Characteristics of mean flow and turbulence statistics of depth-limited flows with submerged vegetation in a rectangular open-channel

Sung-Uk Choi, Hyeongsik Kang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

This paper reports a numerical investigation of the characteristics of mean flow and turbulence statistics for a depth-limited flow with submerged vegetation in a rectangular channel. To achieve this, the double-averaged Navier–Stokes equations were solved using the Reynolds stress closure model. A zone with increased velocity was observed at the corner between sidewall and free surface, thus forming two velocity maxima, one at the centre of the channel and one at the corner. This is consistent with previous experimental observations. The velocity maximum at the corner can be attributed to the enlarged bottom vortex caused by submerged vegetation, which transports high-momentum fluids from the centre to the corner of the channel. The velocity maximum at the corner was found to occur in the flow with submerged vegetation regardless of roughness density and relative submergence. The velocity maximum at the corner affects the mean flow, but has a negligible effect on turbulence statistics.

Original languageEnglish
Pages (from-to)527-540
Number of pages14
JournalJournal of Hydraulic Research
Volume54
Issue number5
DOIs
Publication statusPublished - 2016 Sep 2

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submerged vegetation
Turbulence
turbulence
Statistics
submergence
roughness
vortex
momentum
Momentum
Vortex flow
Surface roughness
statistics
Fluids
fluid

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Water Science and Technology

Cite this

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abstract = "This paper reports a numerical investigation of the characteristics of mean flow and turbulence statistics for a depth-limited flow with submerged vegetation in a rectangular channel. To achieve this, the double-averaged Navier–Stokes equations were solved using the Reynolds stress closure model. A zone with increased velocity was observed at the corner between sidewall and free surface, thus forming two velocity maxima, one at the centre of the channel and one at the corner. This is consistent with previous experimental observations. The velocity maximum at the corner can be attributed to the enlarged bottom vortex caused by submerged vegetation, which transports high-momentum fluids from the centre to the corner of the channel. The velocity maximum at the corner was found to occur in the flow with submerged vegetation regardless of roughness density and relative submergence. The velocity maximum at the corner affects the mean flow, but has a negligible effect on turbulence statistics.",
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Characteristics of mean flow and turbulence statistics of depth-limited flows with submerged vegetation in a rectangular open-channel. / Choi, Sung-Uk; Kang, Hyeongsik.

In: Journal of Hydraulic Research, Vol. 54, No. 5, 02.09.2016, p. 527-540.

Research output: Contribution to journalArticle

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