Mathieu Lugrin

DOI Number XXX-YYY-ZZZ

Conference Number HiSST-2022-449

A direct numerical simulation of the transitional flow around an axisymetrical compression ramp at Mach
5 is conducted for flow conditions corresponding to an experiment of Lugrin et al., 2022. The flow
is excited using a random forcing approach (white noise on density), with a noise magnitude chosen
to match the time averaged separation size data from the experiments. Unsteady numerical and experimental results are then compared to assess the ability of the random forcing approach to simulate
the receptivity process in conventional wind tunnel experiments for such complex flow where multiple
mechanisms are present. The computation reproduces the experimental mean flow and turbulent spectrum very precisely. However, the injected noise is found to be biased towards high-frequency and not
representative of the R2Ch free-stream fluctuations, which leads to strong discrepancies in the pressure
fluctuations spectrum in the laminar part of the flow. As such, the random forcing approach may introduce a bias towards some non-linear breakdown mechanisms that may be different from the one at
play in the experiments.

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In Categories: 1.Events, High-Speed Aerodynamics and Aerothermodynamics
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