We derive a scaling law for the characteristic frequencies of wall pressure fluctuations in swept shock wave/turbulent boundary layer interactions in the presence of cylindrical symmetry, based on analysis of a direct numerical simulations database. Direct numerical simulations in large domains show evidence of spanwise rippling of the separation line, with typical wavelength proportional to separation bubble size. Pressure disturbances around the separation line are shown to be convected at a phase speed proportional to the cross-flow velocity. This information is leveraged to derive a simple model for low-frequency unsteadiness, which extends previous two-dimensional models (Piponniau et al., J. Fluid Mech., vol. 629, 2009, pp. 87–108), and which correctly predicts growth of the typical frequency with the sweep angle. Inferences regarding the typical frequencies in more general swept shock wave/turbulent boundary layer interactions are also discussed.

On low-frequency unsteadiness in swept shock wave–boundary layer interactions / Ceci, Alessandro; Palumbo, Andrea; Larsson, Johan; Pirozzoli, Sergio. - In: JOURNAL OF FLUID MECHANICS. - ISSN 0022-1120. - 956:(2023). [10.1017/jfm.2023.2]

On low-frequency unsteadiness in swept shock wave–boundary layer interactions

Ceci, Alessandro
Primo
;
Palumbo, Andrea
Secondo
;
Pirozzoli, Sergio
Ultimo
2023

Abstract

We derive a scaling law for the characteristic frequencies of wall pressure fluctuations in swept shock wave/turbulent boundary layer interactions in the presence of cylindrical symmetry, based on analysis of a direct numerical simulations database. Direct numerical simulations in large domains show evidence of spanwise rippling of the separation line, with typical wavelength proportional to separation bubble size. Pressure disturbances around the separation line are shown to be convected at a phase speed proportional to the cross-flow velocity. This information is leveraged to derive a simple model for low-frequency unsteadiness, which extends previous two-dimensional models (Piponniau et al., J. Fluid Mech., vol. 629, 2009, pp. 87–108), and which correctly predicts growth of the typical frequency with the sweep angle. Inferences regarding the typical frequencies in more general swept shock wave/turbulent boundary layer interactions are also discussed.
2023
compressible boundary layers; shock waves; turbulence simulation
01 Pubblicazione su rivista::01a Articolo in rivista
On low-frequency unsteadiness in swept shock wave–boundary layer interactions / Ceci, Alessandro; Palumbo, Andrea; Larsson, Johan; Pirozzoli, Sergio. - In: JOURNAL OF FLUID MECHANICS. - ISSN 0022-1120. - 956:(2023). [10.1017/jfm.2023.2]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1666225
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