Two-dimensional axisymmetric simulation of under-expanded supersonic impinging jet

M. Li, J. Soria, A. Ooi

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther


This paper investigates the unsteady flow features of two-dimensional (2D) axisymmetric under-expanded supersonic impinging jet with a nozzle pressure ratio (NPR) of 3.5 and a distance ratio (z/D) of 2.5. A comparison between 2D axisymmetric, three-dimensional (3D) Large Eddy Simulation (LES) and experimental data is given. Good agreement can be seen in mean profiles and shock location data. Utilizing spectral and Proper Orthogonal Decomposition (POD) tools, two acoustic contributions of the 2D axisymmetric simulation are observed at the dominant tone frequency. The first one is responsible for acoustic waves propagating to the far field and the other one observed from the sides of the jet plume contributes to the feedback mechanism. Furthermore, the oscillation of the stand-off shock may be one of the triggers of the feedback mechanism of 2D axisymmetric simulation, which is consistent with Henderson and Powell’s hypothesis[4].

Original languageEnglish
Title of host publicationProceedings of the 21st Australasian Fluid Mechanics Conference
EditorsTimothy C.W. Lau, Richard M. Kelso
PublisherAustralasian Fluid Mechanics Society
ISBN (Electronic)9780646597843
Publication statusPublished - 2018
EventAustralasian Fluid Mechanics Conference 2018 - Adelaide Convention Centre, Adelaide, Australia
Duration: 10 Dec 201813 Dec 2018
Conference number: 21st

Publication series

NameProceedings of the 21st Australasian Fluid Mechanics Conference, AFMC 2018


ConferenceAustralasian Fluid Mechanics Conference 2018
Abbreviated titleAFMC 2018
Internet address

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