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

Paul Stegeman; Andrew Ooi; Julio Soria

doi:10.1007/978-3-319-06260-0_12

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

Paul Stegeman
, Andrew Ooi
, Julio Soria

Mechanical & Aerospace Engineering

Research output: Chapter in Book/Report/Conference proceeding › Chapter (Book) › Research › peer-review

7 Citations (Scopus)

Abstract

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 instabilities from small datasets which correspond well to the experimental observations.

Original language	English
Title of host publication	Instability and Control of Massively Separated Flows: Proceedings of the International Conference on Instability and Control of Massively Separated Flows, held in Prato, Italy, from 4-6 September 2013
Editors	Vassilis Theofilis, Julio Soria
Place of Publication	Cham Switzerland
Publisher	Springer
Pages	85 - 90
Number of pages	6
ISBN (Print)	9783319062594
DOIs	https://doi.org/10.1007/978-3-319-06260-0_12
Publication status	Published - 2015

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10.1007/978-3-319-06260-0_12

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Stegeman, P., Ooi, A., & Soria, J. (2015). Proper orthogonal decomposition and dynamic mode decomposition of under-expanded free-jets with varying nozzle pressure ratios. In V. Theofilis, & J. Soria (Eds.), Instability and Control of Massively Separated Flows: Proceedings of the International Conference on Instability and Control of Massively Separated Flows, held in Prato, Italy, from 4-6 September 2013 (pp. 85 - 90). Springer. https://doi.org/10.1007/978-3-319-06260-0_12

Stegeman, Paul ; Ooi, Andrew ; Soria, Julio. / Proper orthogonal decomposition and dynamic mode decomposition of under-expanded free-jets with varying nozzle pressure ratios. Instability and Control of Massively Separated Flows: Proceedings of the International Conference on Instability and Control of Massively Separated Flows, held in Prato, Italy, from 4-6 September 2013. editor / Vassilis Theofilis ; Julio Soria. Cham Switzerland : Springer, 2015. pp. 85 - 90

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abstract = "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 instabilities from small datasets which correspond well to the experimental observations.",

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Stegeman, P, Ooi, A & Soria, J 2015, Proper orthogonal decomposition and dynamic mode decomposition of under-expanded free-jets with varying nozzle pressure ratios. in V Theofilis & J Soria (eds), Instability and Control of Massively Separated Flows: Proceedings of the International Conference on Instability and Control of Massively Separated Flows, held in Prato, Italy, from 4-6 September 2013. Springer, Cham Switzerland, pp. 85 - 90. https://doi.org/10.1007/978-3-319-06260-0_12

Proper orthogonal decomposition and dynamic mode decomposition of under-expanded free-jets with varying nozzle pressure ratios. / Stegeman, Paul; Ooi, Andrew; Soria, Julio.
Instability and Control of Massively Separated Flows: Proceedings of the International Conference on Instability and Control of Massively Separated Flows, held in Prato, Italy, from 4-6 September 2013. ed. / Vassilis Theofilis; Julio Soria. Cham Switzerland: Springer, 2015. p. 85 - 90.

Research output: Chapter in Book/Report/Conference proceeding › Chapter (Book) › Research › peer-review

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N2 - 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 instabilities from small datasets which correspond well to the experimental observations.

AB - 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 instabilities from small datasets which correspond well to the experimental observations.

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Stegeman P, Ooi A, Soria J. Proper orthogonal decomposition and dynamic mode decomposition of under-expanded free-jets with varying nozzle pressure ratios. In Theofilis V, Soria J, editors, Instability and Control of Massively Separated Flows: Proceedings of the International Conference on Instability and Control of Massively Separated Flows, held in Prato, Italy, from 4-6 September 2013. Cham Switzerland: Springer. 2015. p. 85 - 90 doi: 10.1007/978-3-319-06260-0_12

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

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