An Experimental Study of Turbulent Flow in the Vicinity of Transverse Square Bars

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This paper presents results from an experimental investigation of rough turbulent open channel flow over transverse square bars. Bar spacing was systematically varied between 2 and 20 bar heights. Velocities were measured by means of Particle Image Velocimetry (PIV), which captured details of flow fields above and between the bars. The streamlines calculated from the time-averaged flow velocities show the shape of persistent vortices in the gap between the bars. Further analysis is based on Double-Averaged Navier-Stokes equations (DANS). Momentum exchange between the flows above and within the gaps is explored using spatial quadrant analysis and the decomposition of the spatially averaged turbulent stress.

Original languageEnglish
Title of host publicationIUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls
Subtitle of host publicationProceedings of the IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls, held Cambridge, UK, July 7-9, 2009
EditorsT. B. Nickels
PublisherSpringer Netherlands
Number of pages6
ISBN (Electronic)9789048196319
ISBN (Print)9789048196302
Publication statusPublished - 2010

Publication series

NameIUTAM Bookseries
PublisherSpringer Netherlands
ISSN (Print)1875-3507
ISSN (Electronic)1875-3493


  • boundary layer
  • rough wall
  • turbulence

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