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Prediction of Aerodynamically Induced Hood Vibration of Trailing Vehicles

Auza Gutierrez, Rodrigo
http://rave.ohiolink.edu/etdc/view?acc_num=osu1546472529004518

Abstract Details

2019, Master of Science, Ohio State University, Aero/Astro Engineering.
This thesis details aeroelastic response prediction of hoods on automobiles in the wake of a leading vehicle. Such conditions can lead to significant hood vibration due to the unsteady loads caused by vortex shedding. A primary focus is the sensitivity of the aeroelastic response to the aerodynamic modeling fidelity. This is assessed by considering both Reynolds-Averaged Navier-Stokes (RANS) and Detached Eddy Simulation (DES) flow models. The aeroelastic analysis is carried out by coupling a commercial computational Fluid dynamics (CFD) solver (StarCCM+) to a commercial computational structural dynamics (CSD) solver (Abaqus). Two different configurations are considered: 1) sedan-sedan and 2) sedan-SUV. This enables the consideration of both varied geometry and structural stiffness on the aeroelastic response. Comparisons between RANS and DES emphasize the importance of turbulence modeling fidelity in order to capture the unsteadiness of the flow and the vibration response of the hood. These comparisons include analysis of the lift forces, pressure loads on the hood, and Power Spectral Density Analysis (PSD) of the flow in the region between the two vehicles. As expected, DES predicts higher frequency content and significantly higher turbulence levels than RANS. Both the sedan and SUV hoods are sensitive to the turbulent fluctuations predicted by DES. The increased levels of turbulence result in up to 40 - 60% higher maximum peak to peak deformation and the excitation of a torsional mode of the hood for the sedan-sedan case. For the more flexible hood configuration (sedan - SUV), these differences are even higher, with maximum peak to peak deformations of up to 17 – 71% higher than the RANS solution.
Jack McNamara, PhD (Advisor)
Austin Kimbrell (Committee Member)
Mei Zhuang, PhD (Committee Member)
74 p.
Aerospace Engineering; Automotive Engineering; Engineering
computational fluid dynamics, computational structural dynamics, fluid-structure interaction, turbulence modeling, Reynolds averaged Navier Stokes, Detached eddy simulation, automotive

Recommended Citations

Citations

  • Auza Gutierrez, R. (2019). Prediction of Aerodynamically Induced Hood Vibration of Trailing Vehicles [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1546472529004518

    APA Style (7th edition)

  • Auza Gutierrez, Rodrigo . Prediction of Aerodynamically Induced Hood Vibration of Trailing Vehicles . 2019. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1546472529004518.

    MLA Style (8th edition)

  • Auza Gutierrez, Rodrigo . "Prediction of Aerodynamically Induced Hood Vibration of Trailing Vehicles ." Master's thesis, Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1546472529004518

    Chicago Manual of Style (17th edition)

osu1546472529004518
660
© 2019, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.