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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN 印刷: 1-56700-135-1

CHARACTERIZATION OF THE LARGE-SCALE STRUCTURES IN AN IMPINGING ELLIPTIC JET

要約

The transport characteristics of impinging jet flows are believed to be dominated by the behaviors of the large-scale flow structures. The objective of this study is to identify and quantify the large-scale coherent structures in an impinging elliptic jet flow, based on the results of the proper orthogonal decomposition (POD) applied to instantaneous vorticity field data. A series of instantaneous velocity vector fields was determined using particle image velocimetry (PIV), and instantaneous vorticity fields were calculated. Mean and turbulent kinetic energy distributions were also determined. The flow structure characterization is primarily based on the modal energy distribution (eigenvalues) and the spatial energy distribution (eigenfunctions) results from the POD analysis. This analysis points out the differences between the flow structures in the major and minor planes of the elliptic jet, and the effects of impingement distance.
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