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.
Original language | English |
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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 |
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Country | United Kingdom |
City | Southampton |
Period | 30/07/19 → 2/08/19 |
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Datasets
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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