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Influence of cross-sectional shape on flow patterns in an open-channel confluence

Laurent Schindfessel (UGent) , Stéphan Creëlle (UGent) and Tom De Mulder (UGent)
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HPC-UGent: the central High Performance Computing infrastructure of Ghent University
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.
Keywords
trapezoidal, large-eddy simulation, cross-section, open channel confluence

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Citation

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MLA
Schindfessel, Laurent, Stéphan Creëlle, and Tom De Mulder. “Influence of Cross-sectional Shape on Flow Patterns in an Open-channel Confluence.” PROCEEDINGS OF THE 36TH IAHR WORLD CONGRESS: DELTAS OF THE FUTURE AND WHAT HAPPENS UPSTREAM . E-proceedings, 2015. 2412–2422. Print.
APA
Schindfessel, L., Creëlle, S., & De Mulder, T. (2015). Influence of cross-sectional shape on flow patterns in an open-channel confluence. PROCEEDINGS OF THE 36TH IAHR WORLD CONGRESS: DELTAS OF THE FUTURE AND WHAT HAPPENS UPSTREAM (pp. 2412–2422). Presented at the 36th IAHR World Congress, E-proceedings.
Chicago author-date
Schindfessel, Laurent, Stéphan Creëlle, and Tom De Mulder. 2015. “Influence of Cross-sectional Shape on Flow Patterns in an Open-channel Confluence.” In PROCEEDINGS OF THE 36TH IAHR WORLD CONGRESS: DELTAS OF THE FUTURE AND WHAT HAPPENS UPSTREAM , 2412–2422. E-proceedings.
Chicago author-date (all authors)
Schindfessel, Laurent, Stéphan Creëlle, and Tom De Mulder. 2015. “Influence of Cross-sectional Shape on Flow Patterns in an Open-channel Confluence.” In PROCEEDINGS OF THE 36TH IAHR WORLD CONGRESS: DELTAS OF THE FUTURE AND WHAT HAPPENS UPSTREAM , 2412–2422. E-proceedings.
Vancouver
1.
Schindfessel L, Creëlle S, De Mulder T. Influence of cross-sectional shape on flow patterns in an open-channel confluence. PROCEEDINGS OF THE 36TH IAHR WORLD CONGRESS: DELTAS OF THE FUTURE AND WHAT HAPPENS UPSTREAM . E-proceedings; 2015. p. 2412–22.
IEEE
[1]
L. Schindfessel, S. Creëlle, and T. De Mulder, “Influence of cross-sectional shape on flow patterns in an open-channel confluence,” in PROCEEDINGS OF THE 36TH IAHR WORLD CONGRESS: DELTAS OF THE FUTURE AND WHAT HAPPENS UPSTREAM , Den Haag, The Netherlands, 2015, pp. 2412–2422.
@inproceedings{6864873,
  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.},
  author       = {Schindfessel, Laurent and Creëlle, Stéphan and De Mulder, Tom},
  booktitle    = {PROCEEDINGS OF THE 36TH IAHR WORLD CONGRESS: DELTAS OF THE FUTURE AND WHAT HAPPENS UPSTREAM },
  isbn         = {978-90-824846-0-1},
  keywords     = {trapezoidal,large-eddy simulation,cross-section,open channel confluence},
  language     = {eng},
  location     = {Den Haag, The Netherlands},
  pages        = {2412--2422},
  publisher    = {E-proceedings},
  title        = {Influence of cross-sectional shape on flow patterns in an open-channel confluence},
  url          = {http://app.iahr2015.info/},
  year         = {2015},
}

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