Görtler vortices behavior and prediction in dual-incident shock-wave/turbulent-boundary-layer interactions

Li, Xin; Zhang, Yue; Yu, Hang; Lin, Zhoubin; Tan, Hui-Jun; Sun, Shu-Ming

doi:10.1063/5.0100718

Cited by 12 publications

(1 citation statement)

References 60 publications

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“…Other visualizations of elongated striations of the wall-heat transfer were reported by Benay et al [199] on an axisymmetric cylinder-ŕare model at 𝑀 ∞ =5, by Zhuang et al [200], who used nano-tracer planar laser scattering in a Mach-3 compression ramp ŕow, and, in hypersonic ŕows over compression ramps, by Schrĳer [201] and Roghelia et al [202] at 𝑀 ∞ =7.5 and 𝑀 ∞ =7.7, and Zapryagaev and Kavun [203] and Trubitsyna et al [204] at 𝑀 ∞ =6. Recently, Li et al [205] experimentally investigated vortices in the presence of dual-incident shock-wave/turbulent-boundary-layer interactions in a Mach 2.48 ŕow. The curvature of the streamlines in the reattachment region was recognized as the cause for the formation of Görtler vortices.…”

Section: E Flows Over Compression Ramps and Impacted By Impinging Shocksmentioning

confidence: 99%

Görtler Instability and Transition in Compressible Flows

Xu,

Ricco,

Duan

2024

AIAA Journal

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We present a discussion on theoretical, experimental, and computational research studies on Görtler instability and the related transition to turbulence occurring in compressible boundary layers over concave surfaces. We first examine the theoretical results on primary and secondary instabilities, emphasizing the role of receptivity, the mechanism by which external agents, such as freestream fluctuations or wall roughness, act on a boundary layer to trigger Görtler vortices. We review experimental findings obtained from measurements in supersonic and hypersonic wind tunnels and discuss studies employing numerical methods, focusing on the direct numerical simulation approach. The research in these two last sections is surveyed according to the geometrical configuration, from simple concave walls to more complex surfaces of hypersonic vehicles. The experimental investigations have been successful in the visualizations of Görtler vortices, in the measurement of the wall-heat transfer in the transitional region, and in the computation of the Görtler-vortex growth rates, although detailed boundary-layer velocity measurements are still missing. Direct numerical simulations have confirmed instability results emerging from stability theories and revealed nonlinear interactions between Görtler vortices and other disturbances. The established initial-boundary-value receptivity theory can certainly benefit from more advanced experimental measurements, and receptivity results should be used in combination with direct numerical simulations. A major conclusion of our review is therefore that the understanding of Görtler vortices should be pursued by a combined methodology including theoretical analysis based on the receptivity formalism, direct numerical simulation, and experiments. Highly desirable outcomes of such endeavor are the prediction of the location and extension of the transition region, and a model for the transition process. We finally highlight further prospects and challenges on fundamental and applied research on Görtler instability and transition in compressible flows.

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