Vianney DUBOIS, Mathieu LUGRIN, Julien DANDOIS

DOI Number: N/A

Conference number: HiSST-2025-050

Direct numerical simulations of transitional and turbulent hypersonic boundary layers are performed on a flat plate geometry to reproduce the free stream acoustic perturbations observed in conventional hypersonic wind tunnels. Transition of the boundary layer is achieved through volume forcing computed either from optimal perturbation modes obtained with a resolvent-based linear stability analysis or following a random forcing approach. This numerical setup allows to simulate the noise radiation not only from the turbulent region but also from the transition region. For all three cases, the characteristics of the noise generated by the turbulent region compare well with existing data. When using a harmonic forcing to trigger the transition, the spectral content of the transition region is reflected into the acoustic perturbations originating from this region, whereas the radiation from the turbulent region shows broadband spectra.

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In Categories: 1.Events, 1.HiSST 2025, High-Speed Aerodynamics and Aerothermodynamics with application to hypersonic regimes
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