On low-frequency unsteadiness in swept hypersonic shockwave/boundary layer interactions

ORAL

Abstract

We present Direct Numerical Simulations (DNS) of hypersonic Shockwave/Boundary-Layer Interactions (SBLIs) in the presence of cross flow, as a computational surrogate of genuine three-dimensional SBLIs. We analyze the low frequency dynamics of the SBLI configurations and we characterize the temporal and spatial dynamics of the shock system.

We present evidence that, in the presence of cross flow, the large scale ripples are advected at a fraction of the mean spanwise velocity and with a specific spanwise wavelength linearly proportional to the separation length.

The numerically computed peak frequencies very well conform with the predictive formula of Ceci et al. (J. Fluid Mech. 2023, vol. 956, R1).

Based on the actual findings we suggest that the same phenomenology found in the supersonic regime also holds in the hypersonic one.

*This work was supported by TEAMAero Horizon 2020 research and innovation program under grant agreement 860909 and by the Air Force Office of Scientific Research under grants FA9550-19-1-0210 and FA8655-23-1-7016. We acknowledge that the results reported in this paper have been achieved with computational resources of "IscrB_DSHOW" project, using the PRACE Research Infrastructure resource MARCONI100 based at CINECA, Casalecchio di Reno, Italy, and computational resources of Regular Access EuroHPC Project "THOR" on Karolina-GPU, based at IT4Innovations National Supercomputing Center at VSB – Technical University of Ostrava, Czech Republic.

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Publication: Planned paper: "On low-frequency unsteadiness in swept hypersonic shockwave/boundary layer interactions"

Presenters

  • Alessandro Ceci

    • University of Rome La Sapienza

Authors

  • Alessandro Ceci

    • University of Rome La Sapienza

  • Andrea Palumbo

    • University of Rome La Sapienza

  • Johan Larsson

    • University of Maryland, College Park

  • Sergio Pirozzoli

    • Sapienza University of Rome
    • University of Rome La Sapienza