Three-dimensional flow structure measurements behind a queue of studied model vehicles

J. F. Huang, Tat Leung Chan, Y. Zhou

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)


The three-dimensional flow structures of a queue of studied model vehicles (i.e., one-, two- and three-vehicle cases) were investigated comprehensively in a closed-circuit wind tunnel using particle image velocimetry (PIV) for the typical urban vehicle speeds (i.e., 10, 30 and 50 km/h). In this three-dimensional vehicle wake, a pair of longitudinal vortices is characterized by counter-rotating and moving downstream at relatively low velocity than their surrounding flow. The flow structures of multiple studied model vehicles are dominated by the wake generated from the last studied model vehicle but the preceding studied model vehicle(s) also has/have some minor effects. Cross-sectional turbulence distribution is non-uniform in the far-wake region for all studied cases. The lowest turbulence occurs at the center part of the vehicle wake while high turbulence occurs at its two sides. As such, it may lead to considerable underestimation in turbulence magnitude if the measurement is only taken along the centerline of the vehicle wake.
Original languageEnglish
Pages (from-to)647-657
Number of pages11
JournalInternational Journal of Heat and Fluid Flow
Issue number4
Publication statusPublished - 1 Aug 2009


  • Flow structures
  • Particle imaging velocimetry
  • Vehicle wake
  • Wind tunnel

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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