Abstract
The unsteadiness of shock wave-boundary layer interactions is investigated in a transitional backward-facing step flow at Ma=1:7 and Red0 =13718 using large eddy simulation. The mean and instantaneous flow shows that the laminar inflow undergoes a laminar-to-turbulence transition in which Kelvin-Helmholtz vortices form, distort and eventually break down into small hairpin-like vortices. The interaction system features broadband frequency oscillations in a range f d0=u¥ = 0:03 _ 0:23 based on the spectral and statistical analysis. The results of dynamic mode decomposition indicate that the medium-frequency motions centered at f d0=u¥ = 0:06 are related to the shock winkling and the shedding of large coherent vortices, while the lower (centered at f d0=u¥ _ 0:01) and higher ( f d0=u¥ _ 0:1) frequency unsteadiness is associated with the periodical dilatation and shrinking of separation system and the convection of upstream K-H vortices respectively.
Original language | English |
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Title of host publication | 54th 3AF International Conference AERO2019 At: Paris, France |
Number of pages | 10 |
Publication status | Published - 2019 |
Event | 54th 3AF International Conference on Applied Aerodynamics - Paris, France Duration: 25 Mar 2019 → 27 Mar 2019 Conference number: 54 http://3af-aerodynamics2019.com/ |
Conference
Conference | 54th 3AF International Conference on Applied Aerodynamics |
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Abbreviated title | AERO 2019 |
Country/Territory | France |
City | Paris |
Period | 25/03/19 → 27/03/19 |
Internet address |
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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.ResearchData, 16 Jul 2020
DOI: 10.4121/UUID:4F8C3413-9EDE-4BE8-BD69-4247F685F7DC
Dataset/Software: Dataset