Experimental Study of Swept Impinging Oblique Shock/Boundary-Layer Interactions

Padmanabhan, Sathyan; Maldonado, Jorge Castro; Threadgill, James A.; Little, Jesse

doi:10.2514/1.j058910

Cited by 28 publications

(12 citation statements)

References 42 publications

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“…Whereas this scenario is fully consistent with the findings of Erengil & Dolling (1993), it is a bit hard to reconcile it with more recent experiments (Padmanabhan et al. 2021).…”

Section: Discussionsupporting

confidence: 63%

“…(2018), Adler & Gaitonde (2020) and Padmanabhan et al. (2021). The latter study reports that the rippling motion is associated with low-frequency dynamics at spanwise-constant characteristic frequency, and that it corresponds to disturbances being advected at speed increasing with the spanwise distance, hence with increasing wavelength.…”

Section: Discussionmentioning

confidence: 99%

“…Whereas Erengil & Dolling (1993) suggested a spanwise decrease of the typical frequencies, more recent studies tend to support invariance (Adler & Gaitonde 2020; Padmanabhan et al. 2021).…”

Section: Introductionmentioning

confidence: 99%

“…2018; Padmanabhan et al. 2021). All the above studies of swept SBLIs agree about the importance of three-dimensional effects on low-frequency unsteadiness, with consensus on an increase of the typical frequencies with the sweep angle.…”

Section: Introductionmentioning

confidence: 99%

“…Depending on the shock strength and the sweep angle, the interaction is characterized by either parallel or diverging separation/reattachment lines along the spanwise direction, which correspond to cylindrical or conical symmetry conditions, respectively (Settles, Perkins & Bogdonoff 1980). This is the case for flows over swept compression ramps (Settles et al 1980;Erengil & Dolling 1993;Vanstone et al 2017;Adler & Gaitonde 2018, 2020, around sharp fins (Schmisseur & Dolling 1994;Gaitonde et al 1999;Arora, Mears & Alvi 2019) and for swept impinging oblique SBLIs (Doehrmann et al 2018;Padmanabhan et al 2021). All the above studies of swept SBLIs agree about the importance of three-dimensional effects on low-frequency unsteadiness, with consensus on an increase of the typical frequencies with the sweep angle.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2023

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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.

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“…Whereas this scenario is fully consistent with the findings of Erengil & Dolling (1993), it is a bit hard to reconcile it with more recent experiments (Padmanabhan et al. 2021).…”

Section: Discussionsupporting

confidence: 63%

Section: Discussionmentioning

confidence: 99%

“…Whereas Erengil & Dolling (1993) suggested a spanwise decrease of the typical frequencies, more recent studies tend to support invariance (Adler & Gaitonde 2020; Padmanabhan et al. 2021).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

et al. 2023

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Entrainment Mechanism Analysis of Oblique Shock-Wave/Boundary-Layer Interactions

Meng,

Han,

Yang

2024

IUTAM Bookseries

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The interaction between shock waves and boundary layers impacts hypersonic vehicles’ aerodynamic structure, internal turbulent mixing, and combustion processes. Direct numerical simulations (DNSs) of the hypersonic boundary layer have been performed to study the turbulent/non-turbulent interface (TNTI) entrainment mechanism and the impact of shock waves. Two cases are analyzed with and without the shock-wave and boundary layer interaction. A novel approach is proposed to identify TNTI by integrating the vorticity threshold and fuzzy clustering method. To account for the influence of increasing Reynolds number in the flow direction on the vorticity threshold analysis, vorticity is normalized using the local boundary layer thickness and friction velocity. Two entrainment mechanisms are quantitatively described and compared using TNTI local entrainment velocity and the mass conservation equation. The results demonstrate that the entrainment process within the hypersonic boundary layer TNTI is predominantly governed by large-scale engulfment, and under the influence of shock waves, the dominance of large-scale ingestion is notably enhanced.

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