In this report, we investigate the onset of chaotic flutter in laminar and turbulent flows over a two-dimensional semi-infinite panel using time-accurate fluid–structure interaction (FSI) simulations of shock–boundary-layer interactions (SBLIs). Results indicate that the critical dynamic pressure and the nature of the panel dynamics strongly depend on the static pressure differential across the shock, the local loading, the viscous and turbulent damping in the flow, and the formation of dynamic flow separation bubbles due to the SBLIs. The structural system undergoes local instability (Hopf bifurcation) when the local loading due to panel deformation overcomes the static pressure differential across the shock. In the absence of external fluid instabilities, the structural oscillations will induce unsteadiness in the flowfield, resulting in low-frequency limit-cycle oscillations. Viscous and turbulent damping in the boundary layer also delays the bifurcation and reduces the amplitude of the oscillations. Sufficiently strong shocks can produce localized flow separations, which drive additional boundary-layer instabilities, resulting in an early bifurcation. In the presence of external fluid instabilities, the behavior of the FSI strongly depends on the nonlinear coupling of their instabilities. Chaotic oscillations are observed when the fluid instabilities are dominant enough to induce structural oscillations with broadband frequencies.

Seshendra Palakurthy

Avery Schemmel

Anup Zope

Eric Collins

Shanti Bhushan

AIAA Journal

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The AIAA Journal is dedicated to advancing aerospace and aeronautical science and technology by disseminating original research papers that reveal new theoretical developments and/or experimental results. Topics include aeroacoustics, aerodynamics, combustion, propulsion fundamentals, fluid mechanics and reactive flows, fundamental aspects of the aerospace environment, hydrodynamics, lasers and related phenomena, plasma, research instruments and facilities, structural mechanics and materials, optimization, as well as thermodynamics and thermochemistry. The journal also seeks papers that review the latest research developments in any of the aforementioned topics in depth.

AIAA Journal 是一本致力于通过传播新的理论发展和实验结果的原创研究论文，促进航天和航空科学技术进步的期刊。其主题涵盖气动声学、空气动力学、燃烧、推进基础、流体力学和反应流、航空航天环境的基本方面、流体动力学、激光及相关现象、等离子体、研究仪器和设施、结构力学与材料、优化，以及热力学和热化学。此外，期刊还欢迎对上述任何主题的最新研究发展进行深入审查的论文。

Category	Quartile
工程技术	3
工程技术, 工程宇航	3

Investigation of Chaotic Flutter Induced by Shock-Boundary-Layer Interactions

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Category	Quartile
ENGINEERING, AEROSPACE	2