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Typology of the flow structures in dividing open channel flows

Momplot, Adrien

This paper aims at describing two different recirculation structures observed both numerically and experimentally in the lateral branch of a dividing open channel flow with identical downstream weirs. The flow conditions leading to each identified recirculation structure are also investigated. The first recirculation pattern is a classic two-dimensional closed recirculation, typically described in the literature. The second one is a three-dimensional helix-shaped recirculation that differs from the first one notably regarding the streamline behaviour. We show that the occurrence of each structure of recirculation can be predicted by means of the Froude number and the aspect ratio in the upstream channel of the bifurcation.

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Typology of the flow structures in dividing open channel flows

Momplot, Adrien

This paper aims at describing two different recirculation structures observed both numerically and experimentally in the lateral branch of a dividing open channel flow with identical downstream weirs. The flow conditions leading to each identified recirculation structure are also investigated. The first recirculation pattern is a classic two-dimensional closed recirculation, typically described in the literature. The second one is a three-dimensional helix-shaped recirculation that differs from the first one notably regarding the streamline behaviour. We show that the occurrence of each structure of recirculation can be predicted by means of the Froude number and the aspect ratio in the upstream channel of the bifurcation.

Typology of the flow structures in dividing open channel flows

Momplot, Adrien

This paper aims at describing two different recirculation structures observed both numerically and experimentally in the lateral branch of a dividing open channel flow with identical downstream weirs. The flow conditions leading to each identified recirculation structure are also investigated. The first recirculation pattern is a classic two-dimensional closed recirculation, typically described in the literature. The second one is a three-dimensional helix-shaped recirculation that differs from the first one notably regarding the streamline behaviour. We show that the occurrence of each structure of recirculation can be predicted by means of the Froude number and the aspect ratio in the upstream channel of the bifurcation.

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Title:

Typology of the flow structures in dividing open channel flows

Contributors:

Momplot, Adrien (author) / Lipeme Kouyi, Gislain / Mignot, Emmanuel / Rivière, Nicolas / Bertrand-Krajewski, Jean-Luc

Published in:

Journal of hydraulic research ; 55

Publication date:

2017

ISSN:

DOI:

https://doi.org/10.1080/00221686.2016.1212409

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

recirculation structures , hydraulic parameters , Hydraulics , Velocity , Bifurcation , hydraulic experiments , RANS model , open-channel flow

Classification:

Local classification TIB: 050/6550
BKL: 56.30 Wasserbau / 50.33 / 56.30 / 50.33 Technische Strömungsmechanik

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