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The Influence of Static Surface Deformation on Turbulent Boundary Layers and Downstream Ramps in Supersonic Flow

Becks, Aaron Michael
http://orcid.org/0000-0003-3368-6611
http://rave.ohiolink.edu/etdc/view?acc_num=osu1712868094992913

Abstract Details

2024, Doctor of Philosophy, Ohio State University, Aerospace Engineering.
Fluid-Structure Interactions (FSI) are a quintessential multi-disciplinary challenge, where the flowfield is influenced by the structure, and structural deformation is induced by the flow pressure. Computational and experimental research thrusts often seek to answer specific problems for specific configurations, offering observational answers to relatively complex problems. While there is a large body of work on FSI as a whole, the specific coupling mechanisms between the fluid and structural surface in the context of turbulent boundary layers (TBLs) in supersonic flows is an under-explored area of study. This dissertation details progress addressing this gap through cooperative consideration of high-fidelity simulations, classical semi-empirical models, analysis of the governing equations, and data-driven models. Large-Eddy Simulations (LES) of TBLs with static deformations are compared against classical semi-empirical models to characterize applicability to statically deformed surfaces for predicting loads transmitted from the boundary layer to the structure. Additionally, analysis of the governing equations, in conjunction with data-driven modeling, is used to extract a coherent link between structural deformation and the onset of local flow separations. Finally, a parametric study is carried out using Reynolds-Average Navier-Stokes (RANS) and Kriging surrogates to assess the impact of statically deformed surfaces on a downstream ramp. LES indicates that for a variety of deformations sized on the order of the incoming boundary layer, localized flow separation can develop. This leads to important flow modifications that are not readily captured with low-fidelity or semi-empirical models. Motivated by this, a first-order link between local flow separation and structural deformation parameters is established using the Momentum Integral Equation (MIE) combined with data-driven analysis. The curvature of the surface is identified as the dominant structural parameter impacting local skin friction and driving local flow separation. Finally, a parametric analysis using combined RANS and Kriging surrogate models identifies 3 primary characteristics for the impact of deformation on the flow response on a downstream flare: deformation-induced compression and expansion waves, deformation augmented boundary layer stabilization/destabilization, and the direct interaction of deformation with separation corner behavior. Compression and expansion wave propagation from deformed surfaces causes notable reductions in the peak loading in both pressure and heat flux. However, the boundary layer downstream separation tendency and separation characteristics are impacted differently by the type of deformation introduced, and its location relative to the corner.
Jack McNamara (Advisor)
Datta Gaitonde (Advisor)
Scott Peltier (Committee Member)
Jen-Ping Chen (Committee Member)
Lian Duan (Committee Member)
174 p.
Aerospace Engineering
FSI; Fluid-Structure Interaction; TBL; Turbulent Boundary Layer; High Speed Flow; Deformation; Kriging; Momentum Integral Equation; MIE

Recommended Citations

Citations

  • Becks, A. M. (2024). The Influence of Static Surface Deformation on Turbulent Boundary Layers and Downstream Ramps in Supersonic Flow [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1712868094992913

    APA Style (7th edition)

  • Becks, Aaron. The Influence of Static Surface Deformation on Turbulent Boundary Layers and Downstream Ramps in Supersonic Flow. 2024. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1712868094992913.

    MLA Style (8th edition)

  • Becks, Aaron. "The Influence of Static Surface Deformation on Turbulent Boundary Layers and Downstream Ramps in Supersonic Flow." Doctoral dissertation, Ohio State University, 2024. http://rave.ohiolink.edu/etdc/view?acc_num=osu1712868094992913

    Chicago Manual of Style (17th edition)

osu1712868094992913
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This open access ETD is published by The Ohio State University and OhioLINK.