Strouhal numbers of unsteady flow structures around a simplified car model

B. F. Zhang, Suet To, Y. Zhou

Research output: Chapter in book / Conference proceedingChapter in an edited book (as author)Academic researchpeer-review

1 Citation (Scopus)


This work aims to gain relatively thorough understanding of unsteady flow structures around an Ahmed body and associated predominated Strouhal numbers StAp based on the square root of the frontal area A. Extensive hotwire and flow visualization measurements were conducted in a wind tunnel at ReA =6:59 × 104 over the roof, the rear window, and behind the vertical base of this body with a slant angle of 25°. Four distinct Strouhal numbers have been identified. StA=0:196 and 0.140 are detected above the roof. StA=0:196 is captured again over the rear window, along with another unsteady structure of StA=0:265. Behind the vertical base, the wake is dominated by the quasiperiodic structures of StA=0:442. A conceptual flow structure model is proposed based on the present data as well as those in the literature.
Original languageEnglish
Title of host publicationLecture Notes in Mechanical Engineering
Number of pages6
Publication statusPublished - 1 Jan 2014

Publication series

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

ASJC Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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