Liu, Y; Stoesser, T; (2024) Large-scale motion in semi-filled pipes and very narrow open channels at supercritical flow. 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. 103-109). CRC Press: London, UK.

Text Riverflow2022-LIU-A032.pdf - Published Version Access restricted to UCL open access staff until 15 February 2026. Download (519kB)

Abstract

This paper presents results of large-eddy simulations (LES) of supercritical flow in semi-filled pipes and very narrow open channels. The bulk Reynolds number and Froude number are kept the same in both cases (Re=30,100 and Fr=1.28) by matching both the hydraulic radius and bulk velocities in the semi-filled pipe and the very narrow open channel. The open channel cross-sections induce turbulence anisotropy which leads to the formation of secondary currents of significant strength. The presence of secondary currents alters both the mean flow characteristics and the Reynolds stresses distributions. Contribution of the secondary currents to the streamwise flow is negative near the free surface and positive near the walls. The pre-multiplied spectra indicate absence of VLSM in both cases.

Download activity - last month

Export as CSVXMLJSON

Download activity - last 12 months

Export as CSVXMLJSON

Downloads by country - last 12 months

Export as JSONXMLCSV

Archive Staff Only

View Item