The influence of vehicle body roll motion on aerodynamic characteristics under crosswind condition
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 25 September 2023
Issue publication date: 22 November 2023
Abstract
Purpose
The purpose of this study is investigate the transient aerodynamic characteristics of high-speed vehicle with body roll motion under crosswind condition to improve aerodynamic stability.
Design/methodology/approach
An overset mesh was used to simulate the rolling motion of the vehicle body. A wind tunnel experiment was conducted to validate the numerical method.
Findings
The results revealed that the vehicle’s aerodynamic characteristics changed periodically with the body’s periodic motion. In the absence of crosswind, the pressure distribution on the left and right sides of the vehicle body was symmetrical, and the speed streamline flowed to the rear of the vehicle in an orderly manner. The maximum aerodynamic lift observed in the transient simulation was −0.089, which is approximately 0.70 times that of the quasi-static simulation experiment. In addition, the maximum aerodynamic side force observed in the transient simulation was 0.654, which is approximately 1.25 times that of the quasi-static simulation experiment.
Originality/value
The aerodynamic load varies periodically with the vehicle body’s cyclic motion. However, the extreme values of the aerodynamic load do not occur when the vehicle body is at its highest or lowest position. This phenomenon is primarily attributed to the mutual interference of airflow viscosity and the hysteresis effect in the flow field, leading to the formation of a substantial vortex near the wheel. Consequently, the aerodynamic coefficient at each horizontal position becomes inconsistent during the periodic rolling of the vehicle body.
Keywords
Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 52076072), the Science and Technology Innovation Program of Hunan Province (Grant No. 2021GK2017) and Research Foundation of Education Bureau of Hunan Province (Grant No. 21A0396).
Declaration of competing interest: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Citation
Taiming, H., Ma, J., Zhang, L., Hao, P., Feng, M., Zeng, W. and Ou, C. (2023), "The influence of vehicle body roll motion on aerodynamic characteristics under crosswind condition", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 33 No. 12, pp. 4138-4157. https://doi.org/10.1108/HFF-06-2023-0337
Publisher
:Emerald Publishing Limited
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