19,}$ where D is the jet diameter and x is the axial coordinate) are processed through wavelet decomposition. A wavelet based technique for coherent structures identification is applied to the longitudinal and transverse velocity data series obtained by X probe hot wire anemometry measurements. This methodology permits the evolution with x of the time signature of coherent structures to be analyzed. The statistics of the local turbulent energy magnitude is also discussed and the temporal dynamics is studied by the analysis of the time of appearance of the most energetic structures evolving with $\mathrm{x/D.}$