Passive Control of Shock-Wave/Turbulent Boundary-Layer Interaction Using Spanwise Heterogeneous Roughness

IF 2 3区工程技术 Q3 MECHANICS Flow, Turbulence and Combustion Pub Date : 2024-09-04 DOI:10.1007/s10494-024-00580-0

Wencan Wu, Luis Laguarda, Davide Modesti, Stefan Hickel

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Abstract

A novel passive flow-control method for shock-wave/turbulent boundary-layer interactions (STBLI) is investigated. The method relies on a structured roughness pattern constituted by streamwise-aligned ridges. Its effectiveness is assessed with wall-resolved large-eddy simulations of the interaction of a Mach 2 turbulent boundary layer flow with an oblique impinging shock with shock angle \(40^\circ\). The structured roughness pattern, which is fully resolved by a cut-cell based immersed boundary method, covers the entire computational domain. Results show that this rough surface induces large-scale secondary streamwise vortices, which energize the boundary layer by transporting high-speed fluid closer to the wall. A parametric study is performed to investigate the effect of the spacing between the ridges. This investigation is further substantiated through spectral analysis and sparsity-promoting dynamic mode decomposition. We find that ridges with small spacing effectively mitigate the low-frequency unsteadiness of STBLI and slightly reduce total-pressure loss.

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利用横向异质粗糙度对冲击波/湍流边界层相互作用进行被动控制

研究了冲击波/湍流边界层相互作用（STBLI）的一种新型被动流控制方法。该方法依赖于由流线对齐的脊构成的结构化粗糙度模式。通过壁面分辨大涡流模拟 2 马赫湍流边界层流与具有冲击角 \(40^\circ\)的斜向冲击的相互作用，评估了该方法的有效性。通过基于切割单元的沉浸边界法完全解析的结构粗糙度模式覆盖了整个计算域。结果表明，这种粗糙表面会诱发大规模的次级流向涡流，通过将高速流体输送到更靠近壁面的地方来激活边界层。对参数进行了研究，以探讨脊间距的影响。通过频谱分析和稀疏性促进动模分解进一步证实了这一研究。我们发现，间距较小的脊可有效缓解 STBLI 的低频不稳定性，并略微降低总压力损失。

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来源期刊

Flow, Turbulence and Combustion 工程技术-力学

CiteScore

5.70

自引率

8.30%

发文量

审稿时长

2 months

期刊介绍： Flow, Turbulence and Combustion provides a global forum for the publication of original and innovative research results that contribute to the solution of fundamental and applied problems encountered in single-phase, multi-phase and reacting flows, in both idealized and real systems. The scope of coverage encompasses topics in fluid dynamics, scalar transport, multi-physics interactions and flow control. From time to time the journal publishes Special or Theme Issues featuring invited articles. Contributions may report research that falls within the broad spectrum of analytical, computational and experimental methods. This includes research conducted in academia, industry and a variety of environmental and geophysical sectors. Turbulence, transition and associated phenomena are expected to play a significant role in the majority of studies reported, although non-turbulent flows, typical of those in micro-devices, would be regarded as falling within the scope covered. The emphasis is on originality, timeliness, quality and thematic fit, as exemplified by the title of the journal and the qualifications described above. Relevance to real-world problems and industrial applications are regarded as strengths.