Abstract
Unsteady flow structure behind an Ahmed body with a slant angle of 35°, corresponding to the low-drag regime, has been experimentally investigated at Re of 6.59 × 104. Measurements are conducted using single hotwire and flow visualization techniques. The major flow characteristics are examined. A total of five distinct Strouhal numbers (St) have been identified in the wake, as the case of the high-drag regime. Two detected over the rear window are linked to vortices generated along the roof and side surfaces of the model, respectively, and two found near the ground surface are ascribed to vortices produced by the struts (wheels) of the body. The fifth one, with St = 0.3, captured behind the base is distinct from its counterpart found in the high-drag regime and a physical explanation is proposed for this St.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Tunay T, Sahin B, Ozbolat V (2014) Effects of rear slant angles on the flow characteristics of Ahmed body. Exp Therm Fluid Sci 57(2014):165–176
Zhang BF, To S, Zhou Y (2014) Strouhal numbers of unsteady flow structures around a simplified car model. In: Zhou Y, Liu Y, Huang L, Hodges D (eds) Fluid-structure-sound interactions and control. Springer, Berlin, Heidelberg, pp 179–184
Zhang BF, Zhou Y, To S (2015) Unsteady flow structures around a high-drag Ahmed body. J Fluid Mech 777:291–326 (2015)
Acknowledgements
Authors acknowledge support from the Hong Kong Scholar Program and China Postdoctoral Science Foundation through grants 2012M510874, 2012T50314 and 2014M551180. Supports from Research Grants Council of HKSAR through grant GRF 531912 and from Shenzhen Government through grant JCYJ20130329154125496 are also gratefully acknowledged.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2019 Springer Nature Singapore Pte Ltd.
About this paper
Cite this paper
Zhang, Y., Zhang, B., Zhou, Y. (2019). Unsteady Flow Structure Behind A Low-Drag Ahmed Body. In: Zhou, Y., Kimura, M., Peng, G., Lucey, A., Huang, L. (eds) Fluid-Structure-Sound Interactions and Control. FSSIC 2017. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-10-7542-1_12
Download citation
DOI: https://doi.org/10.1007/978-981-10-7542-1_12
Published:
Publisher Name: Springer, Singapore
Print ISBN: 978-981-10-7541-4
Online ISBN: 978-981-10-7542-1
eBook Packages: EngineeringEngineering (R0)