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

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Downloads (Pure)

Abstract

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
Pages21-26
Number of pages6
Volume22
ISBN (Electronic)9789048196319
ISBN (Print)9789048196302
DOIs
Publication statusPublished - 2010

Publication series

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

Keywords

  • boundary layer
  • rough wall
  • turbulence

Cite this

Pokrajac, D. (2010). An Experimental Study of Turbulent Flow in the Vicinity of Transverse Square Bars. In T. B. Nickels (Ed.), IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls: Proceedings of the IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls, held Cambridge, UK, July 7-9, 2009 (Vol. 22, pp. 21-26). (IUTAM Bookseries). Springer Netherlands. https://doi.org/10.1007/978-90-481-9631-9_3

An Experimental Study of Turbulent Flow in the Vicinity of Transverse Square Bars. / Pokrajac, Dubravka.

IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls: Proceedings of the IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls, held Cambridge, UK, July 7-9, 2009. ed. / T. B. Nickels. Vol. 22 Springer Netherlands, 2010. p. 21-26 (IUTAM Bookseries).

Research output: Chapter in Book/Report/Conference proceedingChapter

Pokrajac, D 2010, An Experimental Study of Turbulent Flow in the Vicinity of Transverse Square Bars. in TB Nickels (ed.), IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls: Proceedings of the IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls, held Cambridge, UK, July 7-9, 2009. vol. 22, IUTAM Bookseries, Springer Netherlands, pp. 21-26. https://doi.org/10.1007/978-90-481-9631-9_3
Pokrajac D. An Experimental Study of Turbulent Flow in the Vicinity of Transverse Square Bars. In Nickels TB, editor, IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls: Proceedings of the IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls, held Cambridge, UK, July 7-9, 2009. Vol. 22. Springer Netherlands. 2010. p. 21-26. (IUTAM Bookseries). https://doi.org/10.1007/978-90-481-9631-9_3
Pokrajac, Dubravka. / An Experimental Study of Turbulent Flow in the Vicinity of Transverse Square Bars. IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls: Proceedings of the IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls, held Cambridge, UK, July 7-9, 2009. editor / T. B. Nickels. Vol. 22 Springer Netherlands, 2010. pp. 21-26 (IUTAM Bookseries).
@inbook{3606567d212743418c04bcc778cf01ca,
title = "An Experimental Study of Turbulent Flow in the Vicinity of Transverse Square Bars",
abstract = "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.",
keywords = "boundary layer, rough wall, turbulence",
author = "Dubravka Pokrajac",
year = "2010",
doi = "10.1007/978-90-481-9631-9_3",
language = "English",
isbn = "9789048196302",
volume = "22",
series = "IUTAM Bookseries",
publisher = "Springer Netherlands",
pages = "21--26",
editor = "Nickels, {T. B.}",
booktitle = "IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls",

}

TY - CHAP

T1 - An Experimental Study of Turbulent Flow in the Vicinity of Transverse Square Bars

AU - Pokrajac, Dubravka

PY - 2010

Y1 - 2010

N2 - 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.

AB - 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.

KW - boundary layer

KW - rough wall

KW - turbulence

U2 - 10.1007/978-90-481-9631-9_3

DO - 10.1007/978-90-481-9631-9_3

M3 - Chapter

SN - 9789048196302

VL - 22

T3 - IUTAM Bookseries

SP - 21

EP - 26

BT - IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls

A2 - Nickels, T. B.

PB - Springer Netherlands

ER -