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Title: Proper orthogonal decomposition analysis of near-field coherent structures associated with V-notched nozzle jets
Authors: Lim, H.D.
Ding, Junfei
Shi, Shengxian
New, Tze How
Keywords: Engineering::Mechanical engineering
Issue Date: 2019
Source: Lim, H., Ding, J., Shi, S. & New, T. H. (2019). Proper orthogonal decomposition analysis of near-field coherent structures associated with V-notched nozzle jets. Experimental Thermal and Fluid Science, 112, 109972-.
Project: MOE2014-T2-1-002
Journal: Experimental Thermal and Fluid Science
Abstract: Time-resolved particle image velocimetry measurements and proper orthogonal decomposition (POD) analysis were conducted on freely-exhausting V-notched nozzle jets at Re = 5000. Energy redistributions from low order modes to higher order modes are observed, particularly for the first two POD modes typically associated with large-scale coherent flow structures. Furthermore, analysis of the first two POD modes reveals highly cyclical large-scale coherent flow structures formed along the nozzle peak-to-peak (PP) planes, while non-cyclical incoherent flow structures are observed along the trough-to-trough (TT) planes. POD mode coefficients reveal mode pairing behaviour along the PP-planes and reduced peak frequencies in their power spectral densities. In contrast, no mode pairing behaviour is observed along the TT-planes and multiple instances of the same frequency peak transcending two adjacent POD modes are observed instead. This suggests an energy cascade process whereby large-scale flow structures are broken down into smaller-scale ones at a common frequency. Finally, a comparatively sharper nozzle leads to earlier formations of flow structures along both PP- and TT-planes but does not significantly impact upon the periodicity or coherence of the flow structures.
ISSN: 0894-1777
DOI: 10.1016/j.expthermflusci.2019.109972
Rights: © 2019 Elsevier Inc. All rights reserved. This paper was published in Experimental Thermal and Fluid Science and is made available with permission of Elsevier Inc.
Fulltext Permission: embargo_20220408
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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