Quadrant analysis of persistent spatial velocity perturbations over square-bar roughness

Dubravka Pokrajac, Lorna Jane Campbell, Vladimir Ivanovich Nikora, C. Manes, Ian Kenneth McEwan

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

We explore a new application of the quadrant method in the context of the double-averaged Navier-Stokes equations for studying open channel flow near rough beds. Quadrant analysis is applied to spatial disturbances of time-averaged velocity components, using the experimental data from flow over two-dimensional regular transverse square-bar roughness. The spatial velocity disturbances change periodically performing a full cycle over a single roughness element, so that the quadrant diagrams are regular closed orbits. A colour code is used to produce a quadrant map of the flow cross-section, which reveals contributions from each quadrant to the time-averaged momentum transfer.

Original languageEnglish
Pages (from-to)413-423
Number of pages11
JournalExperiments in Fluids
Volume42
Issue number3
DOIs
Publication statusPublished - Mar 2007

Keywords

  • turbulent-boundary-layer
  • channel flow
  • wall
  • canopies
  • smooth
  • bed

Cite this

Quadrant analysis of persistent spatial velocity perturbations over square-bar roughness. / Pokrajac, Dubravka; Campbell, Lorna Jane; Nikora, Vladimir Ivanovich; Manes, C.; McEwan, Ian Kenneth.

In: Experiments in Fluids, Vol. 42, No. 3, 03.2007, p. 413-423.

Research output: Contribution to journalArticle

Pokrajac, Dubravka ; Campbell, Lorna Jane ; Nikora, Vladimir Ivanovich ; Manes, C. ; McEwan, Ian Kenneth. / Quadrant analysis of persistent spatial velocity perturbations over square-bar roughness. In: Experiments in Fluids. 2007 ; Vol. 42, No. 3. pp. 413-423.
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