Evolution of coherent structures in under-expanded supersonic impinging jets

Paul C. Stegeman, Julio Soria, Andrew Ooi

Research output: Contribution to conferencePaper

Abstract

This study looks at the spatio-temporal dynamics of the coherent structures found in under-expanded supersonic impinging jets from a circular nozzle at a pressure ratio of 3.4 and standoff distances of {2d, 5d}. In these jets the development of coherent structures within the shear layer and their interaction with a standoff-shock are the principle components of a fundamental non-linear acoustic feedback mechanism. Temporally resolved and phase averaged data for each case was generated from a three dimensional hybrid large-eddy simulation on a non-uniform structured cylindrical grid with computational domains consisting of approximately 30 million nodes. From these datasets we investigate the development of the energy, topology and turbulence interactions of the coherent structures as a function of their distance travelled along the shear-layer.

Original languageEnglish
Number of pages2
Publication statusPublished - 2015
EventEuropean Turbulence Conference 2015 - Delf, Netherlands
Duration: 25 Aug 201528 Aug 2015
Conference number: 15th

Conference

ConferenceEuropean Turbulence Conference 2015
Abbreviated titleETC 2015
CountryNetherlands
CityDelf
Period25/08/1528/08/15

Cite this

Stegeman, P. C., Soria, J., & Ooi, A. (2015). Evolution of coherent structures in under-expanded supersonic impinging jets. Paper presented at European Turbulence Conference 2015, Delf, Netherlands.