Transition mechanism behind a backward-facing step in a supersonic flow

Weibo Hu; Stefan Hickel; Bas van Oudheusden

Transition mechanism behind a backward-facing step in a supersonic flow

Weibo Hu, Stefan Hickel, Bas van Oudheusden

Aerodynamics

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

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Abstract

The path of laminar-to-turbulent transition behind a backward-facing step (BFS) in the supersonic regime at Ma = 1.7 and Re_δ₀ = 13718 is investigated using a very well-resolved large eddy simulation (LES). Five distinct stages are identified in the transition process by the visualisation of instantaneous flow. The transition is initiated by a Kelvin-Helmholtz (K-H) instability of the separated shear layer, followed by secondary modal instabilities of the distorted K-H vortices, leading to Λ-shaped vortices, hair-pin vortices and finally to a fully turbulent state around the reattachment location. Spectral analysis and proper orthogonal decomposition (POD) reveal that the low-frequency breathing dynamics also plays a major role in the transition process.

Original language	English
Title of host publication	Proceedings of the 11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019
Subtitle of host publication	30/07/19 - 2/08/19 Southampton, United Kingdom
Number of pages	6
Publication status	Published - 1 Jan 2019
Event	11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019 - Southampton, United Kingdom Duration: 30 Jul 2019 → 2 Aug 2019

Conference

Conference	11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019
Country	United Kingdom
City	Southampton
Period	30/07/19 → 2/08/19

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Dynamics of a supersonic flow over a backward/forward-facing step
Hu, W. (Creator), Hickel, S. (Creator) & van Oudheusden, B. W. (Creator), TU Delft - 4TU.Centre for Research Data, 2020
DOI: 10.4121/UUID:4F8C3413-9EDE-4BE8-BD69-4247F685F7DC
Dataset

Cite this

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title = "Transition mechanism behind a backward-facing step in a supersonic flow",

abstract = "The path of laminar-to-turbulent transition behind a backward-facing step (BFS) in the supersonic regime at Ma = 1.7 and Reδ0 = 13718 is investigated using a very well-resolved large eddy simulation (LES). Five distinct stages are identified in the transition process by the visualisation of instantaneous flow. The transition is initiated by a Kelvin-Helmholtz (K-H) instability of the separated shear layer, followed by secondary modal instabilities of the distorted K-H vortices, leading to Λ-shaped vortices, hair-pin vortices and finally to a fully turbulent state around the reattachment location. Spectral analysis and proper orthogonal decomposition (POD) reveal that the low-frequency breathing dynamics also plays a major role in the transition process.",

author = "Weibo Hu and Stefan Hickel and {van Oudheusden}, Bas",

note = "Green Open Access added to TU Delft Institutional Repository {\textquoteleft}You share, we take care!{\textquoteright} – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.; 11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019 ; Conference date: 30-07-2019 Through 02-08-2019",

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Hu, W , Hickel, S & van Oudheusden, B 2019, Transition mechanism behind a backward-facing step in a supersonic flow. in Proceedings of the 11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019: 30/07/19 - 2/08/19 Southampton, United Kingdom. 11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019, Southampton, United Kingdom, 30/07/19.

Transition mechanism behind a backward-facing step in a supersonic flow. / Hu, Weibo ; Hickel, Stefan ; van Oudheusden, Bas.

Proceedings of the 11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019: 30/07/19 - 2/08/19 Southampton, United Kingdom. 2019.

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

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AU - Hu, Weibo

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N1 - Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

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N2 - The path of laminar-to-turbulent transition behind a backward-facing step (BFS) in the supersonic regime at Ma = 1.7 and Reδ0 = 13718 is investigated using a very well-resolved large eddy simulation (LES). Five distinct stages are identified in the transition process by the visualisation of instantaneous flow. The transition is initiated by a Kelvin-Helmholtz (K-H) instability of the separated shear layer, followed by secondary modal instabilities of the distorted K-H vortices, leading to Λ-shaped vortices, hair-pin vortices and finally to a fully turbulent state around the reattachment location. Spectral analysis and proper orthogonal decomposition (POD) reveal that the low-frequency breathing dynamics also plays a major role in the transition process.

AB - The path of laminar-to-turbulent transition behind a backward-facing step (BFS) in the supersonic regime at Ma = 1.7 and Reδ0 = 13718 is investigated using a very well-resolved large eddy simulation (LES). Five distinct stages are identified in the transition process by the visualisation of instantaneous flow. The transition is initiated by a Kelvin-Helmholtz (K-H) instability of the separated shear layer, followed by secondary modal instabilities of the distorted K-H vortices, leading to Λ-shaped vortices, hair-pin vortices and finally to a fully turbulent state around the reattachment location. Spectral analysis and proper orthogonal decomposition (POD) reveal that the low-frequency breathing dynamics also plays a major role in the transition process.

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M3 - Conference contribution

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T2 - 11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019

Y2 - 30 July 2019 through 2 August 2019

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Transition mechanism behind a backward-facing step in a supersonic flow

Abstract

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Dynamics of a supersonic flow over a backward/forward-facing step

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