Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session ZC05: Aeroacoustics II
12:50 PM–3:00 PM,
Tuesday, November 21, 2023
Room: 102A
Chair: Keith Gillis, National Institute of Standards and Technology
Abstract: ZC05.00009 : Bayesian optimization of the acoustic response of short holes*
2:34 PM–2:47 PM
Presenter:
Dania Ahmed
(Imperial College London)
Authors:
Dania Ahmed
(Imperial College London)
Juan Guzmán-Iñigo
(City, University of London)
Aimee S. Morgans
(Imperial College London)
In the current study, we consider a hole flow with a temperature gradient, and numerically optimize the hole geometry to maximise its acoustic absorption using Bayesian optimisation. The two-step numerical approach of Guzmán-Iñigo et al. (2022) is used, in which the incompressible Reynolds-Averaged Navier-Stokes (RANS) and energy equation are firstly solved to compute the mean flow through the hole in the presence of temperature gradient. The second step involves solving the flow perturbations superimposed on the mean hole bias flow via the linearised Navier-Stokes equations (LNSE). These two steps (including meshing) are repeated for every geometry optimization iteration.
The geometrical modification proposed uses rounded fillets on both the upstream and downstream edges of the hole, with the fillet radii as the optimisation parameters. The effect on a hole whose length and diameter have similar values, and which initially generates acoustic energy via “whistling” is demonstrated. The output of this study offers a route for designing short holes whose acoustic damping properties are maximized.
*This research is funded by the European Research Council (ERC) Consolidator Grant AFIRMATIVE (2018–2023).
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