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Unsteady flow structure behind a low-drag ahmed body

  • Yingchao Zhang
  • , Bingfu Zhang
  • , Yu Zhou*
  • *Corresponding author for this work
  • Jilin University
  • Hong Kong Polytechnic University
  • Harbin Institute of Technology Shenzhen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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.

Original languageEnglish
Title of host publicationFluid-Structure-Sound Interactions and Control- Proceedings of the 4th Symposium on Fluid-Structure-Sound Interactions and Control, 2019
EditorsLixi Huang, Yu Zhou, Motoaki Kimura, Guoyi Peng, A.D. Lucey
PublisherPleiades Publishing
Pages81-86
Number of pages6
ISBN (Print)9789811075414
DOIs
StatePublished - 2019
Externally publishedYes
Event4th Symposium on Fluid-Structure-Sound Interactions and Control, FSSIC 2017 - Tokyo, Japan
Duration: 21 Aug 201724 Aug 2017

Publication series

NameLecture Notes in Mechanical Engineering
ISSN (Print)2195-4356
ISSN (Electronic)2195-4364

Conference

Conference4th Symposium on Fluid-Structure-Sound Interactions and Control, FSSIC 2017
Country/TerritoryJapan
CityTokyo
Period21/08/1724/08/17

Keywords

  • Ahmed body wake
  • Unsteady flow structure
  • Vehicle model Strouhal number

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