Multi-scale study of the transitional shock-wave boundary layer interaction in hypersonic flow
| Autor: | Mathieu Lugrin, Reynald Bur, Eric Garnier, Samir Beneddine |
|---|---|
| Přispěvatelé: | DAAA, ONERA, Université Paris Saclay [Meudon], ONERA-Université Paris-Saclay, DAAA, ONERA [Lille], ONERA |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Fluid Flow and Transfer Processes
Shock wave High fidelity simulation Scale (ratio) Hypersonic flow General Engineering Computational Mechanics Mechanics Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] Physics::Fluid Dynamics Boundary layer Shock-wave/boundary layer interaction 0103 physical sciences Transition Linear stability 010306 general physics Geology |
| Zdroj: | Theoretical and Computational Fluid Dynamics Theoretical and Computational Fluid Dynamics, Springer Verlag, In press, ⟨10.1007/s00162-021-00595-7⟩ |
| ISSN: | 0935-4964 1432-2250 |
| DOI: | 10.1007/s00162-021-00595-7⟩ |
| Popis: | International audience; A high-fidelity simulation of the massively separated shock/ transitional boundary layer interaction caused by a 15-degrees axisymmetrical compression ramp is performed at a free stream Mach number of 6 and a transitional Reynolds number. The chosen configuration yields a strongly multiscale dynamics of the flow as the separated region oscillates at low-frequency, and high-frequency transitional instabilities are triggered by the injection of a generic noise at the inlet of the simulation. The simulation is post-processed using Proper Orthogonal Decomposition to extract the large scale low-frequency dynamics of the recirculation region. The bubble dynamics from the simulation is then compared to the results of a global linear stability analysis about the mean flow. A critical interpretation of the eigenspectrum of the linearized Navier-Stokes operator is presented. The recirculation region dynamics is found to be dominated by two coexisting modes, a quasi-steady one that expresses itself mainly in the reattachment region and that is caused by the interaction of two self-sustained instabilities, and an unsteady one linked with the separation shock-wave and the mixing layer. The unsteady mode is driven by a feedback loop in the recirculation region, which may also be relevant for other unsteady shock-motion already documented for shock-wave/turbulent boundary layer interaction. The impact of the large-scale dynamics on the transitional one is then assessed through the numerical filtering of those low wavenumber modes; they are found to have no impact on the transitional dynamics. |
| Databáze: | OpenAIRE |
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