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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Influence of cross-sectional shape on flow patterns
Influence of cross-sectional shape on flow patterns
Author : LAURENT SCHINDFESSEL(1), ST╔PHAN CRE╦LLE(1) & TOM DE MULDER(1)
ABSTRACT
The state-of-the-art hydrodynamic knowledge on schematized open-channel confluences is largely based on laboratory
experiments in channels with a rectangular cross-section. Since in practice man-made canals often have a nonrectangular
cross-section, the question can be raised to which extent the knowledge on open-channel confluences still
holds for confluences of that type of canals. Therefore, this paper examines the influence of three cross-sectional shapes
on the flow patterns in an asymmetric 90░ open-channel confluence with fixed concordant bed and subcritical flows
throughout. Large-eddy simulations are performed for a rectangular, a chamfered rectangular and a trapezoidal section.
The simulations for the non-rectangular sections show that the location of both the mixing layer between the incoming
flows and the shear layer between the separation zone and the contracted section are altered in comparison to the
rectangular section case. Also the evolution of the separation zone is found to be different. It is demonstrated that the
distribution of incoming momentum and the shape of the confluence corners are primary causes of the observed
deviations.
File Size : 1,845,112 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 17/08/2015
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