Abstract
This research focuses on the analysis of the instability of passenger vehicles associated with transient crosswind gusts. A new vehicle model, created to analyze the behavior of unsteady wakes on bluff bodies, is proposed. This test model called Willy is designed using the following criteria: the geometry is realistic compared to a real vehicle, the model's plane under-body surface is parallel to the ground, and the separations are limited to the region of the base for a moderated yaw angle. In the present paper, the tests are performed on the model animated by an oscillating yaw angle at a frequency of 2 Hz in a steady wind. Experiments are carried out at Reynolds number of 0.9 × 106 at the Conservatoire National des Arts et Métiers and computations are performed at the Ecole Centrale de Nantes. The numerical results are compared with experimental data.
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Acknowledgments
Experiments were performed by Mr. Jean-Luc Alleau in the framework of preparation for an engineering degree from the CNAM. We would like to thank Mr. E. Äissaoui for his help and cooperation. The authors gratefully acknowledge the Scientific Committee of IDRIS (project 0129) and of CINES (project dmn2049) for the attribution of CPU time.
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Guilmineau, E., Chometon, F. (2009). Experimental and Numerical Study of Unsteady Wakes Behind an Oscillating Car Model. In: Braza, M., Hourigan, K. (eds) IUTAM Symposium on Unsteady Separated Flows and their Control. IUTAM Bookseries, vol 14. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-9898-7_32
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DOI: https://doi.org/10.1007/978-1-4020-9898-7_32
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