Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Hydrodynamics and turbulence of free-surface flow over a backward-facing step

Luo, Qianyu, Stoesser, Thorsten, Jalalabadi, Razieh and Xie, Zhihua ORCID: https://orcid.org/0000-0002-5180-8427 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
Item availability restricted.

[thumbnail of TJHR-2021-0170.R3_Proof_hi.pdf] PDF - Accepted Post-Print Version
Restricted to Repository staff only until 17 July 2024 due to copyright restrictions.
Available under License Creative Commons Attribution Non-commercial No Derivatives.

Download (25MB)

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.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Advanced Research Computing @ Cardiff (ARCCA)
Engineering
Publisher: Taylor and Francis Group
ISSN: 0022-1686
Funders: EPSRC
Date of First Compliant Deposit: 3 October 2023
Date of Acceptance: 17 July 2023
Last Modified: 11 Jun 2024 16:29
URI: https://orca.cardiff.ac.uk/id/eprint/162574

Actions (repository staff only)

Edit Item Edit Item

Downloads

Downloads per month over past year

View more statistics