A numerical analysis of transient flow past road vehicles subjected to pitching oscillation

Cheng, S. Y.; Tsubokura, M.; Nakashima, T. et al.

Journal of Wind Engineering and Industrial Aerodynamics, 2011, 99(5), 511-522

Permalink : https://hdl.handle.net/2115/49339

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アクセス権
open access
URI
https://hdl.handle.net/2115/49339
タイトル
A numerical analysis of transient flow past road vehicles subjected to pitching oscillation
著者
Cheng, S. Y. ; Tsubokura, M. ; Nakashima, T. ; Nouzawa, T. ; Okada, Y.
著者名
Cheng, S. Y.
e-Rad_Researcher
40313366
著者名
Tsubokura, M.
著者名
Nakashima, T.
著者名
Nouzawa, T.
著者名
Okada, Y.
言語
英語
キーワード
Vehicle
Transient aerodynamics
Pitching
LES
Stability
Vortex
発行日
2011-05
出版者
Elsevier
収録物名
Journal of Wind Engineering and Industrial Aerodynamics
巻(号)
99(5)
ページ
511-522
抄録
Conventionally, the pitching instability of road vehicles has been controlled mechanically through the application of suspension systems. The present study demonstrates how unsteady aerodynamics can be exploited for such control by properly configuring vehicle body shapes. To discern the effect of unsteady aerodynamics on road vehicle stability, large eddy simulation has been conducted to simulate the flow past simplified vehicle models. Forced-sinusoidal-pitching oscillation was imposed on the models during the simulation to probe their dynamic responses. Numerical results were compared with wind tunnel measurements for validation, and good agreement is attained. Unsteady flow structures above the rear section of the vehicles were found to significantly affect their pitching stability. Depending on the vehicle body shape configurations, the induced aerodynamic force tended to either enhance or restrain the vehicles' pitching instability.
資源タイプ
学術雑誌論文
出版タイプ
Accepted Manuscript
PISSN
0167-6105
関連情報 (isVersionOf)
出版社版DOI
https://doi.org/10.1016/j.jweia.2011.02.001