eprintid: 10199602
rev_number: 8
eprint_status: archive
userid: 699
dir: disk0/10/19/96/02
datestamp: 2024-11-05 09:37:45
lastmod: 2024-11-05 09:37:45
status_changed: 2024-11-05 09:37:45
type: proceedings_section
metadata_visibility: show
sword_depositor: 699
creators_name: Chung, SW
creators_name: Luo, Q
creators_name: Stoesser, T
title: Large-scale motion over spanwise heterogeneous bed roughness
ispublished: pub
divisions: UCL
divisions: B04
divisions: F44
note: This version is the author-accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
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.
date: 2024-08-14
date_type: published
publisher: CRC Press
official_url: https://doi.org/10.1201/9781003323037-12
full_text_type: other
language: eng
verified: verified_manual
elements_id: 2311584
doi: 10.1201/9781003323037-12
isbn_13: 9781003323037
lyricists_name: Stoesser, Thorsten
lyricists_id: TSTOE28
actors_name: Stoesser, Thorsten
actors_id: TSTOE28
actors_role: owner
full_text_status: restricted
pres_type: paper
series: Conference on Fluvial Hydraulics
publication: River Flow - Proceedings of the 11th Conference on Fluvial Hydraulics, 2022
volume: 2022
place_of_pub: London, UK
pagerange: 83-89
event_title: 11th Conference on Fluvial Hydraulics 2022
book_title: River Flow 2022 - Proceedings of the 11th Conference on Fluvial Hydraulics
editors_name: Ferreira da Silva, Ana Maria
editors_name: Rennie, Colin
editors_name: Gaskin, Susan
editors_name: Lacey, Jay
editors_name: MacVicar, Bruce
citation:        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.      
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10199602/1/RiverFlow2024_FreeSurface_SChung.pdf