POD Mode Robustness for the Turbulent Jet Sampled with PIV

Chapter

Abstract

A POD robustness analysis was conducted on data obtained from two independent experiments on the turbulent axisymmetric jet. Two-component (2D2C) particle image velocimetry (PIV) measurements were conducted in a streamwise plane cutting through the centerline of the fully developed turbulent axisymmetric jet ranging from 30 to 109 diameters downstream of the nozzle. Stereoscopic PIV measurements were performed in the crossplane of the jet at a downstream distance of 40 diameters from the nozzle with the aim to test the robustness of the POD modes obtained from a Lumley Projection approach. The analysis was conducted independently for a radial extent variation with a constant radial grid density and for a radial grid density variation with a constant radial extent. The robustness tests resulted in POD mode energy redistribution and showed that the radial coverage and resolution have an effect on both the modal energies and the shape of the eigenfunctions.

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Copyright information

© Springer International Publishing Switzerland 2017

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringTechnical University of Denmark2800 Kgs. LyngbyDenmark

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