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Flat vs. curved rigid-lid LES computations of an open-channel confluence

(2019) JOURNAL OF HYDROINFORMATICS. 21(2). p.318-334
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Abstract
This paper describes the application of four Large Eddy Simulations (LES) to an open-channel confluence flow, making use of a frictionless rigid-lid to treat the free-surface. Three simulations are conducted with a flat rigid-lid, at different elevations. A fourth simulation is carried out with a curved rigid-lid which is a closer approximation to the real free-surface of the flow. The curved rigid-lid is obtained from the time-averaged pressure field on the flat rigid-lid from one of the initial three simulations. The aim is to investigate the limitations of the free-surface treatment by means of a rigid-lid in the simulation of an asymmetric confluence, showing the differences that both approaches produce in terms of mean flow, secondary flow and turbulence. After validation with experimental data, the predictions are used to understand the differences between adopting a flat and a curved rigid-lid onto the confluence hydrodynamics. For the present flow case, although it was characterized by a moderately low downstream Froude number (Fr ≈ 0.37), it was found that an oversimplification of the numerical treatment of the free-surface leads to a decreased accuracy of the predictions of the secondary flow and turbulent kinetic energy.
Keywords
3D numerical modelling, Large Eddy Simulation, open-channel flow, right-angled confluence, rigid-lid approximation, subcritical flow

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Citation

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Chicago
Cunha Ramos, Pedro, Laurent Schindfessel, João Pedro Pêgo, and Tom De Mulder. 2019. “Flat Vs. Curved Rigid-lid LES Computations of an Open-channel Confluence.” Journal of Hydroinformatics 21 (2): 318–334.
APA
Cunha Ramos, P., Schindfessel, L., Pêgo, J. P., & De Mulder, T. (2019). Flat vs. curved rigid-lid LES computations of an open-channel confluence. JOURNAL OF HYDROINFORMATICS, 21(2), 318–334.
Vancouver
1.
Cunha Ramos P, Schindfessel L, Pêgo JP, De Mulder T. Flat vs. curved rigid-lid LES computations of an open-channel confluence. JOURNAL OF HYDROINFORMATICS. IWA Publishing; 2019;21(2):318–34.
MLA
Cunha Ramos, Pedro et al. “Flat Vs. Curved Rigid-lid LES Computations of an Open-channel Confluence.” JOURNAL OF HYDROINFORMATICS 21.2 (2019): 318–334. Print.
@article{8610268,
  abstract     = {This paper describes the application of four Large Eddy Simulations (LES) to an open-channel confluence flow, making use of a frictionless rigid-lid to treat the free-surface. Three simulations are conducted with a flat rigid-lid, at different elevations. A fourth simulation is carried out with a curved rigid-lid which is a closer approximation to the real free-surface of the flow. The curved rigid-lid is obtained from the time-averaged pressure field on the flat rigid-lid from one of the initial three simulations. The aim is to investigate the limitations of the free-surface treatment by means of a rigid-lid in the simulation of an asymmetric confluence, showing the differences that both approaches produce in terms of mean flow, secondary flow and turbulence. After validation with experimental data, the predictions are used to understand the differences between adopting a flat and a curved rigid-lid onto the confluence hydrodynamics. For the present flow case, although it was characterized by a moderately low downstream Froude number (Fr \ensuremath{\asymp} 0.37), it was found that an oversimplification of the numerical treatment of the free-surface leads to a decreased accuracy of the predictions of the secondary flow and turbulent kinetic energy.},
  author       = {Cunha Ramos, Pedro and Schindfessel, Laurent and P{\^e}go, Jo{\~a}o Pedro and De Mulder, Tom},
  issn         = {1464-7141},
  journal      = {JOURNAL OF HYDROINFORMATICS},
  language     = {eng},
  number       = {2},
  pages        = {318--334},
  publisher    = {IWA Publishing},
  title        = {Flat vs. curved rigid-lid LES computations of an open-channel confluence},
  url          = {http://dx.doi.org/10.2166/hydro.2019.109},
  volume       = {21},
  year         = {2019},
}

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