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New approach for predicting flow bifurcation at right-angled open-channel junction

Lookup NU author(s): Dr Georges Kesserwani, Job Vazquez, Professor Qiuhua Liang


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An unsteady mathematical model for predicting flow divisions at a right-angled open-channel junction is presented. Existing dividing models depend on a prior knowledge of a constant flow regime. In addition, their strong nonlinearity does not guarantee compatibility with the St. Venant solutions in the context of an internal boundary condition treatment. Assuming zero crest height at the junction region, a side weir model explicitly introduced within the one-dimensional St. Venant equations is used to cope with the two-dimensional pattern of the flow. An upwind implicit numerical solver is employed to compute the new governing equations. The performance of the proposed technique in predicting super-, trans-, and subcritical flow bifurcations is illustrated by comparing with experimental data and/or theoretical predictions. In all the tests, lateral-to-upstream discharge ratios (Rq) are successfully reproduced by the present technique with a maximum error magnitude of less than 9%.

Publication metadata

Author(s): Kesserwani G, Vazquez J, Riviere N, Liang Q, Travin G, Mose R

Publication type: Article

Publication status: Published

Journal: Journal of Hydraulic Engineering

Year: 2010

Volume: 136

Issue: 9

Pages: 662-668

Print publication date: 12/03/2010

ISSN (print): 0733-9429

ISSN (electronic): 1943-7900

Publisher: ASCE


DOI: 10.1061/(ASCE)HY.1943-7900.0000222


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