Chung, SW;
Luo, Q;
Stoesser, T;
(2024)
Large-scale motion over spanwise heterogeneous bed roughness.
In: Ferreira da Silva, Ana Maria and Rennie, Colin and Gaskin, Susan and Lacey, Jay and MacVicar, Bruce, (eds.)
River Flow 2022 - Proceedings of the 11th Conference on Fluvial Hydraulics.
(pp. pp. 83-89).
CRC Press: London, UK.
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Abstract
This paper presents results of large-eddy simulations (LES) of open-channel flow over a bed with spanwise heterogeneous roughness. The smooth channel bed is roughened via streamwise-orientated triangular strips. The flows reported are at moderate Reynolds and Froude numbers and at varying relative submergence (i.e. water-depth-to-strip-height-ratio). Due to the presence of longitudinal strips, the flow exhibits significantly different mean flow characteristics than the analogue flow over a smooth channel bed. The strip roughness induces turbulence anisotropy which leads to the formation of strong secondary currents, featuring upflow above strips and downflow in the troughs between strips. It is found that the spacing of the strips and the relative submergence of the flow has a profound influence on the strength of secondary currents and the large-scale turbulent motion.
| Type: | Proceedings paper |
|---|---|
| Title: | Large-scale motion over spanwise heterogeneous bed roughness |
| Event: | 11th Conference on Fluvial Hydraulics 2022 |
| ISBN-13: | 9781003323037 |
| DOI: | 10.1201/9781003323037-12 |
| Publisher version: | https://doi.org/10.1201/9781003323037-12 |
| 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. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10199602 |
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