Spatially resolved mean and unsteady surface pressure in swept SBLI using PSP

Mears, Lee; Baldwin, Andrew; Ali, Mohd Y.; Kumar, Rajan; Alvi, Farrukh S.

doi:10.1007/s00348-020-2924-x

Cited by 31 publications

(8 citation statements)

References 35 publications

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“…The use of piston theory offers a relatively simple approach for initial studies (Meijer & Dala 2016). A more accurate knowledge of surface-pressure fluctuations in swept SBLI without FSI, obtained, for example, with pressure-sensitive paint (Mears et al 2020) or highfidelity simulations (Adler & Gaitonde 2020), could offer a higher level of insight, especially if combined with model-reduction frameworks (Dowell & Hall 2001, Crowell & McNamara 2012. At the next level, the response of the flow to prescribed static and dynamic deformation (one-way coupling) may be considered; a recent example of this is the work of Brouwer et al (2017), who successfully used RANS to examine the effect of compliance on 2D-SBLI-induced separation.…”

Section: Fluid/structure Interactionsmentioning

confidence: 99%

Dynamics of Three-Dimensional Shock-Wave/Boundary-Layer Interactions

Gaitonde

Adler

2023

Annu. Rev. Fluid Mech.

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Advances in measuring and understanding separated, nominally two-dimensional (2D) shock-wave/turbulent-boundary-layer interactions (STBLI) have triggered recent campaigns focused on three-dimensional (3D) STBLI, which display far greater configuration diversity. Nonetheless, unifying properties emerge for semi-infinite interactions, taking the form of conical asymptotic behavior where shock-generator specifics become insignificant. The contrast between 2D and 3D separation is substantial; the skewed vortical structure of 3D STBLI reflects the essentially 2D influence of the boundary layer on the 3D character of the swept shock. As with 2D STBLI, conical interactions engender prominent spectral content below that of the turbulent boundary layer. However, the uniform separation length scale, which is crucial to normalizing the lowest-frequency dynamics in 2D STBLI, is absent. Comparatively, the spectra of 3D STBLI are more representative of the mid-frequency, convective, shear-layer dynamics in 2D, while phenomena associated with 2D separation-shock breathing are muted. Asymptotic behavior breaks down in many regions important to 3D-STBLI dynamics, occurring in a configuration-dependent manner. Aspects of inceptive regions near shock generators and symmetry planes are reviewed. Focused efforts toward 3D modal and nonmodal analyses, moving-shock/boundary-layer interactions, fluid/structure interactions, and flow control are suggested as directions for future work. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 55 is January 2023. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Section: Fluid/structure Interactionsmentioning

confidence: 99%

Dynamics of Three-Dimensional Shock-Wave/Boundary-Layer Interactions

Gaitonde

Adler

2023

Annu. Rev. Fluid Mech.

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“…These parameters are chosen to facilitate comparisons, documented in previous work, with concurrent or archival experiments, depending on availability. Specifically, impinging shock simulations [3] were performed in coordination with experiments by Webb et al [84], swept-compression-ramp interactions [2,7] with experiments by Vanstone et al [81,82], Vanstone and Clemens [80], and sharp-fin interactions [4,7] with experiments by Arora et al [11], Baldwin et al [15], Mears et al [49], Arora et al [12], Mears et al [50], Jones et al [42]. Since recent double-fin interactions are not available, these are performed based on conditions of archival experiments by Garrison et al [36], Garrison and Settles [35] and archival RANS calculations by Gaitonde and Shang [27].…”

Section: Stbli Configurationsmentioning

confidence: 99%

“…Some previous results from these campaigns have been described in a variety of forms, including experimental measurements of the swept-compression-ramp (SCR) [80][81][82] and sharp-fin (SF) [11,12,15,42,49,50] interactions, along with high-fidelity large-eddy simulations [2,[4][5][6][7] of both configurations. The double-fin flowfield fosters a better understanding of the separation structure-unsteadiness connection, since it combines elements of swept 3-D interactions with those of 2-D interactions-the symmetry plane, for example, shows the influence of both-and thus aids in the establishment of a more comprehensive perspective.…”

Section: Introductionmentioning

confidence: 99%

Influence of separation structure on the dynamics of shock/turbulent-boundary-layer interactions

Adler

Gaitonde

2021

Theor. Comput. Fluid Dyn.

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Shock/turbulent-boundary-layer interactions (STBLIs) are ubiquitous in high-speed flight and propulsion applications. Experimental and computational investigations of swept, three-dimensional (3-D) interactions, which exhibit quasi-conical mean-flow symmetry in the limit of infinite span, have demonstrated key differences in unsteadiness from their analogous, two-dimensional (2-D), spanwise-homogeneous counterparts. For swept interactions, represented by the swept–fin-on-plate and swept–compression–ramp-on-plate configurations, differences associated with the separated shear layers may be traced to the intermixing of 2-D (spanwise independent) and 3-D (spanwise dependent) scaling laws for the separated mean flow. This results in a broader spectrum of unsteadiness that includes relatively lower frequencies associated with the separated shear layers in 3-D interactions. However, lower frequency ranges associated with the global “breathing” of strongly separated 2-D interactions are significantly less prominent in these simple, swept 3-D interactions. A logical extension of 3-D interaction complexity is the compound interaction formed by the merging of two simple interactions. The first objective of this work is therefore to analyze the more complex picture of the dynamics of such interactions, by considering as an exemplar, wall-resolved simulations of the double-fin-on-plate configuration. We show that in the region of interaction merging, new flow scales, changes in separation topology, and the emergence of lower-frequency phenomena are observed, whereas the dynamics of the interaction near the fin leading edges are similar to those of the simple, swept interactions. The second objective is to evolve a unified understanding of the dynamics of STBLIs associated with complex configurations relevant to actual propulsion systems, which involve the coupling between multiple shock systems and multiple flow separation and attachment events. For this, we revisit the salient aspects of scaling phenomena in a manner that aids in assimilating the double-fin flow with simpler swept interactions. The emphasis is on the influence of the underlying structure of the separated flow on the dynamics. The distinct features of the compound interactions manifest in a centerline symmetry pattern that replaces the quasi-conical symmetry of simple interactions. The primary separation displays topological closure to reveal new length scales, associated unsteadiness bands, and secondary flow separation.

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“…For measurements of spatial wall-pressure correlations, the main drawback of Kulites is the requirement to use several sensors, which may drastically increase the cost of the experimental setup. Another option is to use unsteady pressure-sensitive paint, which has the advantage of providing two-dimensional unsteady pressure fields, though at the expense of complex calibration procedures and lower frequency-response range and signal-to-noise ratio than conventional pressure transducers [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%