Conference Proceedings

Proper orthogonal decomposition and dynamic mode decomposition of under-expanded free-jets with varying nozzle pressure ratios

P Stegeman, A Ooi, J Soria, V Theofilis, J Soria

Fluid Mechanics and its Applications | Springer International Publishing | Published : 2015

Abstract

© Springer International Publishing Switzerland 2015. This paper provides an overview of the progress made in a study of the coherent structures of feedback loops found in under-expanded free-jets. In order to gain a better understanding of the topology and dynamics of these structures the proper-orthogonal decomposition (POD) and dynamic mode decomposition (DMD) techniques will be applied to high resolution numerical datasets.We consider a purely convergent under-expanded free jet with nozzle pressure ratios NPR = {2.2, 2.6} and a nozzle lip thickness tn/d = 1/3 where d = 15mm is the nozzle diameter. The analysis has shown that DMD is more capable than POD in extracting the structure of ins..

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University of Melbourne Researchers

Grants

Awarded by Australian Research Council's Discovery Projects funding scheme


Funding Acknowledgements

This research was supported under Australian Research Council's Discovery Projects funding scheme (project number DP1096474) and was undertaken with the assistance of resources provided at the NCI National Facility systems at the Australian National University through the National Computational Merit Allocation Scheme supported by the Australian Government.