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Title: A fully coupled, 6 degree-of-freedom, aerodynamic and vehicle handling crosswind simulation using the DrivAer model
Authors: Forbes, David C.
Page, Gary J.
Passmore, M.A.
Gaylard, Adrian P.
Keywords: Computational fluid dynamics
Vehicle handling
Issue Date: 2016
Publisher: © SAE International
Citation: FORBES, D.C. ... et al, 2016. A fully coupled, 6 degree-of-freedom, aerodynamic and vehicle handling crosswind simulation using the DrivAer model. SAE International Journal of Passenger Cars - Mechanical Systems, 9 (2), doi: 10.4271/2016-01-1601
Series/Report no.: SAE Paper;2016-01-1601
Abstract: In a real-world environment, a vehicle on the road is subjected to a range of flow yaw angles, the most severe of which can impact handling and stability. A fully coupled, six degrees-of-freedom CFD and vehicle handling simulation has modelled the complete closed loop system. Varying flow yaw angles are introduced via time dependent boundary conditions and aerodynamic loads predicted, whilst a handling model running simultaneously calculates the resulting vehicle response. Updates to the vehicle position and orientation within the CFD simulation are achieved using the overset grid method. Using this approach, a crosswind simulation that follows the parameters of ISO 12021:2010 (Sensitivity to lateral wind - Open-loop test method using wind generator input), was performed using the fastback variant of the DrivAer model. Fully coupled aerodynamic and vehicle response was compared to that obtained using the simplified quasi-steady and unsteady, one way coupled method. Between the quasi-steady and unsteady simulations, an overshoot in aerodynamic yaw moment for the latter resulted in a larger lateral deviation of approximately 8%. However, the differences in responses between the transient, one-way and fully coupled methods were small for this particular geometry. It is expected that by increasing gust length, differences will appear, as the vehicle is exposed to the larger flow yaw angle for a longer period.
Description: This paper was published in the journal SAE International Journal of Passenger Cars - Mechanical Systems and the definitive published version is available at http://dx.doi.org/10.4271/2016-01-1601
Version: Accepted
DOI: 10.4271/2016-01-1601
URI: https://dspace.lboro.ac.uk/2134/21523
Publisher Link: http://dx.doi.org/10.4271/2016-01-1601
ISSN: 1946-4002
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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