What is it about?
In this study, the authors investigate the impact of various parameters, such as the relative location of the shock with respect to the panel, panel orientation, frequency alignment in fluid and structure, and cavity pressure beneath the panel, on the panel's response to loading from the flow. This section focuses on imposing loads from shock-boundary layer interaction (SBLI) on a compliant panel without any feedback of surface motion to the flow, referred to as one-way fluid to structure (F->S) interaction. Furthermore, the authors examine the effects of imparting a fixed motion to the panel on the characteristics of shock-boundary layer interaction (SBLI). This exploration provides insights into SBLI sensitivity to surface motion, while the structure remains unaffected by the flow loadings. This one-way structure to fluid (S->F) interaction involves oscillating the panel at a fixed frequency, which beneficially modifies the SBLI characteristics, including the suppression of low-frequency oscillations, lower skin-friction values, and a relatively gradual rise in surface pressure.
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Why is it important?
The studies allows insights into the use of one-way interactions to study characteristics of fluid-structure interaction studies. Firstly the F->S study, demonstrates the use of precomputed fluid simulation databases, allowing relatively computationally cheap parametric studies, to identify outlier cases of targeted two-way coupled studies. Also, since the coupling mechanism between fluid and structure is absent, any features that F->S study is able to capture as observed in a coupled simulation or an experimental study, highlights that such features are not primarily driven by fluid-structural coupling, underscoring the forced nature of the response. Example of such case are shown in the paper. In S->F study the authors are able to capture the effects of surface motion, at frequency in mid-frequency range of the SBLI. This panel motions has an attenuating effect on the much lower breathing frequency. The flow seems to have intermittent separation and reattachment behaviour. The surface motion brings into light certain favourable modifications to the SBLI, highlighting the applicability of such a study from a flow control perspective. These favourable modifications include attenuation of the aforementioned low frequency, lower skin friction values, relatively less steep rise in surface pressure, etc. Wall pressure spectra and Lagrangian model analysis are employed to get further insights into the flow fields.
Perspectives
High-Speed Fluid-Structure Interaction (FSI) is a very complicated multi-physics class of problems. Simulating and experimenting for high-speed FSI studies is generally extremely challenging task. The F->S study allows conducting long parametric studies to indentify interesting cases for much more expensive coupled simulations, while also giving insights into identifying scenarios when fluid-structural coupling is weak. The S->F analysis gives insights into effects of surface motion on the SBLI. The study highlights the potential of targeted modifications in the SBLI features from surface motions, which can be very useful from FSI perspective.
Anshul Suri
Ohio State University
Read the Original
This page is a summary of: One-Way Fluid-Structure Interactions in Turbulent Shock-Boundary Layer Interactions, January 2024, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2024-1156.
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