Unsteadiness in Swept-Compression-Ramp Shock/Turbulent-Boundary-Layer Interactions

Adler, Michael C.; Gaitonde, Datta V.

doi:10.2514/6.2017-0987

Cited by 25 publications

(28 citation statements)

References 48 publications

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“…In order to simulate a turbulent flow with effectively no modeling, one would be required to use a Direct Numerical Simulation (DNS), which resolves all the scales of turbulence. However, DNS is extremely costly since the number of grid points needed to sufficiently resolve the smallest turbulent eddies scales as a function of the Reynolds number, Re [2,7]. This geometry can be seen in Figure 2.…”

Section: Simulation Of Turbulent Flowsmentioning

confidence: 99%

“…For flows of engineering interest though the flows are more often threedimensional and thus more information is needed on how these wall-models handle three-dimensional flows such as fins, cylinders, and swept ramps [5]. Adler et al provides a comparison between computational efforts and experimental results of the STBLI of a swept-compression ramp [2]. The results look promising for two dimensions, and the intent of this study will be to assess predictions of wall-models for three-dimensional shock turbulent boundary layer interactions, such as that produced by a swept-compression ramp.…”

Section: Lesmentioning

confidence: 99%

“…The geometry selected for study, in order to produce a three-dimensional shock turbulent boundary layer interaction, was a swept-ramp with a sweep angle of 30 Table 1 [7,2]. All simulations were run using a perfect-gas assumption.…”

Section: Previous Studies' Geometry and Flow Conditionsmentioning

confidence: 99%

“…The spanwise and streamwise spacing was chosen to be small enough to resolve turbulent structures in those respective directions, using the WR-LES grid of Adler et al as an estimate of the number of cells needed [2]. These grid spacings also align with the best practices of the LES community, as prescribed by Georgiadis et.…”

Section: Wm-les Gridmentioning

confidence: 99%

“…Root mean square of pressure fluctuations for the wall-resolved study of Adler et al [2] xi The turbulent nature of many flows of engineering interest is important due to the flows increased ability to transfer momentum. This increased transfer of momentum at a solid boundary, such as the surface of an aircraft, leads to higher values of quantities such as drag, heat transfer, and mass transfer.…”

mentioning

confidence: 99%

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Wall-Modeled Large Eddy Simulation of a Three-Dimensional Shock-Boundary Layer Interaction

Marco¹

2018

2018 AIAA Aerospace Sciences Meeting

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Section: Simulation Of Turbulent Flowsmentioning

confidence: 99%

Section: Lesmentioning

confidence: 99%

Section: Previous Studies' Geometry and Flow Conditionsmentioning

confidence: 99%

Section: Wm-les Gridmentioning

confidence: 99%

mentioning

confidence: 99%

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Wall-Modeled Large Eddy Simulation of a Three-Dimensional Shock-Boundary Layer Interaction

Marco¹

2018

2018 AIAA Aerospace Sciences Meeting

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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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Dynamics of strong swept-shock/turbulent-boundary-layer interactions

Adler

Gaitonde

2020

J. Fluid Mech.

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Unsteadiness in Swept-Compression-Ramp Shock/Turbulent-Boundary-Layer Interactions

Cited by 25 publications

References 48 publications

Wall-Modeled Large Eddy Simulation of a Three-Dimensional Shock-Boundary Layer Interaction

Wall-Modeled Large Eddy Simulation of a Three-Dimensional Shock-Boundary Layer Interaction

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

Dynamics of strong swept-shock/turbulent-boundary-layer interactions

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