Secondary turbulent flow in an infinte bend

H. Bo Christensen; Kjartan Gislason; Jørgen Fredsøe

Secondary turbulent flow in an infinte bend

H. Bo Christensen
, Kjartan Gislason
, Jørgen Fredsøe

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

Abstract

The flow in an infinite circular bend is inverstigated in both the laminar and fully turbulent flow case, by use of laminar flow solver, a k-e turbulence model, and a fully Reynolds stress turbulence model. The topic of the analysis is to investigate whether a counter-rotating secondary flow cell is formed near the surface at the outer bank. This cell might help to stabilise the bank and hereby be an important factor for the morphology in a meandering river. In the laminar runs stability criterion related to a Dean number was estabilshed. In the simulations with the k-e model and the Reynolds stress model, the influence of the curvature ratio and cross section geometry on the vortex pattern is investigated. Furthermore, it is demonstrated that an-isotropy of turbulence plays an important role for the structure of flow pattern and existence of an extra flow cell.

Original language	English
Title of host publication	I.A.H.R. Symposium on River, Coastal and Estuarine Morphodynamics
Place of Publication	Genova
Publisher	University of Genova, Department of Environmental Engineering
Publication date	1999
Publication status	Published - 1999
Event	IAHR Symposium on River, Coastal and Esturine Morphodynamics - Genoa, Italy Duration: 1 Jan 1999 → …

Conference

Conference	IAHR Symposium on River, Coastal and Esturine Morphodynamics
City	Genoa, Italy
Period	01/01/1999 → …

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Cite this

@inproceedings{30954ff8f8b744978e34fb63772db36b,

title = "Secondary turbulent flow in an infinte bend",

abstract = "The flow in an infinite circular bend is inverstigated in both the laminar and fully turbulent flow case, by use of laminar flow solver, a k-e turbulence model, and a fully Reynolds stress turbulence model. The topic of the analysis is to investigate whether a counter-rotating secondary flow cell is formed near the surface at the outer bank. This cell might help to stabilise the bank and hereby be an important factor for the morphology in a meandering river. In the laminar runs stability criterion related to a Dean number was estabilshed. In the simulations with the k-e model and the Reynolds stress model, the influence of the curvature ratio and cross section geometry on the vortex pattern is investigated. Furthermore, it is demonstrated that an-isotropy of turbulence plays an important role for the structure of flow pattern and existence of an extra flow cell.",

author = "Christensen, \{H. Bo\} and Kjartan Gislason and J{\o}rgen Freds{\o}e",

year = "1999",

language = "English",

booktitle = "I.A.H.R. Symposium on River, Coastal and Estuarine Morphodynamics",

publisher = "University of Genova, Department of Environmental Engineering",

note = "IAHR Symposium on River, Coastal and Esturine Morphodynamics ; Conference date: 01-01-1999",

}

Christensen, HB, Gislason, K & Fredsøe, J 1999, Secondary turbulent flow in an infinte bend. in I.A.H.R. Symposium on River, Coastal and Estuarine Morphodynamics. University of Genova, Department of Environmental Engineering, Genova, IAHR Symposium on River, Coastal and Esturine Morphodynamics, Genoa, Italy, 01/01/1999.

Secondary turbulent flow in an infinte bend. / Christensen, H. Bo; Gislason, Kjartan; Fredsøe, Jørgen.
I.A.H.R. Symposium on River, Coastal and Estuarine Morphodynamics. Genova: University of Genova, Department of Environmental Engineering, 1999.

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

TY - GEN

T1 - Secondary turbulent flow in an infinte bend

AU - Christensen, H. Bo

AU - Gislason, Kjartan

AU - Fredsøe, Jørgen

PY - 1999

Y1 - 1999

N2 - The flow in an infinite circular bend is inverstigated in both the laminar and fully turbulent flow case, by use of laminar flow solver, a k-e turbulence model, and a fully Reynolds stress turbulence model. The topic of the analysis is to investigate whether a counter-rotating secondary flow cell is formed near the surface at the outer bank. This cell might help to stabilise the bank and hereby be an important factor for the morphology in a meandering river. In the laminar runs stability criterion related to a Dean number was estabilshed. In the simulations with the k-e model and the Reynolds stress model, the influence of the curvature ratio and cross section geometry on the vortex pattern is investigated. Furthermore, it is demonstrated that an-isotropy of turbulence plays an important role for the structure of flow pattern and existence of an extra flow cell.

AB - The flow in an infinite circular bend is inverstigated in both the laminar and fully turbulent flow case, by use of laminar flow solver, a k-e turbulence model, and a fully Reynolds stress turbulence model. The topic of the analysis is to investigate whether a counter-rotating secondary flow cell is formed near the surface at the outer bank. This cell might help to stabilise the bank and hereby be an important factor for the morphology in a meandering river. In the laminar runs stability criterion related to a Dean number was estabilshed. In the simulations with the k-e model and the Reynolds stress model, the influence of the curvature ratio and cross section geometry on the vortex pattern is investigated. Furthermore, it is demonstrated that an-isotropy of turbulence plays an important role for the structure of flow pattern and existence of an extra flow cell.

M3 - Article in proceedings

BT - I.A.H.R. Symposium on River, Coastal and Estuarine Morphodynamics

PB - University of Genova, Department of Environmental Engineering

CY - Genova

T2 - IAHR Symposium on River, Coastal and Esturine Morphodynamics

Y2 - 1 January 1999

ER -