Low-frequency dynamics in a shock-induced separated flow
By S. Priebe, Jonathan H. Tu, Clarence W. Rowley, M. Pino Martín. Journal of Fluid Mechanics, 2016
170 citations recorded by the source corpus.
The low-frequency unsteadiness in the direct numerical simulation of a Mach 2.9 shock wave/turbulent boundary layer interaction with mean flow separation is analysed using dynamic mode decomposition (DMD). The analysis is applied both to three-dimensional and spanwise-averaged snapshots of the flow. The observed low-frequency DMD modes all share a common structure, characterized by perturbations along the shock, together with streamwise-elongated regions of low and high momentum that originate at the shock foot and extend into the downstream flow. A linear superposition of these modes, with dynamics governed by their corresponding DMD eigenvalues, accurately captures the unsteadiness of the shock. In addition, DMD analysis shows that the downstream regions of low and high momentum are unsteady and that their unsteadiness is linked to the unsteadiness of the shock. The observed flow structures in the downstream flow are reminiscent of Görtler-like vortices that are present in this type of flow due to an underlying centrifugal instability, suggesting a possible physical mechanism for the low-frequency unsteadiness in shock wave/turbulent boundary layer interactions.
Subfields: Aerospace Engineering, Computational Mechanics
View Paper: https://www.semanticscholar.org/paper/1c683f5b5201949711f726a1ade0860afd761662
How researchers see this paper
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In Aerospace Engineering
- Stefan Hickel
- Vito Pasquariello
- Nikolaus A. Adams
- Sergio Pirozzoli
- B. M. P. Martin
- Alexander A. Zheltovodov
- M. Loginov
- Matteo Bernardini
In Computational Mechanics
- Stefan Hickel
- Vito Pasquariello
- Nikolaus A. Adams
- Sergio Pirozzoli
- Alexander A. Zheltovodov
- Christophe Bogey
- Christophe Bailly
- B. M. P. Martin
Citations in the corpus
- Unsteady effects of strong shock-wave/boundary-layer interaction at high Reynolds number (2017, result): “While Priebe et al. (2016) remain in doubt whether the observed dynamics constitutes an unusual event due to a relatively short time duration captured in their DNS (200δ0/U0), our results with a much longer time period of 3805δ0/U0 confirm this assertion.”