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High-Fidelity Modeling and Prediction of Hood Buffeting of Trailing Automobiles
Technical Paper
2020-01-5038
ISSN: 0148-7191, e-ISSN: 2688-3627
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Automotive Technical Papers
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English
Abstract
The importance of fluid-structure interaction (FSI) is of increasing concern in automotive design criteria as automobile hoods become lighter and thinner. This work focuses on computational simulation and analysis of automobile hoods under unsteady aerodynamic loads encountered at typical highway conditions while trailing another vehicle. These driving conditions can cause significant hood vibrations due to the unsteady loads caused by the vortex shedding from the leading vehicle. The study is carried out using coupled computational fluid dynamics (CFD) and computational structural dynamics (CSD) codes. The main goal of this work is to characterize the importance of fluid modeling fidelity to hood buffeting response by comparing fluid and structural responses using both Reynolds-Averaged Navier-Stokes (RANS) and detached eddy simulation (DES) approaches. Results are presented for a sedan trailing another sedan. 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, power spectral density (PSD) analysis of the flow in the region between the two vehicles, and displacement at discrete points on the hood. As expected, DES predicts higher frequency content and significantly higher turbulence levels than RANS. The hood response is found to be sensitive to these characteristics. 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 trailing vehicle hood.
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Citation
Auza, R., McNamara, J., Kimbrell, A., Rupp, T. et al., "High-Fidelity Modeling and Prediction of Hood Buffeting of Trailing Automobiles," SAE Technical Paper 2020-01-5038, 2020, https://doi.org/10.4271/2020-01-5038.Data Sets - Support Documents
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References
- Pesich , J. , McNamara , J. , Kimbrell , A. , and Kang , P. Steady Aeroelastic Response Prediction and Validation for Automobile Hoods SAE Int. J. Passeng. Cars - Mech. Syst. 11 4 251 262 2018 https://doi.org/10.4271/06-11-04-0021
- Ratzel , M. and Dias , W. Fluid-Structure Interaction Analysis and Optimization of an Automotive Component SAE Technical Paper 2014-01-2446 2014 https://doi.org/10.4271/2014-01-2446
- Massegur , D. , Quaranta , G. , and Cavagna , L. An Indy Car Rear Wing Is Designed for Aeroelastic Response Using Multidisciplinary Optimization ANSYS Advantage 1 1 1 50 2007
- Patil , S. , Lietz , R. , Woodiga , S. et al. Fluid Structure Interaction Simulations Applied to Automotive Aerodynamics SAE Technical Paper 2015-01-1544 2015
- Gaylard , A. , Beckett , M. , Gargoloff , J. et al. CFD-Based Modelling of Flow Conditions Capable of Inducing Hood Flutter SAE Technical Paper 2010-01-1011 2010 https://doi.org/10.4271/2010-01-1011
- Gupta , A. , Gargoloff , J. , and Duncan , B. Response of a Prototype Truck Hood to Transient Aerodynamic Loading SAE Technical Paper 2009-01-1156 2009 https://doi.org/10.4271/2009-01-1156
- Ashton , N. , West , A. , Lardeau , S. , and Revell , A. Assessment of RANS and DES Methods for Realistic Automotive Flows Journal of Fluids and Structures 27 5-6 807 816 2011
- Guilmineau , E. et al. Numerical Simulation with a DES Approach for Automotive Flows Journal of Fluids and Structures 27 5-6 807 816 2011 https://doi.org/10.1016/j.jfluidstructs.2011.03.010