Luo, Q;
Stoesser, T;
Jalalabadi, R;
Xie, Z;
(2023)
Hydrodynamics and turbulence of free-surface flow over a backward-facing step.
Journal of Hydraulic Research
, 61
(5)
pp. 611-630.
10.1080/00221686.2023.2239751.
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Abstract
Three large-eddy simulations of open channel flow over a backward-facing step are performed to investigate the effect of submergence on the turbulence, hydrodynamics, and water surface deformation downstream of the step. The deformation of the water surface, the extent of the recirculation zone as well as the strength of the shear layer are a function of relative submergence. All flows downstream of the step exhibit elevated levels of turbulent shear stress and contain significant amounts of turbulent kinetic energy. The instantaneous flow features rollers immediately behind the step and horseshoe-shaped vortices shed from the shear layer, the latter being advected towards the water surface where they cause deformations. It is shown that these vortices can originate from any location along the dividing streamline; however, they contain more energy the closer to the mean attachment location they originate.
| Type: | Article |
|---|---|
| Title: | Hydrodynamics and turbulence of free-surface flow over a backward-facing step |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1080/00221686.2023.2239751 |
| Publisher version: | https://doi.org/10.1080/00221686.2023.2239751 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | Backward-facing step, free surface, large-eddy simulation, relative submergence, turbulence |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10181234 |
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